I would think that any standard VESA Local Bus IDE controller will do.
However, under DOS (which I presume is your target system), there is very little benefit in having a 32-bit controller.

You'll want an EIDE controller, they are of better quality.

My suggestion is the Adaptec AVA-2825 SCSI/EIDE VLB controller. It supports SCSI, EIDE simutanously. it was also the fastest when I benched it
VLB IDE cache controllers, benchmark

I will add that it appears caching VLB controllers are as a rule stuck to pre-EIDE modes for transfers from disk to cache, something an ISA controller could do. They achieve some 13-20 MB/s bus transfers from cache to RAM using 32-bit drivers integrated into their BIOS ROM or installed separately, which is in the range of Mode 4 EIDE if it was implemented well in a VLB controller. They don't even cache ATAPI optical drives or floppy drives, which could've made for a nice little benefit.

i have the exact same 486 motherboard http://www.oldschooldaw.com/forums/index.php?topic=1352.0

is there any VLB IO controller that will support properly ATAPI CD-ROMs????

i have a winbond controller that is supposed to support up to 4 IDE devices
https://cfusion.com/parts/index/NEW_WINBOND_UN-1082VL.html
WINBOND UN-1082VL VESA LOCAL BUS VLB, 4 IDE DEVICES

i may be getting a bit confused (alot of this info in my brain is from half my lifetime ago.. when i was a teenager)

maybe someone can remind me,
do i have to load MSCDEX even if the CDROMS are connected to the UN1082 VLB io controller?
do zip100 internal drives require a DOS driver?

i just found this driver for the actual io controller (un1082VL)
perhaps this is the v1.50 drivers listed in the photos on the page i linked above?
https://cfusion.com/parts/upload/NEW%20WINBON … -1082VL%204.jpg

dual-port IDE Drivers for DOS, Windows, Novell, OS/2 (version 1.50)

does anyone know where i can find the contents of this disk??
theres a file posted on driverguide for the un1082 but it brings up a file for cards with the 83759 chip
and my un1082 has an W83758P chip? (As well as a W93757F which i think is for the floppy controller?)
so it doesnt match up to this W83759.zip that is offered by driverguide .com website
(the only results for searching for un1082vl on google!)

could installing these drivers possibly upgrade the capabilities of my controller to allow it to see cdroms + ZIP 100 drive?
http://www.storagedrivers.com/drivers/73/73635.htm

http://vintage-pc.tripod.com/iomega_zip.html
just found this page..
is this the missing link for me? an ASPI IDE sys driver?

devicehigh=aspippm1.sys /info file=nibble.ilm speed= 1 /info
devicehigh=aspippm2.sys /info file=nibble2.ilm speed= 1 /info

i need this perhaps?
http://www.vogonsdrivers.com/getfile.php?file … &menustate=34,0

could this work? even if the zip100 drive doesnt autodetect by my bios?

is it a general rule that most IO Controllers for 386/486 ISA machines dont support ATAPI devices?
how do i know if my UN1082VL IO controller even supports the ZIP100 connected to it directly?

chrisNova777 wrote:

maybe someone can remind me,
do i have to load MSCDEX even if the CDROMS are connected to the UN1082 VLB io controller?
do zip100 internal drives require a DOS driver?

Yes to both. Only fixed disks won't require a driver under DOS. Everything else does, no matter what controller you use.

do i need to find this UN1082VL driver that properly matches my 83758P chip? (rather then W83759) ??
are those drivers only needed for win95?

when i try to run the dosdrv install.exe for the W83759 installer
it launches a dos app that just freezes on a screen that says
"please wait scanning controller + devices"

There are caching SCSI controllers too:

https://picasaweb.google.com/1077842707711598 … 340610250334674

chrisNova777 wrote:

do i need to find this UN1082VL driver that properly matches my 83758P chip? (rather then W83759) ??
are those drivers only needed for win95?

I believe the drivers for the card are only needed for best performance. Without the driver you won't be able to get the fastest disk I/O (faster PIO speeds, multi-sector transfers, DMA)

I have a couple of VLB cards that I used back in the day with that same Winbond chip. One is the PTI-255W, which has the following ICs on it: W83758P, W83757AF, W83759F. This card has jumpers to select the PIO speed, 600ns, 500ns, 400ns, or 240ns. I recall that it had a DOS config utility called WBIDE.EXE, maybe that would work on your card??

The other card is the Promise EIDE2300plus. It also has three ICs, one being the W83758P chip, but the other two are labeled Promise and SMC. This card has its own ROM which could auto-configure HDDs and bypass limits in the motherboard BIOS (like the 500MB limit on old boards). There are drivers for DOS, Win3.x, and Win95

Unknown_K wrote:

There are caching SCSI controllers too:

https://picasaweb.google.com/1077842707711598 … 340610250334674

I think I know the guy that has this... he's a good egg! 😀