mrchsreddy

Hi All,
I wrote a simple DOS Program to access my ISA Card using far pointer
My ISA Card have resources like 2 I/O s and 1 Memory
My Card is configured to access the location from D000

My program is working(accessing the device memory) in Pentium 1 and not working in Pentium 4

code for accessing ISA device memory:

unsigned int far* BaseAddr;
BaseAddr = (unsigned int far *)MK_FP(0xD000,0x0000);
in P1 processor (Win98)
IO 1 - OK
IO 2 - OK
Memory - OK

in P4 processor (Win98)
IO 1 - OK
IO 2 - OK
Memory - Not mapping to device


thanks in advance.

OldGrayGary

Hi mrchsreddy


Most likely there are no Win98 drivers for the memory controller on the motherboard for your P4, expecially if it is a dual-core model. Win98 also has timing problems with cpus clocked higher than 2ghz - whether single or multi core.

Best of luck
. . . Gary