The Internal HSD05-AA is working

It's installed and working with a 4 GB Seagate ST34371 on custom clear drive sleds. I don't have a webserver, so the pictures can't go anywhere, but VMS is being installed as we type. Installing a HSD05-AA SBB into a VAX BA4xx series chassis. Parts needed: HSD05-AA SBB (you don't need the trilink or a micro-ribbon terminator) 50-pin internal SCSI cables (2) Power splitters/sheet stock (or real sleds for ISEs) 2x 50-pin M PCB mount pin headers 1x 50 pin M IDC pin header 1x Molex-type 4 position power connector 1x DIN-96 Eurocard-style connector I found most of these supplies in my junk box/parts boards. An oven heated to 375 makes a good if smelly large--scale component removal device. If you can find the DIN-96 (VME type) and one of the 50-pin pin headers in wire-wrap, that would likely make life much easier. To start with: pull apart the HSD05 SBB and remove the PCB. Pull off the white sticker between the 68-pin HD connector and the terminator packs/sockets. Underneath this will be drilled holes for a 50-pin pin header. The board legend indicates pin 1. Clear the holes and solder in one of your PCB pin headers in this position. You're done making modifications to the PCB assembly. Now take your DIN-96, Molex, and other board-mount pin header. This will interface between the DIN SCSI out from the HSD and the 50-pin cable that you will use to carry the SCSI signals in the chassis. If you have RZ-ISE (SCSI) sleds, you can be really slick and feed the SCSI signal into the SCSI traces on the backplane, but we won't do that here. Wire up the Molex first. The signals are as follows (Narrow SCSI-1) Pins 1,2,3 on A,B,C +12v Pins 4,5 on A,B,C +5v DIN SCSI Row A Row B Pin 6 2 Pin 7 4 pin 8 6 pin 9 8 pin 10 10 pin 11 12 pin 12 14 pin 13 16 pin 14 18 pin 15 GND pin 16 GND pin 17 GND pin 18 GND 25 pin 19 NC GND pin 20 GND GND pin 21 32 GND pin 22 NC GND pin 23 36 GND pin 24 38 GND pin 25 40 GND pin 26 42 GND pin 27 44 GND pin 28 46 GND pin 29 48 GND pin 30 50 GND pin 31 NC GND pin 32 GND GND Now how to connect it . . . take one of your SCSI cables and put the IDC pin header in towards the end. In the top part of the BA4(3,4)0 chassis there will be a 50-pin plug that the bulkhead DSSI-0 channel connects to (trace the wires out, there is also the SCSI-IN bulkhead connector in the same area). Unplug this cable, plug in your new cable in the slot. Plug the HSD05 somewhere in the middle (or end), and plug the bulkhead connector in to the new IDC 50pin M connector on the cable - presto, your existing termination works, external DSSI disks/clusters can be set up, and your HSD-served disks can be shared over DSSI should you get another VAX. Of course, if you had the cables to do that, you'd probably have your HSD in a StorageWorks Shelf, but the dream can still live. Plug your other SCSI cable into the adaptor board, and connect up your SCSI disks. "SHOW DSSI" in the VMB should pop them up as RF72s. I have verified this with a RZ21 4GB drive. Note for setup: the HSD05 manual doesn't specifically discuss what the "format" command is, but it is necessary to run it, unlike IRIX or Solaris where it is only used when absolutely necessary.