APPLE CRAPPLE

I previously documented my ultimately successful attempt to reverse engineer the CMS 9619 Advanced Single Board Computer . The main goal wa...

I recently procured another EXORbus processor board, the MIKUL 6809-5, for a reasonable price. Let's take a look... Notable ICs: Motor...

I finally got it working thanks to the advice of a kind member of the Tandy Color Computer (CoCo) discord channel . Interrupts! Once I conne...

While I was waiting for my RAM to arrived, I tried burning an EEPROM for NitrOS-9 so that I could make the load time shorter and avoid the r...

I have had a little extra time lately since I don't have to commute for a while, so I pulled the CMS boards out of their storage boxes. ...

I have been working on some ideas to expand my CMS 9619 SBC . I thought an SD card interface would be a nice option, but I didn't want t...

With the the power and serial port breakout boards hooked up, I tried turning on the CMS 9619, with no luck- nothing from the serial ports. ...

Continuing my reverse engineering efforts on my CMS 9619 and 9609 SBCs, I downloaded the ROMs that were still in two of the boards. I insert...

I recently came into possession of a CMS 9619A Advanced Single Board Microcomputer. I have been unable to find any authoritative informatio...