A computing enthusiast unearthed a 34-year-old data-analytics-id=”inline-link” href=”https://www.tomshardware.com/laptops/macbooks/macbook-air-m4-2025-review” data-mrf-recirculation=”inline-link” data-before-rewrite-localise=”https://www.tomshardware.com/laptops/macbooks/macbook-air-m4-2025-review”>Apple Mac bug that should have crippled the system at startup, but it never did, thanks to an undocumented feature in the data-analytics-id=”inline-link” href=”https://www.tomshardware.com/news/mouser-6502-motorola-6800-cpu-processor,14557.html” data-mrf-recirculation=”inline-link” data-before-rewrite-localise=”https://www.tomshardware.com/news/mouser-6502-motorola-6800-cpu-processor,14557.html”>Motorola CPU that quietly neutralized the flaw. data-analytics-id=”inline-link” href=”https://www.downtowndougbrown.com/2025/01/the-invalid-68030-instruction-that-accidentally-allowed-the-mac-classic-ii-to-successfully-boot-up/” target=”_blank” data-url=”https://www.downtowndougbrown.com/2025/01/the-invalid-68030-instruction-that-accidentally-allowed-the-mac-classic-ii-to-successfully-boot-up/” referrerpolicy=”no-referrer-when-downgrade” data-hl-processed=”none” data-mrf-recirculation=”inline-link”>Downtown Doug Brown discovered this Mac Classic II ROM code wrinkle after witnessing a MAME-emulated system crash (in 32-bit mode) that the original hardware would not (h/t data-analytics-id=”inline-link” href=”https://www.pcgamer.com/hardware/apples-1991-macintosh-shipped-with-a-bug-that-shouldve-stopped-it-from-booting-but-no-one-ever-knew-because-an-undocumented-cpu-trick-almost-too-crazy-to-be-true-miraculously-made-it-work/#viafoura-comments” target=”_blank” data-url=”https://www.pcgamer.com/hardware/apples-1991-macintosh-shipped-with-a-bug-that-shouldve-stopped-it-from-booting-but-no-one-ever-knew-because-an-undocumented-cpu-trick-almost-too-crazy-to-be-true-miraculously-made-it-work/#viafoura-comments” referrerpolicy=”no-referrer-when-downgrade” data-hl-processed=”none” data-mrf-recirculation=”inline-link”>PC Gamer). We tend to agree that “this bug in the ROM would have gone undiscovered for all eternity” if it were…
