https://github.com/beng49/cpu

Circuit simulator of Ben Eater's 8 bit CPU
https://github.com/beng49/cpu

Last synced: about 1 month ago
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Circuit simulator of Ben Eater's 8 bit CPU

• Host: GitHub
• URL: https://github.com/beng49/cpu
• Owner: BenG49
• License: mit
• Created: 2021-12-11T20:40:17.000Z (about 3 years ago)
• Default Branch: main
• Last Pushed: 2024-11-04T22:13:23.000Z (3 months ago)
• Last Synced: 2024-11-04T23:20:08.022Z (3 months ago)
• Language: Python
• Size: 2.96 MB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# cpu

Digital logic simulation of [Ben Eater's 8-bit CPU](https://eater.net/8bit).

Using https://github.com/hneemann/Digital logic simulator and https://github.com/hlorenzi/customasm assembler.

# Modifications

- 4 bit -> 8 bit addresses

- 8 bit opcodes (instructions with arguments spread over 2 bytes)

- Add a stack

  - Add a stack pointer up/down counter (starts at 0xFF)

  - Add PHA/PLA instructions

  - Add CALL instruction (clobbers A register)

  - Add RET instruction (jumps to address at stack pointer in memory)

- Extend instruction set

  - Add imm for LDA, ADD, SUB

![picture of circuit](https://github.com/BenG49/cpu/blob/main/cpu.png?raw=true)