Swapping the OS ROM for an EEPROM - Atari 8-Bit Computers - AtariAge Forums
AT28c256 15PI Atmel 256K (32K x 8) CMOS EEPROM NOS Industrial | eBay
AT28C256-15PU Datasheet(PDF) - ATMEL Corporation
AT28C256-15FM/883, 5962-8852506ZA, ATMEL, IC EEPROM 256KBIT 150NS 28FLATPK | eBay
GitHub - Wh1teRabbitHU/EEPROMAdapter: This adapter can read and write AT28C64 and AT28C256 EEPROM chips. Creating converter PCB for this task recommended
ATMEL AT28C256-15UI 32K x 8 EEPROM 150NS CPGA28 X 1PC | eBay
28Pin NEW EEPROM IC ATMEL DIP-28 AT28C256-15PU IC | eBay
AT28C256-15SU Microchip - Datasheet PDF & Technical Specs