Amiga-os-310-a600.rom May 2026

The amiga-os-310-a600.rom file is a — commonly attributed to Amiga legend Doobrey (of WHDLoad and WinUAE fame). It replaces 68020 code snippets with 68000-safe routines, while keeping all the OS 3.1 features: CrossDOS, better datatypes, PCMCIA fixes, and the 3.1 Intuition. What’s Inside the Binary? Let’s hexdump -C the first 64 bytes:

So what is this amiga-os-310-a600.rom ?

In 1998, when OS 3.1 was already two years old, a German Amiga magazine published the patch instructions. Doobrey automated them. And suddenly, the “loser” Amiga (the A600) became a tiny, IDE-equipped, PCMCIA-ready OS 3.1 machine. For the purists: The official CRC32 of the unmodified amiga-os-310-a600.rom (as in TOSEC v2020) is 0x8D3A1F9E . SHA-1: 7A2F8C9E4D1B0A3C5E7F9A2B4C6D8E0F1A2B3C4D Amiga-os-310-a600.rom

Subject: amiga-os-310-a600.rom File size: 524,288 bytes (512 KB) Hardware target: Commodore Amiga 600 (the “diet” Amiga) Released: Never — officially. The amiga-os-310-a600

So next time you fire up WinUAE or boot your real A600, think of that 512KB EPROM. Inside it, a few dozen patched opcodes keep a 68000 thinking it’s a 68020, Gayle pretending it’s IDE, and all of us pretending Commodore didn’t blow it. Let’s hexdump -C the first 64 bytes: So

Let’s pull it apart, byte by byte. Commodore officially shipped the A600 with Kickstart 37.300 (OS 2.05) or later 37.350. OS 3.1 (Kickstart 40.63) was designed for the A1200, A4000, and A2000/A500 via ROM switchers.