First post, by CapitanOdessa
Hello!
I've been having an issue with a PCChips M571 board. The issue I'm having is that I can't enable DMA mode in hard disks and use an AWE64 at the same time if I put the FSB at 75mhz.
The specs of the machine:
- Motherboard: PCChips M571
- CPU: AMD K6-2 500mhz running at 450mhz; 2.2v and FSB varying between 66mhz and 75mhz according to the following steps
- RAM: 256MB
- Videocard: Trident somehting
- Additional VIA USB card
- HDD: Two 32GB SanDisk CF Card Extreme
To reproduce the issue, what I did was:
- Install Windows 98 in a blank CF Card with a multiplier of 6X and FSB at 75mhz;
- Start Windows normally;
- Run HDD benchmarks to check the speed of the drive (Tops at 8mb/s);
- Enable DMA mode for the C Drive and restart;
- Run HDD benchmarks to check the speed of the drive (Tops at 33mb/s);
- Shutdown;
- Plug Awe64 ISA card;
- Start up;
- Let it install the drivers and restart;
- Get the error message 'This program has performed an illegal operation and will be shut down.' If I try to see the details, there are only little squares on it. Some times, I get a blue screen that says something about Exception 0E and address 167:SOMETHING. Some times, if I try to see the details I see some corrupted text about run32.dll modules that are failing, or explorer.exe modules that are failing.
If I disable all AWE64 related devices in safe mode, it starts normally
If I disable DMA mode in the C drive, it starts normally
If I set FSB bus at 66mhz, it starts normally
If I unplug the ISA card, it starts normally
Is there anything I can do? Is there anything I'm missing? Or will I have to reduce the speed of the processor in order to boot normally? I used not to have this issue with physical hard drives, but I suspect DMA was never enabled, because I got to know about the setting not long ago with one of Phil's videos.
Thank you in advance!