- IC1 - XR68C681
- IC2 - 74HC245
- IC3 - 74HC541
- IC4 - 74HC32
- IC5 - ICL7660
- IC6 - ICL7660
- IC7,IC9 - MC1489
- IC8,IC10 - MC1488
- X-TAL 3.6865 MHz
- NMI - interrupt enable/disable
- SELECT
/CSEL0 = $DE00-$DE0F
or
/CSEL1 = $DE10-$DE1F
-
D7 - POWER channel B ---------
- D6 - TxRDY
- D4 - RxRDT channel A ---------
- D5 - TxRDY
- D3 - RxRDY