View Full Version : SCSI Adapter 16 bit ISA for PC-XT

August 19th, 2010, 09:18 AM

Does anyone know if there is a SCSI Adapter 16 bit ISA what works in a PC-XT??


August 19th, 2010, 09:28 AM
Not to the best of my knowledge. However, some 16-bit sound cards included an 8-bit (capable) SCSI adapter.

Anonymous Coward
August 19th, 2010, 11:43 AM
I suspect some models of the Future domain 16-bit cards might work in 8-bit slots, but I've never been able to test.

August 19th, 2010, 12:41 PM
I suspect some models of the Future domain 16-bit cards might work in 8-bit slots, but I've never been able to test.

I can confirm that. Use to run a Toshiba T5200 with a 1Gb SCSI drive controlled from a Future Domain card fitted into the 8bit slot. As to which model it was, I'm not sure. Possibly a TMC-16xx ??

August 19th, 2010, 12:54 PM
I've got a Future Domain card (a TMC-885 IIRC) which has a 16-bit ISA connector, but the only connections to the 16-bit part are the interrupt lines. So if you set it to a low-numbered IRQ, it'll work in an 8-bit slot.

Since it's numbered in the 800 series rather than the 1600 series, this may not count as a 16-bit card, of course...

August 19th, 2010, 01:31 PM
I'd certainly count it as an 8-bit card--it can't do 16-bit programmed I/O or DMA. On the other hand, my TMC-1650 refuses to work in an 8-bit slot, no matter what.

Maybe we need to qualify what we mean by "16 bit". I've got tape controllers, for example, with the two edge connectors, but there's no way I'd call them "16 bit cards", as they can't do 16-bit I/O. On the other hand, I've got a couple of network cards that can go either way (i.e. 16-bit or 8-bit I/O, jumper-selectable).

For example, the Media Vision Pro Audio Spectrum 16 with SCSI interface used an NCR 5380 host adapter chip, which is an 8-bit interface. This, even though the PAS-16 sound part is true 16-bit.

August 19th, 2010, 01:54 PM
According to TH99, the TMC-885 is clearly an 8 bit card. John - perhaps you meant a different card.

Anybody who advertises a card as being 16 bits when it doesn't have a way to do a 16 bit data transfer should be sentenced to hard labor.

Agent Orange
August 19th, 2010, 02:04 PM
Ebay has a Trantor T130B SCSI 8-bit controller for about $40. I think that's too much as I paid about $10 for mine. The T130B will work with the XT/AT as well as the 1000SX. All of the pertinent setup info is on the silk screen and Microsoft still has a support page available for it.


August 19th, 2010, 03:32 PM
Just came across this one on Ebay...


Its a full ISA card but looking at the 16bit extension, none of the upper data lines are being used. Probably only making use of the extra IRQs.