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TomNisbet / TommyPROM

Simple Arduino-based EEPROM programmer
https://tomnisbet.github.io/TommyPROM/
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update PgmType for 27C040 EPROM #57

Closed wjhun closed 1 year ago

wjhun commented 1 year ago

The (AMD/Atmel) 27C040 EPROM doesn't have a dedicated Write Enable (WE), instead sharing the same pin for CE# and PGM#. This updates the PromDevice27 line for this device to use the E27C_PGM_CE PgmType.

This configuration has been successfully used to read, program and verify an AM27C040 device. A +12.75V voltage was applied to Vpp during the duration of device programming.

wjhun commented 1 year ago

Thanks for the update! Did you also need 6.5V on Vcc?

Vcc came from the Arudino alone, so I guess it only needed 5V.