From: John E. Malmberg [wb8tyw@qsl.net] Sent: Thursday, September 21, 2000 9:51 PM To: Info-VAX@Mvb.Saic.Com Subject: Re: Changing Alpha 2100 SCSI backplane "Jack Peacock" wrote in message news:e3yy5.12262$nk3.579113@newsread03.prod.itd.earthlink.net... > I have an early Alpha 2100 with one internal storage shelf. Currently > the shelf is wired to the motherboard SCSI controller as one backplane, > set up for 5.25" drive spacing (as originally shipped with RZ74s from > factory). There is no setup to use 5.25 drive spacing. There is a default address for each slot that can be overridden by the drive cartridge. Spliting the backplain should be easy. I do not remember the exact procedure as all of my 2100s of that type left a few months ago. If you remove the shelf and look at the back, you should see a jumper and a terminator. I think if you remove the jumper and attach a second terminator, you should be able to connect it up. The shelfs alternate between the two buses. As I recall it appeared pretty obvious at the time from looking at the back of the shelf. I also converted a few of the machines to use the fast-wide shelves. With the internal SCSI, plus three channels on the remaining three sections. > An old machine but well built and it's all mine now. I'd like to take > advantage of more of the internal hardware, especially the Mylex RAID > controller. It's slow by modern standards but it's fast enough for me, > and I'd take it over a Multia any day. I hope to preserve it for many > more years. If you are running hobby OpenVMS on it, you only get one processor. Good luck. Make it a point to remove the right side panel on at least an annual basis to remove any dust that accumulates in the power supply fan. Watch for compatable memory boards to start showing up on the used market :-) -John wb8tyw@qsl.network