| ID | Function | Manda- tory | Recom- mended | Headers | Ext Conn. | Validated | Tested |
|---|---|---|---|---|---|---|---|
| PCB001 | Backplane | 3 | 6 | 1 | No | v1.1 | v1.0 |
| PCB002 | Instruction decoder | 1 | 1 | 3 | No | v1.0 | No |
| PCB003 | Memory, clock and power | 1 | 1 | 2 | 2 | No | No |
| PCB004 | Adder decoder | 1 | 1 | 3 | No | No | No |
| PCB005 | Adder | 3 | 3 | 3 | No | No | No |
| PCB006 | 8+8 bits ALU | 1 | 1 | 3 | No | No | No |
| PCB007 | IO board | 0 | 1 | 2 | 3 | No | No |
| PCB008 | 512k ROM cartridge | 0 | 1 | N/A | No | No | No |
| PCB009 | 512k ROM cartridge with ZIF socket | 0 | 1 | N/A | No | No | No |
| PCB010 | Video adapter | 0 | 1 | 2 | 1 | No | No |