RE: checking for the presence of PCI BIOS...

[ingvar_berg@x400.icl.co.uk]

Jasper Balraj wrote:
>We tried to execute the following code segment to find out whether
>PCI BIOS was present using debug.exe, thru the DOS prompt of '95. We
>didn't get any expected result, as our PC had PCI BIOS.
>
>mov ah, b1
>mov al, 01
>int 1a
>-->     nop
>mov ah, 4c
>mov al, 01
>int 21
>
>We would like to know whether debug could be used for this purpose and
>if any body could tell us the right way of doing it at a low level like the
>one shown above, we'd appreciate it.

You should try it using plain DOS without any memory manager installed. 
It's the easiest way to assure real mode operation, to let the 'int 1a' 
instruction execute as intended. With a memory manager installed, or 
executing in a 'DOS-box' means that the interrupt is trapped and 
possibly not let through to BIOS.

/Ingvar
-0