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Sad Mac error codes for Macintosh. From the Apple Technical Information Library.
Macintosh Portable Error codes

Macintosh Portable ROMs:

The bootup code in the Macintosh Portable contains a series of startup tests that are run to ensure that the fundamental operations of the machine are working properly. If any of those tests fail, a Sad Mac icon appears on the screen with a code below that describes what failure occurred. Here is a typical example of a Sad Mac display with an error code below it:

sad_mac4

The two codes are actually the contents of the two CPU data registers D6 and D7. The upper word (upper 4 hex digits, in this case 0546) of D7 contains miscellaneous flags that are used by the start-up test routines and are unimportant to just about everybody except a few test engineers within Apple. The lower word of D7 is the major error code. The major error code identifies the general area the test routines were in when a failure occurred. D6 is the minor error and usually contains additional information about the failure, something like a failed bit mask.

sad_mac_5

The major error is further broken into the upper byte that contains the number of any 68000 exception that occurred ($00 meaning that no exception occurred), and the lower byte that usually contains the test that was being run at the time of failure. If an unexpected exception occurred during a particular test, then the exception number is logically ORed into the major error code. This way both the exception that occurred as well as the test that was running can be decoded from the major error code:

sad_mac_6

In this example, the code says that an address error exception ($0200) occurred during the RAM test for Bank A ($03); $0200 ORed with $03 = $0203.

The table below explains the codes.



Major Error Codes...

Below is a brief description of the various test codes that might appear in the major error code:

Warning: Some of these codes may mean slightly different things in Macintosh models other than the Macintosh Portable. These descriptions describe specifically how they are used in the Macintosh Portable.

$01 - ROM test failed. Minor error code is $FFFF, means nothing.
$02 - RAM test failed. Minor error code indicates which RAM bits failed.
$05 - RAM external addressing test failed. Minor error code indicates a
failed address line.
$06 - Unable to properly access the VIA 1 chip during VIA initialization.
Minor error code not applicable.
$08 - Data bus test at location eight bytes off of top of memory failed.
Minor error code indicates the bad bits as a 16-bit mask for bits 15-00.
This may indicate either a bad RAM chip or data bus failure.
$0B - Unable to properly access the SCSI chip. Minor error code not
applicable.
$0C - Unable to properly access the IWM (or SWIM) chip. Minor error code
not applicable.
$0D - Not applicable to Macintosh Portable. Unable to properly access the
SCC chip. Minor error code not applicable.
$0E - Data bus test at location $0 failed. Minor error code indicates the
bad bits as a 16-bit mask for bits 15-00. This may indicate either a
bad RAM chip or data bus failure.
$10 - Video RAM test failed. Minor error code indicates which RAM bits
failed.
$11 - Video RAM addressing test failed. Minor error code contains the
following: upper word = failed address (16-bit) msb of lower word
= data written lsb of lower word = data read Data value written also
indicates which address line is being actively tested.
$12 - Deleted
$13 - Deleted
$14 - Power Manager processor was unable to turn on all the power to
the board. This may have been due to a communication problem with
the Power Manager. If so, the minor error code contains a Power Manager
error code, explained in the next section.
$15 - Power Manager failed its self-test. Minor error code contains the
following:
msw = error status of transmission to power manager
lsw = Power Manager self-test results (0 means it passed, non-zero
means it failed)
$16 - A failure occurred while trying to size and configure the RAM.
Minor error code not applicable.

Minor error codes-Power Manager processor failures

If a communication problem occurs during communication with the Power Manager, the following error codes will appear somewhere in the minor error code (usually in the lower half of the code, but not always):

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

Diagnostic Code Summary

Below is a summarized version of the Sad Mac error codes:

Test Codes
$01 ROM checksum test.
$02 RAM test.
$05 RAM addressing test.
$06 VIA 1 chip access.
$08 Data bus test at top of memory.
$0B SCSI chip access.
$0C IWM (or SWIM) chip access.
$0D Not applicable to Macintosh Portable. SCC chip access.
$0E Data bus test at location $0.
$10 Video RAM test.
$11 Video RAM addressing test.
$14 Power Manager board power on.
$15 Power Manager self-test.
$16 RAM sizing.

Power Manager communication error codes
$CD38 Initial handshake.
$CD37 No reply to initial handshake.
$CD36 During send, no start of a handshake.
$CD35 During a send, no finish of a handshake.
$CD34 During a receive, no start of a handshake.
$CD33 During a receive, no finish of a handshake.

CPU exception codes (as used by the startup tests)
$0100 Bus error exception code
$0200 Address error exception code
$0300 Illegal error exception code
$0400 Zero divide error exception code
$0500 Check inst error exception code
$0600 cpTrapcc,Trapcc,TrapV exception code
$0700 Privilege violation exception code
$0800 Trace exception code
$0900 Line A exception code
$0A00 Line F exception code
$0B00 Unassigned exception code
$0C00 CP protocol violation
$0D00 Format exception
$0E00 Spurious interrupt exception code
$0F00 Trap inst exception code
$1000 Interrupt level 1
$1100 Interrupt level 2
$1200 Interrupt level 3
$1300 Interrupt level 4
$1400 Interrupt level 5
$1500 Interrupt level 6
$1600 Interrupt level 7

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