Intel Raptor AT manual Table D-7 Bus Checkpoint Codes

Appendix D: Industrial Devices

Checkpoint	Description
Code
00h	Code copying to specific areas is done. Passing control
	to INT 19h boot loader next.
Table D-7 Bus Checkpoint Codes

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

Checkpoint			Description
Code
2Ah	Initializing	the	different	bus	system,	static, and output
	devices, if present.
38h	Initialized	bus	input,	IPL,	and general devices, if
	present.
39h	Displaying bus initialization error messages, if any.
95h	Initializing	bus	adaptor	ROMs from		C8000h through
	D8000h.
Table D-8 Additional Bus Checkpoints

While control is inside the different bus routines, additional checkpoints are output to I/O port address 0080h as word to identify the routines being executed.

These are word checkpoints. The low byte of checkpoint is the system BIOS checkpoint where control is passed to the different bus routines.

The high byte of checkpoint indicates that the routine is being executed in different buses. This information will not be shown on POST code display because this device is 8-bit only. However, it can be seen in any equipment connected to I/O port address 0080h.

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