On May 25, 2021, at 11:54 AM, Glen Slick via cctalk <[email protected]> wrote: > > On Tue, May 25, 2021 at 10:54 AM Zane Healy via cctalk > <[email protected]> wrote: >> >> One odd thing is that the KA640-A seems to plug into another board, before >> the DSSI drives. I’m getting ready to dig into that, and find out what that >> board is. >> > > Is that an M9715 board plugged into the backplane between the CPU > board slot and the power supply, or something else? > > Or is there a cable plugged into the DSSI connector on the M7624 KA640 > adjacent to the memory bus connector that plugs into a some board and > stops there, and then another cable from that board to the DSSI > drives? Do the DSSI drives plug into the backplane, or do they have > cables connecting to them?
It turns out that the oddness was the CPU Board, and a 16MB Clearpoint RAM board. What I thought was the CPU, is really the header panel over the RAM and TK70 controller. There is also a M9715 between the CPU and the powersupply that I’d missed seeing. The cables to get to the DSSI connector by the Powersupply are hanging out the front. Basically it’s a cable going from the KA640 to a ribbon cable to a cab kit, then DSSI cable from that to the connector next to the power supply. I disconnected the DSSI cable from the KA640 (M7624), and got the same errors. The more I play with this, the more I like the chassis, and the more I want to get it going. This chassis is definitely better than the 3rd party rack-mount chassis that my MicroVAX 3 lives in. If it was working, it would simply need my RLV12 moved to it to be perfect. At this point, I’m suspecting an issue with the KA640 board. Zane
