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KSim65 - Kotlin/JVM 6502/65C02 microprocessor simulator

Written by Irmen de Jong (irmen@razorvine.net)

Software license: MIT, see file LICENSE

6502

This is a Kotlin/JVM library that simulates the 8-bit 6502 and 65C02 microprocessors, which became very popular in the the early 1980's.

Properties of this simulator:

  • Written in Kotlin. It is low-level code, but hopefully still readable :-)
  • Designed to simulate hardware components (bus, cpu, memory, i/o controllers)
  • IRQ and NMI simulation
  • Aims to be clock cycle-precise (not yet 100% correct right now)
  • Aims to implements all 6502 and 65c02 instructions, including the 'illegal' 6502 instructions (not yet done)
  • correct BCD mode for adc/sbc instructions on both cpu types
  • passes several extensive unit test suites that verify instruction and cpu flags behavior
  • maximum simulated performance is a 6502 running at ~100 Mhz (on my machine)

Documentation

Still to be written. For now, use the source ;-)