Macintosh Portable ROMs:Die Sad Mac Codes (Macintosh Portable)
Dieser Text ist im Internet als File sad-mac-codes.hqx abgelegt
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:
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.
r 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:
| $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. |
| $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. |
| $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 |