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Sad Mac codes

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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