PCB Information
| ROM Chip ID | Region | Known Man. Dates | PCB Type | CIC | SRAM | Decoder/ Logic Circuit | Special Chips |
|---|---|---|---|---|---|---|---|
| SPAL-AR-0 (front) | PAL | 9244 | SHVC-1A3B-13 | D413A | 64k | SN74LS139N | - |
| SNS-AR-0 (front) | USA | 9133 | SHVC-1A3B-11 | D411 | 64k | MB74LS139 | - |
| SNS-AR-0 (front) | USA | 9136 | SHVC-1A3B-11 | D411 | 64k | MB74LS139 | - |
| SNS-AR-0 (front) (back) | USA | 9137 | SHVC-1A3B-11 | D411 | 64k | MB74LS139 | - |
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