Description:

Lot of 1x AMD AM27S49DC bipolar PROM (OTP programmable read-only memory), classic 27S-series device typically organized as 256 x 4 (1K-bit total). DIP-24 through-hole package. Marked “MALAY” on the chips (Malaysia). These are vintage/legacy parts commonly used for firmware/lookup tables in older controllers, arcade/industrial boards, instrumentation, and retro computer hardware.

Modern uses:

- Repair/restoration of vintage hardware needing 27S49/compatible PROMs

- Retro-computing projects (address decode / lookup tables / microcode tables)

- Industrial controller board repair / spares

- Hobby ROM table / logic replacement in legacy TTL-era designs (with correct support circuitry)

Compatibility note:

AM27S49 is a bipolar PROM family part (not EPROM/EEPROM). Confirm your programmer supports 27S-series bipolar PROMs and the exact pinout/organization (256x4) before attempting to program. Verify supply voltage, logic levels (TTL), and any required programming voltages per your programmer/device docs—do not assume it’s drop-in for 27xx EPROMs.