PCB Information
| ROM Chip ID | Region | Known Man. Dates | PCB Type | CIC | SRAM | Decoder/ Logic Circuit | Special Chips |
|---|---|---|---|---|---|---|---|
| SPAL-28-0 (front) | PAL | 9432,9431 | SHVC-BJ0N-01 | D431A | - | GD74LS00 | - |
| SPAL-28-0 (front) | PAL | 9643 | SHVC-1J0N-20 | D431B | - | - | - |
| SPAL-28-1 (front) (back) | PAL | 9441 | SHVC-BJ0N-01 | D431A | - | SN74LS00N | - |
| SPAL-28-1 (front) | PAL | 9446,9445 | SHVC-BJ0N-01 | D431A | - | GD74LS00 | - |
| SNS-28-0 (front) | USA | 9430 | SHVC-BJ0N-01 | D411A | - | SN74LS00N | - |
| SNS-28-0 (front) | USA | 9433 | SHVC-BJ0N-01 | D411A | - | SN74LS00N | - |
| SNS-28-1 (front) | USA | 9439,9440 | SHVC-BJ0N-01 | D411A | - | HD74LS00P | - |
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