Advanced Mac Substitute is an API-level reimplementation of 1980s-era Mac OS

Advanced Mac Substitute

MacPaint running in Advanced Mac Substitute (click to see video)

Advanced Mac Substitute

Advanced Mac Substitute is an API-level reimplementation of 1980s-era Mac OS. It runs 68K Mac applications in an emulator without an Apple ROM or system software.

System’s Twilight running in Advanced Mac Substitute.

Lode Runner running in Advanced Mac Substitute

The opening of the prologue cinematic from The Fool’s Errand running in Advanced Mac Substitute

Amazing running in Advanced Mac Substitute (point to see the solved maze)

Unlike traditional emulators, Advanced Mac Substitute doesn’t emulate the hardware on which an operating system runs (except for the 680x0 processor), but actually replaces the OS — so it launches directly into an application, without a startup phase.

Welcome to Advanced Mac Substitute. (This is an application, not a real loading screen.)

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