Editing Sad Mac Error Codes (section)

== Macintosh LC, Performa, Centris, Quadra (68030 / 68040) ==

The LC, Performa, Centris, and Quadra lines use the same expanded format and (broadly) the same test set as the Mac II family, with a few additions for 68040-specific features (FPU subset detection, snooping/cache tests) and on AV machines for the DSP3210.

These machines are far less likely to actually display a Sad Mac in practice than the compact and II-family Macs, for two reasons. First, the ROMs are more permissive — a soft-fail on a non-critical test will let the machine continue to boot and surface the error as a bomb dialog later. Second, by the Quadra/Centris era, ASIC integration meant that a hardware fault was more likely to brick the machine outright (no screen, no chime, no Sad Mac) than to produce a clean diagnostic display.

When you do see one, treat the codes as a hybrid of the [[#Macintosh II Family (II, IIx, IIcx, IIci, IIfx, IIsi, IIvi, IIvx)|Mac II table]] above and the [[#Common Exception Codes (Class 0F)|exception table]]; the encoding rules (OR-in exception byte, two-line layout, Test Manager flags in the upper word) are identical.

The [[Macintosh Quadra 605]] and [[Macintosh LC 475|LC 475]] (Quadra 605 with a different ROM) are noteworthy for a model-specific quirk: a Sad Mac displaying '''00000005 / 0000FFFF''' is almost always the 68LC040 CPU itself, not a board fault. These machines were sold with the FPU-less 68LC040, and dropping in a full 68040 of the same speed grade resolves the symptom — see [[Macintosh Quadra 605 Troubleshooting]].