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F.02 WORD CHECK-POINTS
Additional WORD check-points are output to port 80h while control is inside the different
BUS routines. The LOW BYTE of check-point is the POST code (section E.01)
representing the system BIOS check-point from where the control is passed to different
BUS routines.
The HIGH BYTE of check-point is the indication of which routine is being executed in
different BUSes. The details of HIGH BYTE ('XY') are explained below.
The upper nibble 'X' indicates the function number being executed:
0
Disable all devices on the BUS concerned.
1
Static devices initialization on the BUS concerned.
2
Output device initialization on the BUS concerned.
3
Input device initialization on the BUS concerned.
4
IPL device initialization on the BUS concerned.
5
General device initialization on the BUS concerned.
6
Error reporting for the BUS concerned.
7
Add-on ROM initialization for all BUSes.
The lower nibble 'Y' indicates the BUS on which the different routines are being
executed:
0
Generic DIM (Device Initialization Manager).
1
On-board system devices.
2
ISA devices.
3
EISA devices.
4
ISA PnP devices.
5
PCI devices.
Post Codes & Error Codes
F-8
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