Tms4532 Review

The TMS4532 uses a multiplexed address bus to save physical pins. The key pins include:

In modern retro-computing restoration, the TMS4532 is frequently replaced with standard, fully functional 4164 (64K) DRAM chips. While the Spectrum will only use half of a 4164's capacity, these chips are more reliable and readily available than the original salvaged TI parts. Collectors and repairers must ensure that all eight chips in a bank are of the same type (all NL3 or all NL4) if they are not using modern 4164 replacements, as mixing types will lead to memory addressing errors. tms4532

During the manufacturing of 64K DRAMs (the TMS4464/4164 series), it was common for one "half" of the memory array to be defective while the other half remained perfectly functional. Rather than discarding these chips, Texas Instruments marketed them as —effectively "half-good" 64K chips that functioned as 32K components. Key Specifications and Variants The TMS4532 uses a multiplexed address bus to

When sourcing, be cautious of counterfeit parts. When installing, respect the refresh timing. And when it works—hearing that vintage system chime to life because of a single TMS4532—you’ll understand why legacy components still matter. Collectors and repairers must ensure that all eight

These chips require a stable 5V supply. Power surges from original unregulated power supplies often "bake" these chips. Replacement & Compatibility

Using an oscilloscope, probe the output pins (DQ1-DQ8) while performing a write-read cycle. If the output toggles cleanly, the chip is likely functional. A "stuck" output at 0V or 5V indicates a dead driver.