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Copyright 1991 David Jurgens |
INT 15,C0 - Return System Configuration Parameters (PS/2 only)
AH = C0
on return:
CF = 0 if successful
= 1 if error
AH = when CF set, 80h for PC & PCjr, 86h for XT
(BIOS after 11/8/82) and AT (BIOS after 1/10/84)
ES:BX = pointer to system descriptor table in ROM of the format:
Offset Size Description
00 word length of descriptor (8 minimum)
02 byte model byte (same as F000:FFFE, not reliable)
03 byte secondary model byte
04 byte BIOS revision level (zero based)
05 byte feature information, see below
06 dword reserved
Feature Information
│7│6│5│4│3│2│1│0│ Feature Byte
│ │ │ │ │ │ │ └──── reserved
│ │ │ │ │ │ └───── 0=PC bus, 1=Micro Channel
│ │ │ │ │ └────── Extended BIOS Data Area (EBDA)allocated
│ │ │ │ └─────── wait for external event supported
│ │ │ └──────── INT 15,4F used (kbd intercept)
│ │ └───────── RTC present
│ └────────── 2nd 8259 present
└─────────── DMA channel 3 used by fixed disk BIOS
- see MACHINE ID
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| Esc or Alt-X to exit |
int 15,c0 |
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