A device that writes instructions and data into PROM chips. The bits in a new PROM are all 1s (continuous lines). The PROM programmer creates only 0s by "blowing" the middle out of the 1s.
These E-PROM chips carried the fuel and spark programming codes in the engine-control units (ECU). Instead of manually adjusting the spark advance and rejetting a carburetor, tuners on EFI engines ...
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