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44 lines
1.7 KiB
Markdown
44 lines
1.7 KiB
Markdown
[](https://saythanks.io/to/irmen)
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[](https://travis-ci.org/irmen/ksim65)
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# KSim65 - Kotlin/JVM 6502/65C02 microprocessor simulator
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*Written by Irmen de Jong (irmen@razorvine.net)*
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*Software license: MIT, see file LICENSE*
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This is a Kotlin/JVM library that simulates the 8-bit 6502 and 65C02 microprocessors,
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which became very popular in the the early 1980's.
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Properties of this simulator:
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- Written in Kotlin. It is low-level code, but hopefully still readable :-)
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- Designed to simulate hardware components (bus, cpu, memory, i/o controllers)
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- IRQ and NMI simulation
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- Aims to be clock cycle-precise (not yet 100% correct right now)
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- Aims to implements all 6502 and 65c02 instructions, including the 'illegal' 6502 instructions (not yet done)
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- correct BCD mode for adc/sbc instructions on both cpu types
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- passes several extensive unit test suites that verify instruction and cpu flags behavior
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- maximum simulated performance is a 6502 running at ~100 Mhz (on my machine)
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## Documentation
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Still to be written. For now, use the source ;-)
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## Virtual machine examples
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Three virtual example machines are included.
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The default one starts with ``gradle run`` or run the ``ksim64vm`` command.
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There's another one ``ehBasicMain`` that is configured to run the "enhanced 6502 basic" ROM:
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Finally there is a fairly functional C64 emulator running the actual roms (not included,
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but can be easily found elsewhere for example with the Vice emulator):
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