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AX = D101h BX = number of requested entry (starting with 1) DX = 0000h (reserved, must be set to 0) ES:DI -> buffer to contain DDT entry (see #00535)
Return:
AH = return code (see #00534) CF set on error CF clear on success ES:DI buffer filled with DDT entry
See Also:
AH=C0h - AH=C7h - AH=C9h - AX=D100h -
Format of Device Descriptor Table (DDT):
Offset Size Description (Table 00535)
00h BYTE bits 7-4: bits 3-0: 01h BYTE bits 7-4: bits 3-0: 02h BYTE bits 7-4: bits 3-0: Note:
I/O block addresses and non-system memory addresses are listed in
ascending order in each DDT entry.
Bitfields for DDT indicators:
Bit(s) Description (Table 00536)
15 reserved (0)
14 second arbitration level exists
13 first arbitration level exists
12 serial interface is RS-422
11 not address limited
10 DMA channel used
9 second arbitration level can be shared
8 first arbitration level can be shared
7-0 reserved (0)
Reserved (set to 0)
Slot of device (0 = system board)
Second interrupt for this device (0 = none)
First interrupt for this device (0 = none)
Second arbitration level for this device
First arbitration level for this device
03h WORD DDT indicators (see #00536)
05h BYTE reserved (0)
06h WORD device ID (0 = none)
08h WORD starting address of first I/O block (0 = none)
0Ah WORD starting address of second I/O block (0 = none)
OCh WORD starting address of third I/O block (0 = none)
OEh DWORD start of first non-system memory block (0 = none)
12h WORD size of first non-system memory block (in kilobytes)
14h DWORD start of second non-system memory block (0 = none)
18h WORD size of second non-system memory block (in kilobytes)
1Ah BYTE implementation identifier of the device
1Bh BYTE implementation revision level of the device
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