{"id":2224,"date":"2022-12-18T17:41:02","date_gmt":"2022-12-18T22:41:02","guid":{"rendered":"https:\/\/biosrhythm.com\/?p=2224"},"modified":"2022-12-20T10:08:19","modified_gmt":"2022-12-20T15:08:19","slug":"commodore-pet-2001-repair","status":"publish","type":"post","link":"https:\/\/biosrhythm.com\/?p=2224","title":{"rendered":"Commodore PET 2001 Repair"},"content":{"rendered":"\n<p>(This was originally a Twitter thread from November 6, 2017.)<\/p>\n\n\n\n<p><strong>November 6, 2017<\/strong><\/p>\n\n\n\n<p>A huge box has just arrived! And inside are lots and lots of packing peanuts. Wait, wait, there&#8217;s something else in here. It looks like it&#8217;s from the future.<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-3 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927698918854529027-DN_ZPxmW0AEYha6-800x800.jpg\"><img loading=\"lazy\" width=\"800\" height=\"800\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927698918854529027-DN_ZPxmW0AEYha6-800x800.jpg\" alt=\"\" data-id=\"2225\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2225#main\" class=\"wp-image-2225\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927698918854529027-DN_ZPxmW0AEYha6-800x800.jpg 800w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927698918854529027-DN_ZPxmW0AEYha6-300x300.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927698918854529027-DN_ZPxmW0AEYha6-150x150.jpg 150w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927698918854529027-DN_ZPxmW0AEYha6-768x768.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927698918854529027-DN_ZPxmW0AEYha6.jpg 1200w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927699782138826752-DN_aBw4WAAEGDHV-840x630.jpg\"><img loading=\"lazy\" width=\"840\" height=\"630\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927699782138826752-DN_aBw4WAAEGDHV-840x630.jpg\" alt=\"\" data-id=\"2226\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2226#main\" class=\"wp-image-2226\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927699782138826752-DN_aBw4WAAEGDHV-840x630.jpg 840w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927699782138826752-DN_aBw4WAAEGDHV-300x225.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927699782138826752-DN_aBw4WAAEGDHV-768x576.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927699782138826752-DN_aBw4WAAEGDHV.jpg 1200w\" sizes=\"(max-width: 840px) 100vw, 840px\" \/><\/a><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927700380011687938-DN_ak4YWAAIo8dP.jpg\"><img loading=\"lazy\" width=\"840\" height=\"630\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927700380011687938-DN_ak4YWAAIo8dP-840x630.jpg\" alt=\"\" data-id=\"2227\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927700380011687938-DN_ak4YWAAIo8dP.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2227#main\" class=\"wp-image-2227\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927700380011687938-DN_ak4YWAAIo8dP-840x630.jpg 840w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927700380011687938-DN_ak4YWAAIo8dP-300x225.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927700380011687938-DN_ak4YWAAIo8dP-768x576.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927700380011687938-DN_ak4YWAAIo8dP.jpg 1024w\" sizes=\"(max-width: 840px) 100vw, 840px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p>Say 10 PRINT\u201dHELLO WORLD\u201d to the Commodore PET 2001 from 1977, one of the \u201ctrinity\u201d personal computers. Big thanks to <a href=\"https:\/\/twitter.com\/FozzTexx\">@FozzTexx<\/a>!<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-1 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927702729123917825-DN_ctl1X4AE1p70.jpg\"><img loading=\"lazy\" width=\"600\" height=\"800\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927702729123917825-DN_ctl1X4AE1p70-600x800.jpg\" alt=\"\" data-id=\"2228\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927702729123917825-DN_ctl1X4AE1p70.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2228#main\" class=\"wp-image-2228\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927702729123917825-DN_ctl1X4AE1p70-600x800.jpg 600w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927702729123917825-DN_ctl1X4AE1p70-225x300.jpg 225w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927702729123917825-DN_ctl1X4AE1p70.jpg 768w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<!--more-->\n\n\n\n<p>The PET aesthetic is filing cabinet crossed with calculator crossed with Kubrick. It\u2019s no mistake and it\u2019s terrific.<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-4 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927712637579907072-DN_luDVW4AE72dA.jpg\"><img loading=\"lazy\" width=\"501\" height=\"800\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927712637579907072-DN_luDVW4AE72dA-501x800.jpg\" alt=\"\" data-id=\"2232\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927712637579907072-DN_luDVW4AE72dA.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2232#main\" class=\"wp-image-2232\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927712637579907072-DN_luDVW4AE72dA-501x800.jpg 501w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927712637579907072-DN_luDVW4AE72dA-188x300.jpg 188w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927712637579907072-DN_luDVW4AE72dA.jpg 751w\" sizes=\"(max-width: 501px) 100vw, 501px\" \/><\/a><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927712637579907072-DN_luDRXcAAGedk.jpg\"><img loading=\"lazy\" width=\"840\" height=\"312\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927712637579907072-DN_luDRXcAAGedk-840x312.jpg\" alt=\"\" data-id=\"2229\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927712637579907072-DN_luDRXcAAGedk.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2229#main\" class=\"wp-image-2229\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927712637579907072-DN_luDRXcAAGedk-840x312.jpg 840w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927712637579907072-DN_luDRXcAAGedk-300x111.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927712637579907072-DN_luDRXcAAGedk-768x285.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927712637579907072-DN_luDRXcAAGedk.jpg 1200w\" sizes=\"(max-width: 840px) 100vw, 840px\" \/><\/a><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927712637579907072-DN_luDSXcAAU5V_.jpg\"><img loading=\"lazy\" width=\"800\" height=\"800\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927712637579907072-DN_luDSXcAAU5V_-800x800.jpg\" alt=\"\" data-id=\"2231\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927712637579907072-DN_luDSXcAAU5V_.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2231#main\" class=\"wp-image-2231\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927712637579907072-DN_luDSXcAAU5V_-800x800.jpg 800w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927712637579907072-DN_luDSXcAAU5V_-300x300.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927712637579907072-DN_luDSXcAAU5V_-150x150.jpg 150w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927712637579907072-DN_luDSXcAAU5V_-768x768.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927712637579907072-DN_luDSXcAAU5V_.jpg 1200w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927712637579907072-DN_luDSWAAU_vJr.jpg\"><img loading=\"lazy\" width=\"600\" height=\"800\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927712637579907072-DN_luDSWAAU_vJr-600x800.jpg\" alt=\"\" data-id=\"2230\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927712637579907072-DN_luDSWAAU_vJr.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2230#main\" class=\"wp-image-2230\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927712637579907072-DN_luDSWAAU_vJr-600x800.jpg 600w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927712637579907072-DN_luDSWAAU_vJr-225x300.jpg 225w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927712637579907072-DN_luDSWAAU_vJr-768x1024.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/927712637579907072-DN_luDSWAAU_vJr.jpg 900w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p><strong>November 9, 2017<\/strong><\/p>\n\n\n\n<p>Slowly starting to fix and restore this PET 2001. First, some light cleaning of the keyboard, before\/after.<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-1 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928814921948811266-DOPQPe5XUAImwGy.jpg\"><img loading=\"lazy\" width=\"800\" height=\"800\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928814921948811266-DOPQPe5XUAImwGy-800x800.jpg\" alt=\"\" data-id=\"2233\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928814921948811266-DOPQPe5XUAImwGy.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2233#main\" class=\"wp-image-2233\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928814921948811266-DOPQPe5XUAImwGy-800x800.jpg 800w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928814921948811266-DOPQPe5XUAImwGy-300x300.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928814921948811266-DOPQPe5XUAImwGy-150x150.jpg 150w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928814921948811266-DOPQPe5XUAImwGy-768x768.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928814921948811266-DOPQPe5XUAImwGy.jpg 1200w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p>I also installed the two missing 74177 ICs and get video briefly, before it goes away. I think this might mean bad main ROM or RAM.<\/p>\n\n\n\n<figure class=\"wp-block-video\"><video controls src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928815300295962624-DOPQlEOWkAARFE9.mp4\"><\/video><\/figure>\n\n\n\n<p>Powered it on again, now the garbage stays for about 20 seconds then mostly clears. The display ROM at least looks good.<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-2 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928819736569372672-DOPUnrAWsAAP_Np.jpg\"><img loading=\"lazy\" width=\"840\" height=\"630\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928819736569372672-DOPUnrAWsAAP_Np-840x630.jpg\" alt=\"\" data-id=\"2236\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928819736569372672-DOPUnrAWsAAP_Np.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2236#main\" class=\"wp-image-2236\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928819736569372672-DOPUnrAWsAAP_Np-840x630.jpg 840w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928819736569372672-DOPUnrAWsAAP_Np-300x225.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928819736569372672-DOPUnrAWsAAP_Np-768x576.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928819736569372672-DOPUnrAWsAAP_Np.jpg 1200w\" sizes=\"(max-width: 840px) 100vw, 840px\" \/><\/a><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928819736569372672-DOPUnrAW0AAiHmu.jpg\"><img loading=\"lazy\" width=\"840\" height=\"630\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928819736569372672-DOPUnrAW0AAiHmu-840x630.jpg\" alt=\"\" data-id=\"2235\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928819736569372672-DOPUnrAW0AAiHmu.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2235#main\" class=\"wp-image-2235\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928819736569372672-DOPUnrAW0AAiHmu-840x630.jpg 840w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928819736569372672-DOPUnrAW0AAiHmu-300x225.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928819736569372672-DOPUnrAW0AAiHmu-768x576.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928819736569372672-DOPUnrAW0AAiHmu.jpg 1200w\" sizes=\"(max-width: 840px) 100vw, 840px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p>Interesting IR heat signatures from the PET RAM and ROM sections. ROM H1 and H4 are cool as are RAM J3 and I8.<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-1 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928825018183712769-DOPZbPWW4AEoAOp.jpg\"><img loading=\"lazy\" width=\"800\" height=\"800\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928825018183712769-DOPZbPWW4AEoAOp-800x800.jpg\" alt=\"\" data-id=\"2237\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928825018183712769-DOPZbPWW4AEoAOp.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2237#main\" class=\"wp-image-2237\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928825018183712769-DOPZbPWW4AEoAOp-800x800.jpg 800w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928825018183712769-DOPZbPWW4AEoAOp-300x300.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928825018183712769-DOPZbPWW4AEoAOp-150x150.jpg 150w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928825018183712769-DOPZbPWW4AEoAOp-768x768.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/928825018183712769-DOPZbPWW4AEoAOp.jpg 1200w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p><strong>November 11, 2017<\/strong><\/p>\n\n\n\n<p>This PET has the original 6540 ROM\/6550 RAM modules. They&#8217;re prone to failure, run very hot, and are very rare to procure. The ICs and sockets in the PET are corroded. <a rel=\"noreferrer noopener\" href=\"http:\/\/www.dasarodesigns.com\/projects\/troubleshooting-common-problems-with-the-commodore-pet-2001\/\" target=\"_blank\">This blog recommends DeoxIT<\/a>. Has anyone used DeoxIT or have other recommendations?<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-1 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/929546148892889089-DOZpSiMWkAA-2uH.jpg\"><img loading=\"lazy\" width=\"840\" height=\"630\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/929546148892889089-DOZpSiMWkAA-2uH-840x630.jpg\" alt=\"\" data-id=\"2238\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/929546148892889089-DOZpSiMWkAA-2uH.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2238#main\" class=\"wp-image-2238\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/929546148892889089-DOZpSiMWkAA-2uH-840x630.jpg 840w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/929546148892889089-DOZpSiMWkAA-2uH-300x225.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/929546148892889089-DOZpSiMWkAA-2uH-768x576.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/929546148892889089-DOZpSiMWkAA-2uH.jpg 1200w\" sizes=\"(max-width: 840px) 100vw, 840px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p><strong>November 13, 2017<\/strong><\/p>\n\n\n\n<p>Received <a href=\"https:\/\/twitter.com\/tynemouthsw\">@tynemouthsw<\/a>\u2019s <a href=\"https:\/\/www.thefuturewas8bit.com\/petromram.html\" target=\"_blank\" rel=\"noreferrer noopener\">PET ROM\/RAM board<\/a> today. Rather than try to use the original ROM and RAM chips, I removed all original 6540 ROM\/6550 RAM from my PET 2001 and installed the board in the 6502 socket. This board replaces all RAM and ROM chips with it&#8217;s own on board set. Further, it includes a multi-ROM switcher. The machine will draw less power and run much cooler. I removed the old RAM and ROM chips and stored them away for now.<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-1 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930235079263162368-DOjb34xWkAIuzLi.jpg\"><img loading=\"lazy\" width=\"600\" height=\"800\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930235079263162368-DOjb34xWkAIuzLi-600x800.jpg\" alt=\"\" data-id=\"2239\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930235079263162368-DOjb34xWkAIuzLi.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2239#main\" class=\"wp-image-2239\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930235079263162368-DOjb34xWkAIuzLi-600x800.jpg 600w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930235079263162368-DOjb34xWkAIuzLi-225x300.jpg 225w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930235079263162368-DOjb34xWkAIuzLi.jpg 768w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p>But now that it\u2019s working, time for some Space Invaders\u2014 PET 2001 style!<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-2 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930255544916561921-DOjuey3XUAETDJk.jpg\"><img loading=\"lazy\" width=\"840\" height=\"630\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930255544916561921-DOjuey3XUAETDJk-840x630.jpg\" alt=\"\" data-id=\"2240\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930255544916561921-DOjuey3XUAETDJk.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2240#main\" class=\"wp-image-2240\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930255544916561921-DOjuey3XUAETDJk-840x630.jpg 840w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930255544916561921-DOjuey3XUAETDJk-300x225.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930255544916561921-DOjuey3XUAETDJk-768x576.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930255544916561921-DOjuey3XUAETDJk.jpg 1200w\" sizes=\"(max-width: 840px) 100vw, 840px\" \/><\/a><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930255544916561921-DOjuey7WkAEmgq9.jpg\"><img loading=\"lazy\" width=\"600\" height=\"800\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930255544916561921-DOjuey7WkAEmgq9-600x800.jpg\" alt=\"\" data-id=\"2241\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930255544916561921-DOjuey7WkAEmgq9.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2241#main\" class=\"wp-image-2241\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930255544916561921-DOjuey7WkAEmgq9-600x800.jpg 600w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930255544916561921-DOjuey7WkAEmgq9-225x300.jpg 225w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930255544916561921-DOjuey7WkAEmgq9-768x1024.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930255544916561921-DOjuey7WkAEmgq9.jpg 900w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p>Internal tape drive runs but won\u2019t load so this period matching external datasette is a good stand-in for the PET.<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-1 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930259994234228736-DOjyiDFX0AIGR1R.jpg\"><img loading=\"lazy\" width=\"840\" height=\"630\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930259994234228736-DOjyiDFX0AIGR1R-840x630.jpg\" alt=\"\" data-id=\"2242\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930259994234228736-DOjyiDFX0AIGR1R.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2242#main\" class=\"wp-image-2242\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930259994234228736-DOjyiDFX0AIGR1R-840x630.jpg 840w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930259994234228736-DOjyiDFX0AIGR1R-300x225.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930259994234228736-DOjyiDFX0AIGR1R-768x576.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930259994234228736-DOjyiDFX0AIGR1R.jpg 1024w\" sizes=\"(max-width: 840px) 100vw, 840px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p>Always remember: Use genuine Commodore cassettes in your PET\u2019s datasette! \ud83d\ude00<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-1 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930272866788167680-DOj-PT_WAAESzVR.jpg\"><img loading=\"lazy\" width=\"768\" height=\"1024\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930272866788167680-DOj-PT_WAAESzVR.jpg\" alt=\"\" data-id=\"2243\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930272866788167680-DOj-PT_WAAESzVR.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2243#main\" class=\"wp-image-2243\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930272866788167680-DOj-PT_WAAESzVR.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930272866788167680-DOj-PT_WAAESzVR-225x300.jpg 225w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930272866788167680-DOj-PT_WAAESzVR-600x800.jpg 600w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p><strong>November 14, 2017<\/strong><\/p>\n\n\n\n<p>Tried the PET internal tape deck on port 2 and still doesn\u2019t work. Plugged in known working deck to port 1\u2013 I get weird video artifacts that seem to correlate to tape audio. Screen then blanks.<\/p>\n\n\n\n<figure class=\"wp-block-video\"><video controls src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/930610503763849216-A5_iwDJ6AZK_jWcm.mp4\"><\/video><\/figure>\n\n\n\n<p><strong>November 16, 2017<\/strong><\/p>\n\n\n\n<p>Today the PET only boots to random chars. I think BASIC is running because repeatedly hitting shift\/run stop makes the screen flicker like something is being written to it. Ideas?<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-1 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931298702542729216-DOyjO0cX0AIFHjb.jpg\"><img loading=\"lazy\" width=\"840\" height=\"630\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931298702542729216-DOyjO0cX0AIFHjb-840x630.jpg\" alt=\"\" data-id=\"2245\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931298702542729216-DOyjO0cX0AIFHjb.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2245#main\" class=\"wp-image-2245\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931298702542729216-DOyjO0cX0AIFHjb-840x630.jpg 840w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931298702542729216-DOyjO0cX0AIFHjb-300x225.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931298702542729216-DOyjO0cX0AIFHjb-768x576.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931298702542729216-DOyjO0cX0AIFHjb.jpg 1024w\" sizes=\"(max-width: 840px) 100vw, 840px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p>With the help of <a href=\"https:\/\/twitter.com\/ChartreuseK\">@ChartreuseK<\/a>, narrowed it down to a bad 74LS157 at D2 on the PET. Desoldered the chip and putting in a socket.<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-3 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931573536145182720-DO2dL6XX0AA41VJ-840x630.jpg\"><img loading=\"lazy\" width=\"840\" height=\"630\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931573536145182720-DO2dL6XX0AA41VJ-840x630.jpg\" alt=\"\" data-id=\"2246\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2246#main\" class=\"wp-image-2246\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931573536145182720-DO2dL6XX0AA41VJ-840x630.jpg 840w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931573536145182720-DO2dL6XX0AA41VJ-300x225.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931573536145182720-DO2dL6XX0AA41VJ-768x576.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931573536145182720-DO2dL6XX0AA41VJ.jpg 1200w\" sizes=\"(max-width: 840px) 100vw, 840px\" \/><\/a><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931573536145182720-DO2dL6ZWsAUx3Wo.jpg\"><img loading=\"lazy\" width=\"840\" height=\"630\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931573536145182720-DO2dL6ZWsAUx3Wo-840x630.jpg\" alt=\"\" data-id=\"2249\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931573536145182720-DO2dL6ZWsAUx3Wo.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2249#main\" class=\"wp-image-2249\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931573536145182720-DO2dL6ZWsAUx3Wo-840x630.jpg 840w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931573536145182720-DO2dL6ZWsAUx3Wo-300x225.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931573536145182720-DO2dL6ZWsAUx3Wo-768x576.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931573536145182720-DO2dL6ZWsAUx3Wo.jpg 1200w\" sizes=\"(max-width: 840px) 100vw, 840px\" \/><\/a><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931573536145182720-DO2dL6ZWkAEWMz6.jpg\"><img loading=\"lazy\" width=\"840\" height=\"630\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931573536145182720-DO2dL6ZWkAEWMz6-840x630.jpg\" alt=\"\" data-id=\"2248\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931573536145182720-DO2dL6ZWkAEWMz6.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2248#main\" class=\"wp-image-2248\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931573536145182720-DO2dL6ZWkAEWMz6-840x630.jpg 840w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931573536145182720-DO2dL6ZWkAEWMz6-300x225.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931573536145182720-DO2dL6ZWkAEWMz6-768x576.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931573536145182720-DO2dL6ZWkAEWMz6.jpg 1200w\" sizes=\"(max-width: 840px) 100vw, 840px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p>The Commodore PET 2001 is alive again!<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-1 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931574299663765505-DO2d4ryWkAA9DJe.jpg\"><img loading=\"lazy\" width=\"840\" height=\"630\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931574299663765505-DO2d4ryWkAA9DJe-840x630.jpg\" alt=\"\" data-id=\"2247\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931574299663765505-DO2d4ryWkAA9DJe.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2247#main\" class=\"wp-image-2247\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931574299663765505-DO2d4ryWkAA9DJe-840x630.jpg 840w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931574299663765505-DO2d4ryWkAA9DJe-300x225.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931574299663765505-DO2d4ryWkAA9DJe-768x576.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931574299663765505-DO2d4ryWkAA9DJe.jpg 1024w\" sizes=\"(max-width: 840px) 100vw, 840px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p>I also want to thank <a href=\"https:\/\/twitter.com\/tynemouthsw\">@tynemouthsw<\/a> for the excellent <a href=\"https:\/\/www.thefuturewas8bit.com\/petromram.html\" target=\"_blank\" rel=\"noreferrer noopener\">PET RAM\/ROM board<\/a> which is giving this 2001-8 a second chance and for the sage advice.<\/p>\n\n\n\n<p><strong>November 18, 2017<\/strong><\/p>\n\n\n\n<p>Returning back to PET tape 1 not working and giving lines in video. 6520 at G8 pin 40 (tape 1 read) is next to pin 39 (blank tv). Scoping pin 39 reveals matching tape pulses making the screen blank briefly. Pins bridged internally? Need a new 6520.<\/p>\n\n\n\n<figure class=\"wp-block-video\"><video controls src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931924340970487809-ckRe-FI-WDCoq2nj.mp4\"><\/video><\/figure>\n\n\n\n<p>It looks like <a href=\"https:\/\/twitter.com\/MouserElec\">@MouserElec<\/a> is out of stock of the W65C21N6TPG-14 :-\/ But I do have two 6821 chips for which the 6520 was a direct replacement. It should work the other way round, right? Pinouts looks the same. Thoughts?<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-1 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931930863507517440-DO7iLbrXkAEZZMQ.jpg\"><img loading=\"lazy\" width=\"840\" height=\"630\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931930863507517440-DO7iLbrXkAEZZMQ-840x630.jpg\" alt=\"\" data-id=\"2251\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931930863507517440-DO7iLbrXkAEZZMQ.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2251#main\" class=\"wp-image-2251\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931930863507517440-DO7iLbrXkAEZZMQ-840x630.jpg 840w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931930863507517440-DO7iLbrXkAEZZMQ-300x225.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931930863507517440-DO7iLbrXkAEZZMQ-768x576.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931930863507517440-DO7iLbrXkAEZZMQ.jpg 1024w\" sizes=\"(max-width: 840px) 100vw, 840px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p>Gave it a shot and the 6821 works as a stand-in for the broken 6520. Tape 1 port loads now and no lines in the screen. Next, test an actual datasette.<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-2 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931942663171072001-DO7s6JYWkAAhzZE.jpg\"><img loading=\"lazy\" width=\"840\" height=\"630\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931942663171072001-DO7s6JYWkAAhzZE-840x630.jpg\" alt=\"\" data-id=\"2252\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931942663171072001-DO7s6JYWkAAhzZE.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2252#main\" class=\"wp-image-2252\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931942663171072001-DO7s6JYWkAAhzZE-840x630.jpg 840w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931942663171072001-DO7s6JYWkAAhzZE-300x225.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931942663171072001-DO7s6JYWkAAhzZE-768x576.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931942663171072001-DO7s6JYWkAAhzZE.jpg 1200w\" sizes=\"(max-width: 840px) 100vw, 840px\" \/><\/a><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931942663171072001-DO7s6KCWkAEycqc.jpg\"><img loading=\"lazy\" width=\"840\" height=\"630\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931942663171072001-DO7s6KCWkAEycqc-840x630.jpg\" alt=\"\" data-id=\"2253\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931942663171072001-DO7s6KCWkAEycqc.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2253#main\" class=\"wp-image-2253\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931942663171072001-DO7s6KCWkAEycqc-840x630.jpg 840w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931942663171072001-DO7s6KCWkAEycqc-300x225.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931942663171072001-DO7s6KCWkAEycqc-768x576.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931942663171072001-DO7s6KCWkAEycqc.jpg 1200w\" sizes=\"(max-width: 840px) 100vw, 840px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p>Datasette seems like it doesn\u2019t get motor power on tape 1 port.<\/p>\n\n\n\n<p>Comparing port 1 to port 2, I\u2019ve located a transistor Q5 that doesn\u2019t seem to be switching anymore.<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-1 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931975489945776129-DO8KxC0X0AEUCOr.jpg\"><img loading=\"lazy\" width=\"840\" height=\"473\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931975489945776129-DO8KxC0X0AEUCOr-840x473.jpg\" alt=\"\" data-id=\"2254\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931975489945776129-DO8KxC0X0AEUCOr.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2254#main\" class=\"wp-image-2254\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931975489945776129-DO8KxC0X0AEUCOr-840x473.jpg 840w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931975489945776129-DO8KxC0X0AEUCOr-300x169.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931975489945776129-DO8KxC0X0AEUCOr-768x432.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931975489945776129-DO8KxC0X0AEUCOr-646x363.jpg 646w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931975489945776129-DO8KxC0X0AEUCOr.jpg 1200w\" sizes=\"(max-width: 840px) 100vw, 840px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p>Q5 is a 2N4401 NPN. I\u2019ve removed it and tested it. I don\u2019t think it\u2019s supposed to be a diode.<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-1 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931976606830252032-DO8Lx5rXUAENkk1.jpg\"><img loading=\"lazy\" width=\"840\" height=\"630\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931976606830252032-DO8Lx5rXUAENkk1-840x630.jpg\" alt=\"\" data-id=\"2255\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931976606830252032-DO8Lx5rXUAENkk1.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2255#main\" class=\"wp-image-2255\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931976606830252032-DO8Lx5rXUAENkk1-840x630.jpg 840w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931976606830252032-DO8Lx5rXUAENkk1-300x225.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931976606830252032-DO8Lx5rXUAENkk1-768x576.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931976606830252032-DO8Lx5rXUAENkk1.jpg 1200w\" sizes=\"(max-width: 840px) 100vw, 840px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p>I\u2019ve replaced the 2N4401 with 2N3904 before so I\u2019ve done that here too. And the datasette has motor power again!<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-1 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931978610675765248-DO8NmsgW0AAuXEU.jpg\"><img loading=\"lazy\" width=\"840\" height=\"630\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931978610675765248-DO8NmsgW0AAuXEU-840x630.jpg\" alt=\"\" data-id=\"2256\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931978610675765248-DO8NmsgW0AAuXEU.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2256#main\" class=\"wp-image-2256\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931978610675765248-DO8NmsgW0AAuXEU-840x630.jpg 840w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931978610675765248-DO8NmsgW0AAuXEU-300x225.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931978610675765248-DO8NmsgW0AAuXEU-768x576.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/931978610675765248-DO8NmsgW0AAuXEU.jpg 1024w\" sizes=\"(max-width: 840px) 100vw, 840px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p>Aaaaand it\u2019s gone. No motor power again. Transistors in the section get hot quickly after power on.<\/p>\n\n\n\n<p>Removed the 2N3904 transistor I just put in and tested it. It\u2019s now a resistor\u2014 something else is up.<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-1 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932030149016645632-DO88eg8WsAURI-9.jpg\"><img loading=\"lazy\" width=\"840\" height=\"630\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932030149016645632-DO88eg8WsAURI-9-840x630.jpg\" alt=\"\" data-id=\"2257\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932030149016645632-DO88eg8WsAURI-9.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2257#main\" class=\"wp-image-2257\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932030149016645632-DO88eg8WsAURI-9-840x630.jpg 840w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932030149016645632-DO88eg8WsAURI-9-300x225.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932030149016645632-DO88eg8WsAURI-9-768x576.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932030149016645632-DO88eg8WsAURI-9.jpg 1200w\" sizes=\"(max-width: 840px) 100vw, 840px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p><a href=\"https:\/\/twitter.com\/tynemouthsw\">@tynemouthsw<\/a> mentioned the TIP29 as possibly failing so I removed it and tested it. Is this right?<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-1 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932031037609332742-DO89SNmX4AAP7U4.jpg\"><img loading=\"lazy\" width=\"840\" height=\"630\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932031037609332742-DO89SNmX4AAP7U4-840x630.jpg\" alt=\"\" data-id=\"2258\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932031037609332742-DO89SNmX4AAP7U4.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2258#main\" class=\"wp-image-2258\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932031037609332742-DO89SNmX4AAP7U4-840x630.jpg 840w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932031037609332742-DO89SNmX4AAP7U4-300x225.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932031037609332742-DO89SNmX4AAP7U4-768x576.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932031037609332742-DO89SNmX4AAP7U4.jpg 1200w\" sizes=\"(max-width: 840px) 100vw, 840px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p>Replaced Q4 and Q5. Switched it on and was able to load a game of Space Invaders from tape. IR camera showed minimal heat. Hope it holds up!<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-1 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932064253938470913-DO9bfwNXkAA6nDD.jpg\"><img loading=\"lazy\" width=\"840\" height=\"630\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932064253938470913-DO9bfwNXkAA6nDD-840x630.jpg\" alt=\"\" data-id=\"2259\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932064253938470913-DO9bfwNXkAA6nDD.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2259#main\" class=\"wp-image-2259\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932064253938470913-DO9bfwNXkAA6nDD-840x630.jpg 840w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932064253938470913-DO9bfwNXkAA6nDD-300x225.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932064253938470913-DO9bfwNXkAA6nDD-768x576.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932064253938470913-DO9bfwNXkAA6nDD.jpg 1024w\" sizes=\"(max-width: 840px) 100vw, 840px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p>I plugged in the original internal datasette, pressed play and the temperature on the TIP29 started increasing rapidly. That may be the culprit.<\/p>\n\n\n\n<p>Found the motor power problem in the datasette. That tiny strand of wire was grounding the motor wire. Now to figure it why it won\u2019t load.<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-1 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932108955467337728-DO-EJvPWkAAELYy-1.jpg\"><img loading=\"lazy\" width=\"800\" height=\"800\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932108955467337728-DO-EJvPWkAAELYy-1-800x800.jpg\" alt=\"\" data-id=\"2453\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932108955467337728-DO-EJvPWkAAELYy-1.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2453#main\" class=\"wp-image-2453\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932108955467337728-DO-EJvPWkAAELYy-1-800x800.jpg 800w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932108955467337728-DO-EJvPWkAAELYy-1-300x300.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932108955467337728-DO-EJvPWkAAELYy-1-150x150.jpg 150w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932108955467337728-DO-EJvPWkAAELYy-1-768x768.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932108955467337728-DO-EJvPWkAAELYy-1.jpg 1024w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p><strong>November 19, 2017<\/strong><\/p>\n\n\n\n<p>Back to the PET\u2019s internal datasette. Won\u2019t load\/read, but will save\/write to tape which can be read in another working deck. Think I need to scope around.<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-1 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932284364796387329-DPAjr5VX0AE6lZ2.jpg\"><img loading=\"lazy\" width=\"840\" height=\"630\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932284364796387329-DPAjr5VX0AE6lZ2-840x630.jpg\" alt=\"\" data-id=\"2261\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932284364796387329-DPAjr5VX0AE6lZ2.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2261#main\" class=\"wp-image-2261\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932284364796387329-DPAjr5VX0AE6lZ2-840x630.jpg 840w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932284364796387329-DPAjr5VX0AE6lZ2-300x225.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932284364796387329-DPAjr5VX0AE6lZ2-768x576.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932284364796387329-DPAjr5VX0AE6lZ2.jpg 1024w\" sizes=\"(max-width: 840px) 100vw, 840px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p>I did clean the tape read head. It looks worn to me\u2014 or is it still dirty?<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-1 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932285881335078916-DPAlEK4XcAEdExs.jpg\"><img loading=\"lazy\" width=\"840\" height=\"630\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932285881335078916-DPAlEK4XcAEdExs-840x630.jpg\" alt=\"\" data-id=\"2262\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932285881335078916-DPAlEK4XcAEdExs.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2262#main\" class=\"wp-image-2262\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932285881335078916-DPAlEK4XcAEdExs-840x630.jpg 840w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932285881335078916-DPAlEK4XcAEdExs-300x225.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932285881335078916-DPAlEK4XcAEdExs-768x576.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932285881335078916-DPAlEK4XcAEdExs.jpg 1024w\" sizes=\"(max-width: 840px) 100vw, 840px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p>Since the tape head does both read and write and this deck saved something that another deck could read, I think I need to focus on the deck\u2019s circuit board next.<\/p>\n\n\n\n<p>I usually think circuitry is the fault\u2014 but it was mechanical. The large 18 pin play\/record switch (marked in red on the pictures below) was dirty. Some DeoxIT and lots of presses on the play and record buttons to exercise the switch fixed it.<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-2 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932360368827092992-DPBozzkW4AE1-rt.jpg\"><img loading=\"lazy\" width=\"599\" height=\"800\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932360368827092992-DPBozzkW4AE1-rt-599x800.jpg\" alt=\"\" data-id=\"2263\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932360368827092992-DPBozzkW4AE1-rt.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2263#main\" class=\"wp-image-2263\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932360368827092992-DPBozzkW4AE1-rt-599x800.jpg 599w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932360368827092992-DPBozzkW4AE1-rt-225x300.jpg 225w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932360368827092992-DPBozzkW4AE1-rt-768x1025.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932360368827092992-DPBozzkW4AE1-rt.jpg 899w\" sizes=\"(max-width: 599px) 100vw, 599px\" \/><\/a><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932360368827092992-DPBozzoWAAAFH6U.jpg\"><img loading=\"lazy\" width=\"840\" height=\"629\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932360368827092992-DPBozzoWAAAFH6U-840x629.jpg\" alt=\"\" data-id=\"2264\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932360368827092992-DPBozzoWAAAFH6U.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2264#main\" class=\"wp-image-2264\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932360368827092992-DPBozzoWAAAFH6U-840x629.jpg 840w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932360368827092992-DPBozzoWAAAFH6U-300x225.jpg 300w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932360368827092992-DPBozzoWAAAFH6U-768x575.jpg 768w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932360368827092992-DPBozzoWAAAFH6U.jpg 1200w\" sizes=\"(max-width: 840px) 100vw, 840px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p>The Commodore PET 2001 datasette loads (and saves) again!<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" width=\"320\" height=\"320\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/Commodore-Datasette.gif\" alt=\"\" class=\"wp-image-2266\"\/><\/figure>\n\n\n\n<p>Ordered a <a rel=\"noreferrer noopener\" href=\"https:\/\/amzn.to\/3FEAnyB\" target=\"_blank\">Bluetooth cassette adapter<\/a> like this one to wirelessly &#8220;play&#8221; .TAP files to the Commodore PET 2001 datasette.<\/p>\n\n\n\n<p><strong>November 20, 2017<\/strong><\/p>\n\n\n\n<p>The doctor is in. Who remembers ELIZA?<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-1 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932801983949475840-DPH6dTcXcAAzl59.jpg\"><img loading=\"lazy\" width=\"600\" height=\"800\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932801983949475840-DPH6dTcXcAAzl59-600x800.jpg\" alt=\"\" data-id=\"2267\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932801983949475840-DPH6dTcXcAAzl59.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2267#main\" class=\"wp-image-2267\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932801983949475840-DPH6dTcXcAAzl59-600x800.jpg 600w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932801983949475840-DPH6dTcXcAAzl59-225x300.jpg 225w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932801983949475840-DPH6dTcXcAAzl59.jpg 768w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p><strong>November 21, 2017<\/strong><\/p>\n\n\n\n<p>More DeoxIT was needed on the r\/w switch and new capacitors, the tape deck is working. Again. Loading games from .TAP files and saving to real tape.<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-1 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932836670419894273-DPIaAYXXkAAoKXl.jpg\"><img loading=\"lazy\" width=\"600\" height=\"800\" src=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932836670419894273-DPIaAYXXkAAoKXl-600x800.jpg\" alt=\"\" data-id=\"2268\" data-full-url=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932836670419894273-DPIaAYXXkAAoKXl.jpg\" data-link=\"https:\/\/biosrhythm.com\/?attachment_id=2268#main\" class=\"wp-image-2268\" srcset=\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932836670419894273-DPIaAYXXkAAoKXl-600x800.jpg 600w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932836670419894273-DPIaAYXXkAAoKXl-225x300.jpg 225w, https:\/\/biosrhythm.com\/wp-content\/uploads\/2022\/12\/932836670419894273-DPIaAYXXkAAoKXl.jpg 768w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p>Do you have a Commodore 2001 PET? Having issues or just having fun? Let me know in the comments.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>(This was originally a Twitter thread from November 6, 2017.) November 6, 2017 A huge box has just arrived! And inside are lots and lots of packing peanuts. Wait, wait, there&#8217;s something else in here. It looks like it&#8217;s from the future. Say 10 PRINT\u201dHELLO WORLD\u201d to the Commodore PET 2001 from 1977, one of [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[84,66,15,1],"tags":[85,88,86,87,52,44,51,50],"_links":{"self":[{"href":"https:\/\/biosrhythm.com\/index.php?rest_route=\/wp\/v2\/posts\/2224"}],"collection":[{"href":"https:\/\/biosrhythm.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/biosrhythm.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/biosrhythm.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/biosrhythm.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2224"}],"version-history":[{"count":10,"href":"https:\/\/biosrhythm.com\/index.php?rest_route=\/wp\/v2\/posts\/2224\/revisions"}],"predecessor-version":[{"id":2454,"href":"https:\/\/biosrhythm.com\/index.php?rest_route=\/wp\/v2\/posts\/2224\/revisions\/2454"}],"wp:attachment":[{"href":"https:\/\/biosrhythm.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2224"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/biosrhythm.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2224"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/biosrhythm.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2224"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}