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- 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
-
-