New addition: Datavue 25 portable lunchbox PC. Keyboard stows on front, two 3.5 floppy drives, 13 pounds.<\/p>\n\n\n\n The screen pivots upward out of the case, presumably for a better view. I don\u2019t know yet, it won\u2019t power up. The power supply goes into the battery compartment.<\/p>\n\n\n\n Fuse was blown inside the power supply. I replaced it and it blew again. Nothing looks visibly bad to me. Some slight discoloration (old flux?). Bad cap(s) perhaps.<\/p>\n\n\n\n May 8, 2019<\/strong><\/p>\n\n\n\n A tip from @UpLateGeek<\/a> suggested the bridge rectifier as a starting point. I metered it in circuit and two adjacent pins are shorted in both directions so it may have failed. I have this spare BA20 but can\u2019t find what the marking mean (E5A vs C3G). Thoughts?<\/p>\n\n\n\n May 9, 2019<\/strong><\/p>\n\n\n\n Swapped in the new BA20 bridge rectifier. (One side was bad in the old one.) On the advice of @anachrocomputer<\/a> I also checked the two switching transistors. All pins are shorted together. NTE379 looks to be a replacement for C3159.<\/p>\n\n\n\n May 13, 2019<\/strong><\/p>\n\n\n\n Parts are in for the DataVue 25 power supply. These NTE379 will be stand-ins for the C3159 switching transistors.<\/p>\n\n\n\n Carefully bent the legs, added extra heat sink compound, and screwed them down. Put it all back together and tested. Voltages at 13.3V which I think is OK without a load. But will it power the DataVue 25 portable?<\/p>\n\n\n\n It works! Look at that screen! I don\u2019t think I\u2019ve seen yellow on red of this gas plasma display. Apparently this machine has a built in RAM disk function. Is that common on early DOS machines?<\/p>\n\n\n\n It also includes a resident dumb serial terminal in ROM. A key press brings it up instantly anywhere. That\u2019s going to be really handy to have.<\/p>\n\n\n\n May 15, 2019<\/strong><\/p>\n\n\n\n The DataVue 25 supported an external floppy drive as a \u201cbackpack\u201d add on. Presumably it connected to this 34 pin connector. I assume this supplied power too? No pinout in the manual. It would be great to connect a Gotek floppy emulator here.Any guesses?<\/p>\n\n\n\n Do you have a DataVue 25 or similar lunchbox PC? Let me know in the comments!<\/p>\n\n\n\n <\/p>\n","protected":false},"excerpt":{"rendered":" (This was originally a Twitter thread from May 7, 2019.) May 7, 2019 New addition: Datavue 25 portable lunchbox PC. Keyboard stows on front, two 3.5 floppy drives, 13 pounds.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[66,15],"tags":[116,114,115,117],"_links":{"self":[{"href":"https:\/\/biosrhythm.com\/index.php?rest_route=\/wp\/v2\/posts\/2652"}],"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=2652"}],"version-history":[{"count":1,"href":"https:\/\/biosrhythm.com\/index.php?rest_route=\/wp\/v2\/posts\/2652\/revisions"}],"predecessor-version":[{"id":2677,"href":"https:\/\/biosrhythm.com\/index.php?rest_route=\/wp\/v2\/posts\/2652\/revisions\/2677"}],"wp:attachment":[{"href":"https:\/\/biosrhythm.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2652"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/biosrhythm.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2652"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/biosrhythm.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2652"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"\"](\"https:\/\/biosrhythm.com\/wp-content\/uploads\/2023\/02\/1125947461300658176-D6ArPtvWkAARWHZ.jpg\")
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