(This was originally a thread posted on Twitter on June 30, 2022) June 30, 2022 On the bench for recapping today is a Mac Classic II, the last of the b&w compact Macs (1991). I forgot how small the motherboard was.
Category Archives: Retroputing
MJB Cartridge Expander and 80 column card for C64
I’ve had this cartridge expander for a few years and always assumed it was commonly known about and that the ROM inside had been dumped. It seems that may not be the case, so this page is to provide the information I have about it.
Getting Programs For The C64 CP/M Cartridge
The Commodore 64 CP/M cartridge was released sometime in the early 1980’s, shortly after the introduction of the C64 itself. The cartridge contained the necessary Z80 chip inside to run CP/M software natively. While a novel idea, it was a bit too late with the popularity of CP/M waning which itself had been released almost […]
The Jameco JE520 Voice Synthesizer
The latest acquisition is the JE520 by Jameco. This external voice synthesizer came in two variants: the JE520-CM for Commodore and JE520-AP for Apple II. The only difference was the interface connection to the computer. The Commodore version, the one I have, connects to the user port while the Apple II version connects via an […]
Commodore 1520 Plots .SVG Images
NOTE! Split gears causing causing or plot errors? New replacement Alps gears for the Commodore 1520, Atari 1020, etc are now available! Click here to order your set. I’ve put together a quick program that can convert an .SVG file into data statements that can be used to plot it on a Commodore 1520 Printer/Plotter. […]
Reddit/r/RetroBattlestations BASIC Week 3– C64 port
It’s BASIC Week on Reddit/r/RetroBattlestations and I ported the BASIC Week program “Under the Sea” to the Commodore 64. The original code was written by FozzTexx for the IBM PC which allows for variable names longer than two characters. The Commodore 64 BASIC version 2 would probably still work using the longer names, it would […]
3D Visualization on the Commodore 1520
NOTE! Split gears causing plot errors? New replacement Alps gears for the Commodore 1520, Atari 1020, etc are now available! Click here to order your set. Recently on the Lemon64 forum, user Rizthomas posted some excellent scans of some plots that he did on a Commodore 1520 Printer/Plotter back in 1986. The plots were well […]
DIY RS-232 Interface for Commodore C64 for under $15
If you have a Commodore 64, chances are you’ll eventually need to connect a modem or other serial device to it. You’ll find that’s not quite that easy since the C64 doesn’t have a standard RS-232 serial port. What it does have is called the “user port” and it can do serial over this port […]
How to get software to disk for your Commodore 64
It’s a question that pops up from time to time on forums from Lemon64 to Reddit C64. “Yes! I just got a Commodore 64!! Now how do I get disk images onto disk so I can do something?” It’s not straight forward. Folks in the Apple II world have a fantastic program called ADTPro that […]
Reddit r/retrobattlestations Commodore 64 Port
For the next two weeks, it’s BASIC Week 2 at Reddit r/retrobattlestations. You can participate with your Commodore 64 or at least play along with your favorite emulator. I’ve ported the code to the C64 and you can get the code from the thread on Reddit. Or you can download the D64 image here to […]