Changes
/* Technical Specifications */
* Uses I/O Port FFxxh (Write only), ie. only /IORQ, /WR, A15-A8 are decoded. A7..A0 are not decoded, and /RD isn't used, too.
* Port usage: Write 8bit unsigned sample data to Port FFxxh. The D/A converter is mono and has only one channel (mixing multiple channels is to be done by software).
* The Amdrum software uses port FFxxh. The playback routine also scans the keyboard. The lower 8-bits of the I/O port come Where "xx" is garbage coming from the last value of the C register used to scan the Amdrums keyboardscanning routine (see disassembly below).
The five chips on the single-sided PCB are:
