MartyPC is a cycle-accurate emulator of early IBM PCs and compatibles, implemented in Rust and runnable on Windows, Linux and macOS (with a browser demo available). It is designed as a development aid for retro PC programming, emphasizing precise timing, extensive logging and debugging rather than plug-and-play ease. Cycle-accuracy work began in late 2022 and was validated against a real Intel 8088 connected to an Arduino MEGA and other hardware probes; MartyPC passes the 8088 V2 Test Suite with 99.9997% cycle-accuracy. That fidelity enabled it to run demanding demos such as 8088MPH and to fully reproduce every effect in Area 5150.
Feature coverage is broad: a cycle-accurate Intel 8088, a preliminary NEC V20, and a wide set of peripherals (8255 PPI, 8259 PIC, highly accurate 8253 PIT, partially implemented 8237 DMAC, 8250 UART, game/parallel ports). Video emulation includes a dynamic, cycle-or-character-clocked CGA (with composite output and overscan), MDA/Hercules, EGA and working VGA modes; PCjr/Tandy support is underway. Sound emulation covers PC speaker, Adlib (OPL2 via nuked-opl3), SN76489 and the Disney Sound Source. Storage emulation includes a μPD765 FDC, XT-IDE and other controllers with flux-image support. Additional capabilities include dual-head displays, configurable machine overlays, memory expansion cards, many input device models and an extensive GUI debugger for disassembly, CPU state and memory inspection.
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