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EPROM

EPROMs are re-writable ROM chips, generally used for SNES prototypes. To erase them, you can use UV light on the window. Due to this, EPROMs with uncovered windows are inherently prone to damage.

M27C4001
Chip type: EPROM
Manufacturer: STMicroelectronics
Size: 0x80000
Date format: xYWWxx
Variables: Full part #, Date code, written label
D27C80010-12
Chip type: EPROM
Manufacturer: NEC
Size: 0x80000
Date format: YYWWxxxxx
Variables: Date code, written label

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