Anonymous Coward
Veteran Member
Is there anybody in this forum that has experience using dual video adapter systems? I am trying to assemble a 486 system using this setup, but I seem to be having some difficulties. The reason I would like to use two cards is because I would like to use one as a windows video accellerator, and the other as a DOS VGA graphics only card. There are very few single cards that are fast at doing both. I've tried just about everything except for maybe a P9000 and an S3-964. Anyway the system I am building is mostly EISA. This is because I wish to run my BUS at 50MHz. This means that I don't really like using local bus cards. However, I have decided to use a VLB adapter for DOS modes, because of ISA memory addressing restrictions. I am currently using a Hercules Dynamite Power VLB as my DOS card, which has a reputation for being able to handle the 50MHz bus. So far I have not encountered any stability issues. However, in the Hercules manual I discovered that this card has some issues co-existing with other graphics adapters since it is a memory address hog. Does anyone know of another ET4000W32p card that does not suffer from these problems? So for now I have ruled out the possibility of using another accellerator as a secondary adapter. But, I then learned it is possibe to disable the VGA BIOS on some of the higher end cards and feed the signal in through the VGA feature connector. I purchased an ELSA Winner 2000 4MB EISA adapter so I could try just that!!! The only problem is that I can't seem to get the damn feature connector on the ELSA card working. I read on the newsgroups that some cards do only output or input, but often not both. I am pretty sure my hercules card is output only, but I am not sure about the ELSA. I would hope that it does input, since that is what I need. So basically I need to find out how to get the damn feature connectors working.
Also, while I was fooling around with my system I enabled the VGA BIOS on my ELSA just for the hell of it (using a secondary address), and I discovered that my system would boot under this configuration. I also discovered that I could load windows on the secondary display adapter with the ELSA driver. However, when I try to run the ELSA controller panel, the display cuts out. However, the system does not crash. I am able to ALT-F4 back to the DOS prompt which appears on my primary display. I also discovered that after running some DOS programs, sometimes my machine locks up when I attempt to run Windows on the ELSA. This leads me to believe that there is a memory address conflict between my two cards. This is probably fault of the damn hercules!!! I need to know if there is a way to determine which addresses are being used by my display adapters...and then I need to figure out if it is possible to modify the ranges they are using. If it helps, my ELSA card uses an S3-928 chipset.
If anyone has any recommendations for me for a VLB card that is as fast as my Hercules Dynamite Power that can function at 50MHz, and co-exist with another graphics adapter I would really like to know. I would prefer a card with a feature connector that works in both directions.
Thanks.
Also, while I was fooling around with my system I enabled the VGA BIOS on my ELSA just for the hell of it (using a secondary address), and I discovered that my system would boot under this configuration. I also discovered that I could load windows on the secondary display adapter with the ELSA driver. However, when I try to run the ELSA controller panel, the display cuts out. However, the system does not crash. I am able to ALT-F4 back to the DOS prompt which appears on my primary display. I also discovered that after running some DOS programs, sometimes my machine locks up when I attempt to run Windows on the ELSA. This leads me to believe that there is a memory address conflict between my two cards. This is probably fault of the damn hercules!!! I need to know if there is a way to determine which addresses are being used by my display adapters...and then I need to figure out if it is possible to modify the ranges they are using. If it helps, my ELSA card uses an S3-928 chipset.
If anyone has any recommendations for me for a VLB card that is as fast as my Hercules Dynamite Power that can function at 50MHz, and co-exist with another graphics adapter I would really like to know. I would prefer a card with a feature connector that works in both directions.
Thanks.