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

[rdunlap@atlanta.nsc.com (Randy Dunlap)]

Ingvar's suggestion is a good one.
Your code fragment works with DEBUG under DOS 6.22.

~Randy

|
|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.
|

Ingvar Berg wrote:
|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
|
|
.øç