Editing Sad Mac Error Codes (section)

== Macintosh Portable Diagnostic Codes ==

The Macintosh Portable (M5120 / M5126) inherits the expanded format but uses a notably different test numbering scheme and adds a full set of Power Manager handshake codes. It is also the only machine documented to have substantial errata in the Apple Developer Note: several published codes are flat-out wrong. The community-maintained reference at [https://macintoshportable.info/SadMac/ macintoshportable.info] is the authoritative source.

=== Critical tests (will halt boot) ===

{| class="wikitable"
|+ ''Portable critical tests''
! Test (TT) !! Name !! Minor code
|-
| 01 || ROM checksum || {{code|0000FFFF}} if mismatched
|-
| 03 || RAM modulo-3 test || Bitmask of failing data lines (16-bit bus on the Portable)
|-
| 05 || Address line test || XOR of expected vs. actual at the failing boundary
|-
| 06 || VIA init || (no test — only appears if an exception fires during init)
|-
| 08 || Data bus test at end of RAM || Bitmask of failed bits
|-
| 0B || SCSI init || (exception only)
|-
| 0C || SWIM init || (exception only)
|-
| 0E || Data bus test at start of RAM || Bitmask of failed bits
|-
| 0F || System error before error table loaded || Minor = exception number
|-
| 10 || Power Manager self-test || Minor is the PM communication code (see below)
|-
| 11 || Memory sizing || Often pairs with a PM communication error
|-
| 14 || Power Manager communication || Minor = PM handshake state (see below)
|-
| 82 || VRAM data test ||
|-
| 83 || VRAM address test ||
|}

=== Power Manager handshake codes (CD33–CD38) ===

The Portable, PowerBook 100, and later PowerBooks share a Power Manager [[IC]] that communicates with the main CPU over a custom serial-handshake protocol. Failures of this protocol surface as one of:

* '''CD33''' — During a receive, Power Manager did not finish a handshake
* '''CD34''' — During a receive, Power Manager did not start a handshake
* '''CD35''' — During a send, Power Manager did not finish a handshake
* '''CD36''' — During a send, Power Manager did not start a handshake
* '''CD37''' — Timed out waiting for reply to initial handshake
* '''CD38''' — Power Manager was never ready to start a handshake

CD38 in particular is the canonical "dead Power Manager" symptom — typically a Macintosh Portable with a failed PMGR PCB battery (the small PCB-mounted backup cell, not the main lead-acid pack) or PMGR firmware corruption.

=== Non-critical tests (logged but allow boot) ===

* '''80''' — Mapper RAM data test
* '''81''' — Mapper RAM uniqueness test
* '''84''' — SCC register test
* '''85''' — SCC loopback test
* '''86''' — SCC timer test
* '''87''' — Full VIA test
* '''88''' — Full SCSI test
* '''89''' — Apple Sound Chip test
* '''8A''' — PRAM test (no-op — always logs failure but ignored)

=== Extended exception list (68020 / 68030 / FPU / PMMU) ===

These exception codes are ORed into the lower byte of the major code on Mac II family and Portable machines (the same OR-encoding rule applies as for the compact-Mac codes):

* '''0100''' — Bus error
* '''0200''' — Address error
* '''0300''' — Illegal instruction
* '''0400''' — Divide by zero
* '''0500''' — CHK / Check instruction
* '''0600''' — TRAPV / overflow
* '''0700''' — Privilege violation
* '''0800''' — Trace
* '''0900''' — Line A (A-trap dispatch)
* '''0A00''' — Line F (F-line — usually FPU)
* '''0B00''' — Unassigned exception
* '''0C00''' — FPU protocol violation
* '''0D00''' — Format exception
* '''0E00''' — Spurious interrupt
* '''0F00''' — Trap-instruction vectors
* '''1000–1600''' — Interrupt level 1–7 with no handler
* '''1700''' — FPU branch / set on unordered condition
* '''1800''' — FPU inexact result
* '''1900''' — FPU divide by zero
* '''1A00''' — FPU underflow
* '''1B00''' — FPU operand error
* '''1C00''' — FPU overflow
* '''1D00''' — FPU signaling NaN
* '''1E00''' — PMMU configuration
* '''1F00''' — PMMU illegal operation
* '''2000''' — PMMU access-level violation