APPLE CRAPPLE

This year for RetroChallenge, I think I will focus on some 6502 projects, mostly my Synertek MBC020 ExorBus board. I never got it working co...

A while back I was fortunate enough to spot a CMS 9639A Memory Management Processor as part of a lot of boards in an eBay auction. This boar...

I have seen a lot of overpowered PS/2 keyboard interfaces lately: microcontrollers, bit-banged PIAs, PIAs with shift registers. All sorts of...

I previously hinted at a hardware project I have been working on- an expansion bus adapter for the MC-10 allowing it to use EXORbus peripher...

Day 14: So, I was making good progress doing daily tasks on my MC-10, but lost my momentum after a camping trip. I have been doing minor dev...

Days 7-9 I started working on a BASIC game for the MC-10. Previously, I had been able to use the MC's serial port to "LPRINT" ...

Day 6: I mostly played MC-10 games from Jim Gerrie's TRS-80 MC-10 Files repository . So much stuff in there! Unfortunately Google Drive ...

Day 5: I spent a fair bit of time today downloading and running TRS-80 MC-10 games and utiliites. Unfortunately, the process was rough: d...

Day 4: I found an MC-10 serial terminal program "COMPAC" online and was able to load it onto the MC-10 using my new 'cassette...

Pinout: 3.5mm TRRS plug | | ----- | = (5) MIC + 10K OHM resistor to ground _ | = (2) Signal Ground _ | = (N/C) right EA...

So basically, MC-10 can load from Mac, but can't save cassette/audio output to Mac yet. XRoar is converting file formats for me. H...

BASIC code samples after the break...

Annotated MC-10 Service Manual Here is the transferred BASIC for this post: 10 CLS 20 PRINT "I MADE AN MC-10 SERIAL CABLE TODA...

Between running RetroChallenge and how limited the TRS-80 MC-10 is, a real endurance challenge is not in the cards for me. But I fully inte...

SBCs + Keyboards!! I will figuring out how to interface keyboards with some 6502/6809 SBCs, playing around with PS/2 interfaces, and, if I h...

After figuring out the location of the video output on the MBC020's P4 connector (pin 20), I noticed that the video and ground signals a...

Serial Cable I spent a few minutes continuity testing the P3 card edge connector for the serial port so that I could build a serial cable f...

I recently acquired a Synertek MBC020 EXORbus single board computer, notably sporting a 6512 microprocessor. The 6512 is software compatibl...

It did not take long for me to realize that the virtual address jumper board for my MIKUL 6218 was not a great long-term soloution. It was ...

I received some membrane keypads in the mail today. Unfortunately, I neglected to order the 4x5 Keypads I hoped to use and only ordered 4x4 ...