Memory chips for restoration, repair and programming work: UV-erasable EPROMs (2732, 27128, 27C128), parallel EEPROMs (28C64), bipolar PROMs (82S123 and relatives), serial EEPROM and SPI NOR flash (W25X, W25Q, MX25L), NAND flash, SRAM, SDRAM, FPGA configuration PROMs, and a few DDR and DDR2 desktop memory modules.
What to match: density and organization (for example 16K x 8), package (ceramic DIP with a window, plastic DIP, SOIC, PLCC), access time (a faster part, such as 120 ns, can usually replace a slower one, not the other way round) and, for EPROMs, the programming voltage your programmer supports.
Makers include STMicroelectronics, Winbond, Samsung, Xilinx, Cypress Semiconductor, AMD, Macronix, Signetics and Crucial.
Related: Microprocessors & Peripherals, Microcontrollers and Computing.
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