IBM 201 Manuale Utente

1-1-2 (Processor register
test failed)

1-1-3 (CMOS write/read test
failed)

1. Battery

2. System board

1-1-4 (BIOS EEPROM
checksum failed)

1-2-1 (Programmable
Interval Timer failed)

1-2-2 (DMA initialization
failed)

1-2-3 (DMA page register
write/read failed)

1-2-4 (RAM refresh
verification failed)

1. DIMM

2. System board

1-3-1 (1st 64K RAM test
failed)

1-3-2 (1st 64K RAM parity
test failed)

1. DIMM

2. System board

2-1-1 (Secondary DMA
register failed)

2-1-2 (Primary DMA register
failed)

2-1-3 (Primary interrupt
mask register failed)

2-1-4 (Secondary interrupt
mask register failed)

2-2-2 (Keyboard controller
failed)

1. System board

2. Keyboard

2-2-3 (CMOS power failure
and checksum checks failed)

1. Battery

2. System board

2-2-4 (CMOS configuration
information validation failed)

1. Battery

2. System board

2-3-1 (Screen initialization
failed)

1. Jumper on J14

2. System board

2-3-2 (Screen memory
failed)

2-3-3 (Screen retrace failed)

2-3-4 (Search for video
ROM failed)

2-4-1 (Video failed; screen
believed operable)

Appendix C. Engine POST messages