LisaEmu

A native macOS emulator for the Apple Lisa. Takes Apple's officially released Lisa OS 3.1 source code (released 2018 via the Computer History Museum) and compiles it into a bootable system, then runs it on an emulated Motorola 68000

• Lisa hardware stack.

Two layers:

1. Toolchain — 68000 cross-assembler + Lisa Pascal cross-compiler + linker that processes Lisa_Source/ into bootable disk images and ROM.
2. Emulator — 68000 CPU core + Lisa hardware (MMU, dual VIA 6522, video, keyboard, mouse, ProFile hard disk, floppy).

Lisa_Source/ is NOT included — Apple's Academic License permits use but prohibits redistribution. You must supply your own copy.

Build & Run

# Standalone SDL2 build
make
build/lisaemu --image prebuilt/los_compilation_base.image

# Toolchain audit (primary diagnostic)
make audit

# Xcode macOS app
cd lisaOS && xcodebuild -scheme lisaOS -destination 'generic/platform=macOS' build

Layout

See CLAUDE.md for the full directory map, hardware specs, and current status. See docs/ for Lisa_Source reference material and hardware documentation.