KVC@ENGVAX.UUCP (Kevin Carosso) (03/12/86)
I asked info-vax several days ago about adding an extra UNIBUS to an IDTC equipped 8600... We did this successfully, and since I only got one response from the net, I figure no one else knows the answer, so I thought I'd let you all know what happened. It turns out that there is actually room for 3 UNIBUSes in an 8600 CPU cabinet. There's the UBA that goes to the drawer in the frontend cabinet, the IDTC which is a UBA and UDA-50 and TU-81 controller slipped into a special set of slots at the far right, and a regular four board options slot between the two where the UBA boards from my 785 slid right in! (the slots are labelled with the module numbers for a DW780, so you can't miss 'em). So, we've got a total of 3 UNIBUSes (at TR 3, 4, and 5) without going into the expansion cabinet. There's still room for another SBI interface and a CI interface in the cabinet. I don't know why the VAX System Options and Summary calls one UBA a DW780-MA and the other a DW780-MB, nor why it isn't clear about the fact that an IDTC does NOT use up your second UNIBUS slot, but that's about par for the course for the VSOS. /Kevin Carosso engvax!kvc @ csvax.caltech.edu Hughes Aicraft Co.