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49 lines
2.1 KiB
Markdown
49 lines
2.1 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 various hardware components (bus, cpu, memory, i/o controllers)
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- IRQ and NMI simulation
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- Aims to simulate correct instruction cycle timing, but is not 100% cycle exact for simplicity
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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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- simple debugging machine monitor, which basic disassembler and assembler functions
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- provide a few virtual example machines, one of which is a Commodore-64
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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](http://vice-emu.sourceforge.net/).
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The emulator supports character mode, bitmap mode (hires and multicolor), hardware sprites and
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various timers and IRQs. It's not cycle perfect, and the video display is drawn on a per-frame basis,
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so raster splits/rasterbars are impossible. But many other things work fine.
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