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Old 05-13-2008, 10:44 PM   #1 (permalink)
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Join Date: May 2008
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OS: win98,xp,2003


Memory Mapping problem(win98 p4)

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.
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Old 05-15-2008, 02:07 AM   #2 (permalink)
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Join Date: Jun 2006
Location: Woodland Hills, CA
Posts: 2,240
OS: Windows 98se/2000/XP/Vista


Re: Memory Mapping problem(win98 p4)

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
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