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Texas Instruments TMS2764-20JL is a 64 Kbit (8K x 8) UV-erasable EPROM in a 28-pin windowed ceramic DIP package. The -20 speed grade has a maximum access time of 200 ns. New old stock (NOS), blank-tested.
Programming: This chip can be programmed with the Relatively Universal ROM Programmer (RURP) and is supported by the Firestarter software. Select the chip profile that matches this exact part and its datasheet programming voltage.
This is a TMS2764, not the CMOS TMS27C64; check the datasheet pinout and programming requirements before use. The windowed EPROM requires UV light for erasure.
The photo shows a sample of the actual stock; it has been cropped and exposure-adjusted.
Texas Instruments MOS Memory Data Book (TMS2764)
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