Al, Thanks for the scans. I have the exact same backplane, un-modified. I think that with all the replies to my thread, and all the digging around that I did, I have a clear understanding of the backplane configuration, what goes where, and how i can modify it for Q22. I will go on to check out the pwr supply before pluging in cards. The only reference I could find to Netcom's chassis configuration that describes the power supplies, is in this document: www.slac.stanford.edu/cgi-wrap/getdoc/slac-tn-80-002.pdF (check page 16 /73) The bus is slightly different (still a serpentine) ABAB only. The '-RL' must mean a backplane with modified slots 2/3 designed to take the RL01 controller. Does anyone have schematics for the Gould (LMGQ- 150/12/5) or Alpha Power (5EXMP) switching power supplies mentioned in that reference? BTW, the correct link to the pictures http://bitsavers.informatik.uni-stuttgart.de/pdf/netcom/photos/ cheers -- alex ----- Original Message ----- From: "Al Kossow" <aek at bitsavers.org> To: "On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Sent: Sunday, October 27, 2013 9:10:20 AM Subject: Netcom HV-1148-RL backplane I scanned the module label and backplane wiring from an 1148-RL that I have that has been modified for 22 bit addressing (it is 18 bit). CD is present only on slots 2 and 3 for an RLV11 and bus grant skips 2CD and 3CD. The scans will be up at http://bitsavers.org/pdf/netcom/pictures as soon as the mirrors pick them up.