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