DISKSERVER cpu board
The cpu board of the DISKSERVER contains a 4 MHz Z80A processor
with a 4K EPROM and 64K of RAM. Like the ORDINATOR cpu board,
it is actually capable of functioning in standalone mode, not needing any other circuit board. However, the only direct I/O capabilities of the board are the RESET switch and a few status LEDs. In practice at least a serial I/O board is needed to interface to the outside world.