PC8300 Timex ROM

Developer: Fred Nachbaur
Date: 1987
Price: $14.95
Rarity: uncommon

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 bent up and connected, and the EPROM was placed in a 24-pin socket.

The images below show the PC8300 ROM with and without socket.

How to make a modern replacement

You’ll need:

Download the binary image (below) and burn it to the 28C64. Configure your adapter and insert in the 8300.

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