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Path: blue.weeg.uiowa.edu!news.uiowa.edu!uunet!comp.vuw.ac.nz!actrix.gen.nz!dempson
From: dempson@actrix.gen.nz (David Empson)
Subject: Re: System Bad 09010001. What's it mean?
Message-ID: <Cu9tn7.J85@actrix.gen.nz>
Organization: Actrix Information Exchange
References: <326opg$q6r@eis.calstate.edu>
Date: Tue, 9 Aug 1994 14:01:54 GMT
Lines: 157
In article <326opg$q6r@eis.calstate.edu>,
Greg R. Achenbach <gachenb@eis.calstate.edu> wrote:
>
> Today I had some problems with a GS that I got recently. I have not used
> it much other than to do a self-test and boot up a disk when I first got
> it. Today I attempted to use it and got a 0911 error message. This
> message remained on the screen even after powering down and then back up
> again. I ran the self-test and got "System Bad 09010001". Two questions:
>
> 1) What does this mean and what should I do about it?
Apple Desktop Bus tools call encountered a fatal error.
Could be an overheating problem. Fatal error 0911 is often referred
to as the "need a fan" error. The ADB microcontroller seems to
overheat quite easily, and the IIgs gets out of sync with it. The
self test is just indicating the same problem.
It could also be a faulty chip, in which case a motherboard swap is
required.
> 2) Where would I find out how to interpret future "System Bad messages I
> may get in the future?
Get a copy of IIgs Technical Note #95 (ROM Diagnostic Errors). It is
on ftp.apple.com, as /dts/aii/tn/iigs/tn-iigs-095. To save you some
effort, here is the full text of the technote.
Apple II
Technical Notes
_____________________________________________________________________________
Developer Technical Support
Apple IIgs
#95: ROM Diagnostic Errors
Written by: Dan Strnad September 1990
This Technical Note describes errors returned by the ROM Diagnostics on Apple
IIgs systems.
_____________________________________________________________________________
The Built-In Diagnostics Revealed
The IIgs has a self-test capability in ROM. The self-test is activated by
pressing Open-Apple and Option on power up, or Open-Apple, Option, and Reset.
During the test, the test number is visible on the bottom of the screen
followed by six zeros. After all tests are complete, a continuous 6 KHz one-
second beep sounds and the screen displays a System Good message. If any test
fails, the screen displays a message of the form System Bad: AABBCCDD on the
lower left hand side and a staggered AABBCCDD on the upper left hand side to
help read the error code in the event of a RAM failure. In the event of video
failure, the failure code is also sent to the printer port. In the number
contained in the error message, AA is the test number that failed and the
failure code is embedded in the BB, CC, and DD fields. The complete failure
codes for each of the 12 tests are as follows:
Self Test 1: ROM Test
AA = 01
BB = Failed checksum
DD = 01 if the test encountered bad RAM and the error code is a RAM error
code similar to the RAM Test error codes
For a failure in ROM, the ROM diagnostics also display RM on the top
left hand corner of the screen.
Self Test 2: RAM Test
AA = 02
BB = Bank Number (or $FF for ADB Tool call error)
CC = Bit(s) failed
Self Test 3: Soft Switches and State Register Test
AA = 03
BB = State Register bit (if any)
CC = Low byte of soft switch address
Self Test 4: RAM Address Test
AA = 04
BB = Failed bank number (or $FF for ADB Tool call error)
CCDD = Failed address
Self Test 5: Speed Test
AA = 05
BB = 01: Speed stuck slow
02: Speed stuck fast
Self Test 6: Serial Test
AA = 06:
BB = 01: Register R/W
04: Tx Buffer empty status
05: Tx Buffer empty failure
06: All Sent Status fail
07: Rx Char available
08: Bad data
Self Test 7: Clock Test
AA = 07
DD = 01: Fatal error occurred and the test is aborted
Self Test 8: Battery RAM Test
AA = 08
BB = 01: Address test and CC = bad address
02: Non-volatile RAM failed and CC = pattern, DD = address
Self Test 9: Apple Desktop Bus Test
AA = 09
BBCC = Bad checksum
DD = 01: Apple Desktop Bus tools call encountered a fatal error, no
checksum computed.
Self Test 10: Shadow Register Test
AA = 0A
BB = 01: Text page 1 fail
02: Text page 2 fail
03: Apple Desktop Bus Tool call error
04: Power On Clear bit error
Self Test 11: Interrupts Test
AA = 0B
BB = 01: VBL interrupt time-out
02: VBL IRQ status fail
03: 1/4 sec interrupt
04: 1/4 sec interrupt
05:
06: VGC IRQ
07: Scan line
Self Test 12: Sound Test
AA = 0C
DD = 01: RAM data error
02: RAM address error
03: Data register failed
04: Control register failed
05: Oscillator interrupt timeout
Further Reference
_____________________________________________________________________________
o Apple IIgs Hardware Reference, Second Edition
--
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand