A disassembly of it was published in two books. The provided BASIC is a port of Microsoft Extended BASIC for the 6809-based Radio Shack Color Computer. It is powered by USB (taking about 230 mA of current) and you communicate with it using a terminal emulator. The system can plug into a computer's USB port where it shows up as a serial port. Added a 32-pin header with access to most signals, for future expansion and to help with debug.Provided a jumper to select USB or external power source.Added a simple power on reset circuit to the pushbutton reset.I also omitted the optional hardware handshaking circuit. Used a 6-pin connector for a standard FTDI USB to serial breakout board and omitted any RS-232 line driver/receiver circuitry.

I made a few small changes in my version of the board: This would make it easier to make design changes and potentially a printed circuit board (PCB). I entered my own schematic using the EasyEDA web-based CAD software. The design is simple, potentially buildable on a breadboard, and had been reproduced by other people, so I decided to give it a try. The basic specs are a 6809 processor running at just under 2 MHz, 32K of static RAM, 16K of EPROM, and a 6850 ACIA-based serial port. A five or six chip design, it has serial i/o and can run a version of Microsoft BASIC that he adapted from the version in the Radio Shack Color Computer.

I soon came across a Single Board Computer design by Grant Searle. Having completed some retrocomputing projects with the other chips, I start looking for a project where I could play with this CPU for nostalgia purposes. As well as the 6502, 6800, and 68000 chips, another CPU I used early in my career was the Motorola 6809, the more powerful successor to the 6800.

Genius g540 programmer