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Sad Mac Error Codes
These error codes are for the Macintosh 128K - Macintosh Plus
Sad Mac errors are in the following manner:
Class Code + Sub Code = YYXXXX
The class code tells you how bad of an error occurred and the sub code tells you what or where the error is.
Class Code 01XXXX = ROM test failed Replace ROMs on motherboard 02XXXX = Memory test - bus subtest Memory chip failure- See Single Chip ID below 03XXXX = Memory test - byte write Memory chip failure- See Single Chip ID below 04XXXX = Memory test - Mod3 test Memory chip failure- See Single Chip ID below 05XXXX = Memory test - address uniqueness Memory chip failure- See Single Chip ID below 0FXXXX = Exception - Software Error- See Exception chart below ----------------------------------------------------------------------- Single Chip Identification YY = 02 - 05 Data Bit Location Sub Code 0 F5 0001 1 F6 0002 2 F7 0004 3 F8 0008 4 F9 0010 5 F10 0020 6 F11 0040 7 F12 0080 8 G5 0100 9 G6 0200 10 G7 0400 11 G8 0800 12 G9 1000 13 G10 2000 14 G11 4000 15 G12 8000 ----------------------------------------------------------------------- Exception chart YY = 0F Sub Code YY0001 Bus error YY0002 Address error YY0003 Illegal instruction YY0004 Zero divide YY0005 Check instruction YY0006 Traps instruction YY0007 Privilege violation YY0008 Trace YY0009 Line 1010 or Trap dispatch error YY000A Line 1111 YY000B Other exception or trap YY000C Unimplemented trap YY000D NMI (normal indication)- Interrupt button on Programmers switch was pressed YY0062 64K ROM Mac reading a HFS formatted disk YY0064 Couldn't Read System File into Memory or 64K ROM Mac reading a HFS formatted disk YY0065 Bad Finder Most exceptions are caused by a bad System file on the startup disk. Try replacing it with a backup.
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