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===ROMs and Programmable Logic Devices=== | ===ROMs and Programmable Logic Devices=== | ||
There are three 27256 ROMs on the 571 Main Board: | There are three 27256 ROMs on the 571 Main Board: | ||
U502 V1.1 160-6993-01 | * U502 V1.1 160-6993-01 | ||
U503 V1.6 160-6992-06 | * U503 V1.6 160-6992-06 | ||
U607 V1.1 160-6991-01 | * U607 V1.1 160-6991-01 | ||
There are two smaller decoder chips in 20-pin DIP (300mil) packages, likely to be 16V8 GAL/PAL: | There are two smaller decoder chips in 20-pin DIP (300mil) packages, likely to be 16V8 GAL/PAL: | ||
U507 160-7046-00 | * U507 160-7046-00 | ||
U509 160-7045-00 | * U509 160-7045-00 | ||
These are soldered in. | These are soldered in. | ||