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Copyright 1991 David Jurgens |
BIOS System Descriptor Table (PS/2)
Offset Size Description
00 word length of descriptor (8 minimum)
02 byte model byte (same as FFFF:E, not reliable)
03 byte secondary model byte
04 byte BIOS revision level (zero based)
05 byte feature information (see table)
06 dword reserved
│7│6│5│4│3│2│1│0│ feature information at offset 5
│ │ │ │ │ │ │ └─── 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 also MACHINE IDENT and INT 15,C0
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system descriptor |
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