Category : C Source Code
Archive   : TC130.ZIP
Filename : IBMTYPE.DOC

NAME
ibmtype -- find out type of computer

SYNOPSIS
r = ibmtype();
int r; r = 0 for PC or XT, 1 for PC Jr.,
2 for AT, 3 for unknown type


DESCRIPTION
This function examines the byte in ROM at F000:FFFEh.
For real IBM computers, this should be:
0xff PC
0xfe XT
0xfd JR
0xfc AT
Many close clones will also encode this byte in the above manner,
although there is no requirement for this feature.

CAVEAT
The results of this test should be taken with a grain of salt
the size of Salt Lake City. Even IBM has shipped XTs with
the PC id byte. The NOVAS AT clone correctly has 0xfc,
but the Z-NIX XT clone (which is a very close clone) has 0x05.
Don't depend too heavily on the results being really accurate.

EXAMPLE
r = ibmtype();
if(r == 2) printf("This machine is an AT, maybe!");





This function is found in SMTCx.LIB for the Turbo-C Compiler