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An FPGA-based LGP-30 Replica
A pocket-sized, FPGA-based replica of the LGP-30 computer
The magnetic drum contained not only the main memory, but also the CPU’s three 32-bit registers, and several tracks with timing signals to control the instruction decoding and execution. The CPU and the magnetic drum storage are recreated in an FPGA – by implementing the complete logic equations published by the LGP-30’s inventor (in a scientific paper and in the computer’s service manual). The updated binary files also bring some improvements for all older LittleGP-30 boards: Flip-flop contents are displayed and decoded on the HDMI screen, to make it easier to follow the operation in single-step mode.
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