smc8516@isc.rit.edu (S.M. Curtin) (01/17/91)
A friend of mine recently got an old Xetec hard drive system for the 64 or 128 and wants to hook it up to his 3000. Apparently, some sort of SCSI converter plugged into the 64 and went to the HD box via a 25 pin cable and was switched internally to a 50 pin standard SCSI ribbon. It then goes through an Omti SCSI to ST-506 converter board and into a standard 40 meg st-506 style drive. The unit also has its own power supply. We've bypassed the external 25 pin connector on the back of the Xetec box and gone straignt to the 50 pin internal. (The 25 pin was VERY nonstandard). I ended up making a special cable to go from the 25 pin external SCSI connector on his 3000 to a 50 pin header female. (Pressing each wire into the crimp things individually, I might add). We're sure the pin assignments are right and the contacts are good in the cable as we checked it thoroughly. The problem is we have no documentation on how to set the Omti board. It has about 10 or 12 jumpers down one side of it, and one 3 pin jumper (dual shorting block position) right next to where the 50 pin connects. We need to know what to set these jumpers for to get it working with the 3000. I assume the row of 10 or 12 is for SCSI device# select, though I thought only 7 devices were available in SCSI systems. What are the extras for? We have all of the specs on the drive to enter into HdToolbox. (Cylinders, write precomp, heads, etc) Is there anything else we need to do? ...Sean. ------------------------------------------------ My Usenet pet peeve: there != their != they're ------------------------------------------------
billsey@agora.rain.com (Bill Seymour) (01/30/91)
In article <1991Jan16.221022.14154@isc.rit.edu> smc8516@ultb.rit.edu (S.M. Curtin) writes:
:
:A friend of mine recently got an old Xetec hard drive system for the 64
:or 128 and wants to hook it up to his 3000. Apparently, some sort of
:SCSI converter plugged into the 64 and went to the HD box via a 25 pin
:cable and was switched internally to a 50 pin standard SCSI ribbon. It
:then goes through an Omti SCSI to ST-506 converter board and into a
:standard 40 meg st-506 style drive. The unit also has its own power
:supply.
If I remember right, those old Xetec drives for the 64 were SASI.
not SCSI. There is a very good chance that many of the base SCSI commands
that his 3000 uses aren't implemented in that old SASI interface. Probably
what he'll need to do to get it all working is replace the OMTI (didn't
say which number) with either a newer OMTI (7x00 or 3520) or an Adaptec
(ACB-4000A or ACB-5500). Either of those should work fine, and there's a
chance that the HDToolbox software may even recognise it. If not, you can
format on someone elses machine, then just use it on the 3000.
:...Sean.
:
:------------------------------------------------
:My Usenet pet peeve: there != their != they're
:------------------------------------------------
Their're you go! :-)
--
-Bill Seymour billsey@agora.uucp or billsey@agora.rain.com
***** American People/Link Amiga Zone Hardware Specialist NES*BILL *****
Bejed, Inc. NES, Inc. NAG BBS NES BBX BBS Home Sometimes
(503)281-8153 (503)246-9311 (503)656-7393 (503)640-9337 (503) 640-0842jesup@cbmvax.commodore.com (Randell Jesup) (01/31/91)
In article <1991Jan29.232823.24617@agora.rain.com> billsey@agora.rain.com (Bill Seymour) writes: > If I remember right, those old Xetec drives for the 64 were SASI. >not SCSI. There is a very good chance that many of the base SCSI commands >that his 3000 uses aren't implemented in that old SASI interface. Probably >what he'll need to do to get it all working is replace the OMTI (didn't >say which number) with either a newer OMTI (7x00 or 3520) or an Adaptec >(ACB-4000A or ACB-5500). Either of those should work fine, and there's a >chance that the HDToolbox software may even recognise it. If not, you can >format on someone elses machine, then just use it on the 3000. I doubt that HDToolBox can deal with formatting an Adaptec ACB-4000A or 4070A. We looked at it a bit originally, but when we hit a wall we canned it. The problem is that it requires a highly non-standard MODE_SELECT command to tell it what the drive is (HIGHLY non-standard). You can use scsidirect to do the initial format from a program, and from then on HDToolBox should be able to deal with it. -- Randell Jesup, Keeper of AmigaDos, Commodore Engineering. {uunet|rutgers}!cbmvax!jesup, jesup@cbmvax.commodore.com BIX: rjesup The compiler runs Like a swift-flowing river I wait in silence. (From "The Zen of Programming") ;-)