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

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