S/O/S SyMon III --- 6502/65c02 BIOS with monitor and assembler
Multi-I/O card image

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A multi-I/O card for SyMon Magnum's card cage

Multi-I/O card

This has the following:

16 channel 8-bit A to D(ADC0816CCN),
8-bit D to A(AD558JD),
24-bit parallel I/O(P8255A-5),
5 channel 16-bit Counter/Timer(AM9513DC),
5-digit LED hex display(TIL311),
MPU wait-state generator,
Piezoelectric horn,
Connector for Hitachi style LCD modules.