Tms4532 Verified Site

As a dynamic memory chip from the 1980s, the TMS4532 is prone to several age-related failures. If you are repairing a vintage board, here is what to look for.

The is a historically significant 32Kx1-bit dynamic RAM (DRAM) chip manufactured by Texas Instruments, most famously utilized in the Sinclair ZX Spectrum 48K home computer. Rather than being a natively designed 32K chip, it was a "cost-optimized" product—essentially a TMS4164 (64K DRAM) that had failed quality testing in one half of its memory array but remained functional in the other. Historical Context: The Silicon "Reject" tms4532