SCSI and IDE hdd in a pc?
Posted by whomstdve43@reddit | vintagecomputing | View on Reddit | 14 comments
I’m trying to configure my 386 with this scsi card pictured. I currently don’t have a working scsi drive so I am trying to boot with my ide drive. Without this card in the system everything works as usual. With the card plugged in I get a hdd failure as pictured. Does anyone know how to configure both ide and scsi in the same system and to boot off of ide?
flama12333@reddit
its seem to be Genoa Unknown 486
is possible to extract bios rom to see if is match or not?
toastli@reddit
DPT controllers were primarily RAID controllers. I recommend an AHA-1542xx if you are booting SCSI to MS-DOS.
Vogons has a thread covering DPT.
https://www.vogons.org/viewtopic.php?t=37674
jruschme@reddit
Is this the one that treats all the drives as one big RAID-0 array?
CornerProfessional34@reddit
The one resister bank populated, three empty looks sketchy to me to the right of the Emulex chip. All in or all out. Meanwhile I have not read the online manual yet.
TerminalCancerMan@reddit
Anyone else old enough to remember "Fuzzy SCSI loves everybody"?
computix@reddit
On theretroweb.com site it shows this card as a DPT PM2011/90. However, looking at the actual uploaded manual, I'm not convinced, the jumpers look different.
That said, in that manual it clearly shows these cards can be configured on IO ports that overlap with IDE (0x1F0 through 0x1F7, and 0x170 through 0x177). It also shows it can use IRQ 14, so that also overlaps IDE.
This card also appears to have a floppy controller that should also be disabled if you already had a floppy controller on another I/O card.
In general this card is made to build a SCSI-only system, with the card taking care of all I/O. According to its manual its configuration probably isn't flexible enough to be easily installed in a system with a IDE, though looking over it, it might be possible.
Retroweb. Unfortunately the jumpers in the manual don't seem to match your card perfectly, but I suspect it's similar enough that the conclusions above still make sense.
whomstdve43@reddit (OP)
The drawing on the retro web and stason are wrong. The jumpers line up better to the ones on the eisa version jumpers on stason
glencanyon@reddit
I would says the same thing. Maybe the Stason jumpers are better? I would think you would want to configure the SCSI to use 330h.
computix@reddit
Even if you disable the ROM, the I/O conflict will still cause problems.
Setting it to 330 may work, but those are popular ports, you can easily have another card in the system that uses them, for example an MPU on a sound card. I didn't want to make my comment too long, but the other I/O port selections listed in the retroweb manual all have their own problems, hence my statement that this card is most suitable for a SCSI-only system.
The_WolfieOne@reddit
So there is a 40 pin connector labeled IDE on that adapter?
If there is make sure your IDE drive is set to Master even if it stand alone .
Most SCSI of that vintage was 50 Pin IIRC.
I only ever worked with Adaptec SCSI cards in the day, and none of them had IDE controllers. Do you have the full specs for that controller?
whomstdve43@reddit (OP)
There’s no ide on the scsi card. The two upright set of pins are for floppy and scsi, the rest are for daughter boards
Adorable-Cut-4711@reddit
As others have stated, this seems to be one of those hard disk cards that use the same I/O ports as the regular PC/AT MFM and IDE interfaces.
A possible work around could be to either use the second port on an IDE card with two ports, or modify an IDE card to have a non-standard address, and use either of those in conjunction with a properly configured XTIDE Universal BIOS which I think can be set to have the IDE interface at more or less any I/O address.
It would probably be a bit fiddly to modify an IDE card, but you more or less have to invert one or more of the address lines, using a fast enough inverter chip, to change it to use some non-standard I/O port.
Another solution would be a sound card with an IDE port with an unusual I/O port address, and also use that together with XTIDE Universal BIOS.
Not that although it has XT in it's name and it originally was developed for 8-bit ISA cards, the XTIDE Universal BIOS supports regular AT/ATA/PATA/IDE style controllers, and that is what you want to use here.
Btw if your goal is to temporary be able to boot the computer from "something else" while experimenting, XTIDE Universal BIOS can also help out, as it has a way to boot from a serial port (!) emulating a disk over a serial port. It's obviously slow, but less than 10x slower than floppy, so at least you won't grow grey hair while it's booting.
rpocc@reddit
Probably you have to adjust addresses with jumpers and disable built-in HDD controllers if present.
Psy1@reddit
Does the SCSI card have an option to disable its ROM? This makes things much easier as you then have your boot IDE drive bring up the SCSI with drivers in the OS.