Lambda 8300

The Lambda 8300, which was widely available in the States as the PC8300, was a clone of the Sinclair ZX81.

Fred Nachbaur was an ardent supporter of the PC8300 and developed a ROM that made it “90% Timex-compatible.”



Custom adaptation of the Timex/Sinclair 1000 ROM for the Lambda 8300 computer. Adapted by Fred Nachbaur, the replacement EPROM came in a 2764, a 28-pin device (several additional pins were necessary for programming EPROMs). The PC8300 ROM was a 24-pin 8K ROM. In order to fit the replacement EPROM to the PC8300, several pins were


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