hs6502

A 6502 CPU emulator written in haskell.

The hs6502 repository is divided into three main parts:

• the HS6502 library, the CPU emulator itself (in src/)
• a basic assembler to create binary programs (in assembler/)
• a basic "fantasy computer" with 32KiB/32KiB of RAM/ROM (respectively) for running assembled programs (in app/)

Usage

To run the emulator use cabal build to build each part, or simply use cabal run:

# Assemble the 6502 assembly file 'program.s' into a binary program
~ $ cabal -O2 run assembler program.s

# Run the resulting binary program 'program.bin'
~ $ cabal -O2 run hs6502 program.bin

Assembling and running programs

Example programs are available in the examples/ folder. To assemble them, simply run the assembler on every file:

~ $ cabal -O2 run assembler examples/*.s

And run them as was shown above.

Creating your own programs

You can also create and assemble your own programs.

todo... check out https://www.nesdev.org/obelisk-6502-guide/ and the hi command in the debugger if you are actually interested in doing this.

Useful and helpful sources

• The Nesdev Wiki, especially the CPU section and obelisk 6502 reference
• Including external links found on the wiki or otherwise:
  • 6502 opcode matrix
  • 6502 instruction set decoding from opcodes
• The Mesen emulator, especially it's assembler and extensive debugger