=== Communication - RS232 / PC Connection ===
* [[AMSSIO|AMSSIO RS232 interface]](note: you '''cannot DIY this''' - the schematic doesn't exist yet/anymore)
* [[CPCI RS232 Interface|CPCI RS232 Interface]]
=== Real Time Clocks ===
* [[ACU_Real_Time_Clock_(DIY)|ACU Realtime Clock]] (without year counter)
* [[Real Time Clock|CPCI Real Time Clock]](note: you '''cannot DIY this''' - the schematic doesn't exist yet/anymore)
=== ROM / RAM Expansions ===