mob@mit-amt.MIT.EDU (Mario O. Bourgoin) (09/18/86)
I need to control two 10 Megabyte hard disks from one XT. The XT already controls one 10M hard disk using the original IBM controller. I want to add one from an XT that is unused. I have looked at the XT reference manual and the hardware and I can't see a way of controlling an extra disk using it. I also can't see a way of having two controller cards in the XT without contention between them. Can someone suggest either a way of controlling an extra disk with the present controller or adding in a second controller or getting a different controller? Or anything else? --Mario O. Bourgoin
myxm@lanl.ARPA (Mike Mitchell) (09/21/86)
> I need to control two 10 Megabyte hard disks from one XT. The XT > already controls one 10M hard disk using the original IBM controller. The IBM controllers that I have seen were made by XEBEC. These controllers have the capability of running two hard disks. You can tell if your controller will do this by looking at the place where the cables connect to it. You should see three rows of staking pins. One should be 34 connecters and the other two should be 20. If your controller is set up like this then all you will need are the cables to hook up the drives. The 20 position cables have nothing special to them. They run straight through. The 34 position cable has a twist in it going to drive D (similar to the way the floppy cable has a twist in it going to Drive A). The positions involved in the twist are: 34 26|16 18 20 22 24|14 2 CABLE POSITION D 34 26| 17 19 21 23 |14 1 | | | | \ \ \ \ 1/2 twist / / / / 34 26|24 22 20 18 16| 2 34 26 23 21 19 17 1 CABLE POSITION C Hope this helps. Mike Mitchell myxm@lanl.arpa
raymund@sci.UUCP (Raymund Galvin) (09/22/86)
In article <7739@lanl.ARPA>, myxm@lanl.ARPA (Mike Mitchell) writes: > > I need to control two 10 Megabyte hard disks from one XT. The XT > > already controls one 10M hard disk using the original IBM controller. > > The IBM controllers that I have seen were made by XEBEC. These controllers > have the capability of running two hard disks. You can tell if your controller > will do this by looking at the place where the cables connect to it. You > should see three rows of staking pins. One should be 34 connecters and the > other two should be 20. If your controller is set up like this then all you > will need are the cables to hook up the drives. The 20 position cables have > nothing special to them. They run straight through. The 34 position cable has > a twist in it going to drive D (similar to the way the floppy cable has a > twist in it going to Drive A). ......... > Hope this helps. > > Mike Mitchell > myxm@lanl.arpa I hooked two 10M drives to the XEBEC controller in an ITT XTRA. The cable twisting was avoided by setting the second hard disk to respond as drive 1 - not drive 0. I believe the twist in the cable is used so both drives can be configured as drive 0. Ray Galvin
wjr@rayssd.UUCP (Bill) (09/28/86)
> I need to control two 10 Megabyte hard disks from one XT. The XT > already controls one 10M hard disk using the original IBM controller. > I want to add one from an XT that is unused. I have looked at the XT > reference manual and the hardware and I can't see a way of controlling > an extra disk using it. I also can't see a way of having two > controller cards in the XT without contention between them. > > Can someone suggest either a way of controlling an extra disk with the > present controller or adding in a second controller or getting a > different controller? Or anything else? > > --Mario O. Bourgoin I haven't done this my self, but I know IDEA is able to do this with their external hard disks. Would you please post when you find out though?? Thanks and Good Luck, Bill