- MC68230 PI/T. Provides two banks of 8-bit I/O and a timer counter, with an external 10MHz clock.
- DS1307 Real time clock with battery backup.
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- PS/2 keyboard and mouse interfaces. If you use these, they will tie up the second port on the duart.
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- PS/2 keyboard and mouse interfaces. If you use these, they will tie up the second port on the duart. The PS/2 signals are decoded by an on-board ATMega328 and passed to the main processor via channel B on the duart. Jumpers will need to be set accordingly.