If I remember correctly then the last SCSI HDD needs a terminator. But I am very rusty in this field of HDDs...

Yes, whether the SCSI drive is the only drive, or the last drive in the chain, it _must_ be terminated either by resistor packs built into the drive (if the option is available), or a termination block at the end of the SCSI cable.

IDE should work fine on a 6mhz AT， but you need to run a drive overlay or upgrade the bios （or both). scsi should also work fine. I've done both.

SCSI, even to this day is one of the best hard drive protocols you can buy, with the exception (today) of PCI-E based systems. I have two servers (2003, 2004) that have Ultra 320 drives, which compared to EIDE is a bit less than three times faster.

If you can, SCSI is better than IDE when all else is fair. Yes, SCSI requires a terminator connector, otherwise nothing will work, and even today using SCSI is harder, more complicated, and more expensive than IDE, but if you can pull it off, you will most definitely get better performance, and of course the satisfaction of having a SCSI system in a computer which is just AWESOME.

I used the terminators - and tried 80, 160, and 800 mb HDD's - all they work with common At_286 - like noname AMIBIOS/Harris80c286, but they hanf the AT 5170(

Did you remember to run the at setup disk and disable the bios hdd support?

Anonymous Coward wrote:

Did you remember to run the at setup disk and disable the bios hdd support?

As far as I remember yes, I disabled it in the setup. I'll make another try in few days and write the result then.

In the scsi bios, try the slower transfer rate settings. 5mb/sec

Anonymous Coward wrote:

In the scsi bios, try the slower transfer rate settings. 5mb/sec

Thanks for the advice ! I'll try this !