Harry Porter's Relay Computer

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Simulator Help

Enter register or memory contents in binary. Memory contents includes address and comment (source) which will be echoed but otherwise ignored. Execution starts at address zero and runs to Halt or first 10,000 instructions. ALU instructions are annotated with ALU output in gray.

Computer architecture and sample program by Harry Porter. Simulator and web interface by Ward Cunningham.

Read more about the computer architecture. Read the simulator source with and without the web interface code.