Intel Raptor AT manual Bits Description

Raptor AT – Installation Guide

The system BIOS passes control to different buses at the following checkpoints:

High Byte The high byte of these checkpoints includes the following information:

Bits					Description
	0000		Function	0.	Disable all devices on the bus.
	0001		Function	1.	Initialize static devices on the bus.
	0010		Function	2.	Initialize output devices on the bus.
Bits 7-4	0011		Function	3.	Initialize input devices on the bus.
	0100		Function	4.	Initialize IPL devices on the bus.
	0101		Function	5.	Initiate general devices on the bus.
	0110		Function	6.	Initialize error reporting on the bus.
	0111		Function	7.	Initialize add-on ROMs for all buses.
	Specify the bus
	0	Generic DIM Device Initialization Manager.
Bits 3-0	1	Onboard System devices.
	2	ISA devices.
	3	EISA devices.
	4	ISA PnP devices.
	5	PCI devices.

Table D-9 AMIBIOS Beep Codes

Except for beep code #8, these codes are always fatal.

1 beep	Refresh failure.
2 beeps	Parity error.
3 beeps	Base 64K memory failure.
4 beeps	Timer not operational.
5 beeps	Processor error.
6 beeps	8042 - gate A20 failure.
7 beeps	Processor exception interrupt error.
8 beeps	Display memory read/write failure.
9 beeps	ROM checksum error.
10 beeps	CMOS shutdown register read/write error.
11 beeps	Cache memory bad.

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