Posted by Kory Spansel on 2000-11-20
Hello,
I'm curious as to when the information in the Bios Data Area is
initialized. I have some code that is loaded from the boot sector of a disk
and the code checks to see whether or not a math-coprocessor is installed.
I'm not sure if my code is incorrect or if the information in the bios data
area is not yet initialized. Because when i run this, it says my computer
doesn't have a co-processor (which it does). Here's what I have:
mov ax, 40h
mov es, ax
mov di, 10h
mov al, es:[di]
;al contains low byte of equipment flag bit 1 = math coprocessor bit
and al, 2
shr al, 1
cmp al, 0
je nocoprocessor
;A coprocessor is installed
nocoprocessor:
;No coprocessor is installed
The problem is that I made a test program that uses this code and it
correctly finds the math co-processor on my other computer. I don't know
what's up, any ideas?
Also does anyone know an algorithm to print the value of a register in
decimal form?
Thanks,
Kory
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