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BEEP ERROR CODES
It is normal for a XT or AT clone to beep once or twice during
the POST test. More that this indicates a severe error. Beep
codes are issued as a sequence of three sets of beeps. For
example, BEEP {pause} BEEP BEEP {pause} BEEP BEEP is the code
represented as 1--2--2. The Phoenix ROM name is listed by each
beep code.
1--1--3 CMOS WRITE/READ FAILURE
1--1--4 ROM BIOS CHECKSUM ERROR
1--2--1 PROGRAMMABLE INTERVAL TIMER FAILURE
1--2--2 DMA INITIALIZATION FAILURE
1--2--3 DMA PAGE REGISTER WRITE/READ FAILURE
1--3--1 RAM REFRESH VERIFICATION FAILURE
1--3--3 FIRST 64K RAM CHIP OR DATA LINE FAILURE
MULTI-BIT
1--3--4 FIRST 64K ODD/EVE LOGIC FAILURE
1--4--1 ADDRESS LINE FAILURE 64K OF RAM
1--4--2 PARITY FAILURE FIRST 64K OF RAM
2--1--1 BIT 0 FIRST 64K RAM FAILURE
2--1--2 BIT 1
2--1--3 BIT 2
2--1--4 BIT 3
2--2--1 BIT 4
2--2--2 BIT 5
2--2--3 BIT 6
2--2--4 BIT 7
2--3--1 BIT 8
2--3--2 BIT 9
2--3--3 BIT 10
2--3--4 BIT 11
2--4--1 BIT 12
2--4--2 BIT 13
2--4--3 BIT 14
2--4--4 BIT 15 FIRST 64K RAM FAILURE
3--1--1 SLAVE DMA REGISTER FAILURE
3--1--2 MASTER DMA REGISTER FAILURE
3--1--3 MASTER INTERRUPT MASK REGISTER FAILURE
3--1--4 SLAVE INTERRUPT MASK REGISTER FAILURE
3--2--4 KEYBOARD CONTROLLER TEST FAILURE
3--3--4 SCREEN INITIALIZATION FAILURE
3--4--1 SCREEN RETRACE TEST FAILURE
4--2--1 TIMER TICK FAILURE
4--2--2 SHUTDOWN TEST FAILURE
4--2--3 GATE A20 FAILURE
4--2--4 UNEXPECTED INTERRUPT IN PROTECTED MODE
4--3--1 RAM TEST ADDRESS FAILURE
4--3--3 INTERVAL TIMER CHANNEL 2 FAILURE
4--3--4 TIME OF DAY CLOCK FAILURE
4--4--3 MATH COPROCESSOR FAILURE