Motorola Retro 6800 MP-02

While poking around EBay (always a bad thing) I found some mini-SWTPC like boards. Based on the Motorola MC6802. The SWTPC was a computer from the 1970's, the beggining of the home computer era. It wasn't exactly a home computer but it was a very useful computer. Similar boards ended up in things like industrial sewing machines, oven controllers and other industral computer snad controllers. I was introduced to it in my first job as an Electrical Engineer Technician. I had already learned BASIC, Unix, and 6502 assembly langauge. At this job I learned C, Morotola 6800, 6809, and 68000 assembly language. I also helped design, program and repair computers. That was the last time I got to be employed in electronics. I went on to other computer topics. But I always have a love of building adn programming electronics.

Really I have more computers and parts than I will every use. But this was all the the PCBs and I could easily order the parts I didn't have AND I REALLY wanted to build some from start to finish. So I ordered the boards and the parts. Actually I had another goal for this computer. I had recently found Microware's RT68MX (Real Time OS for the MC6800), also found are the A/BASIC compiler and RTEdit. All part of the developemnt in the 1970s. Of course I need a good ROM debugger. While the Mikbug is useful it's pretty basic I need a bit more functionality. I've know about Peter Stark's Humbug since the 80's, I've used it on the PT68K-2 and the Tandy MC10 (6803). I have the source code to Humbug for the 6809 and the68000. I've disassembled the code for the MC10 (and it's a mess but I think recoverable). I also grabbed Peter's Kilobaud articles on Humbug for the 6800. While it's not complete code it's enough to guesstimate the actual code. That's a story. So after 40+ years of not having touch MC600 code I dove in a built the comptuer a Humbug for the 6802 (same assembly code as the 6800).