7 Jun
2026
7 Jun
'26
6:56 a.m.
On 6/6/26 18:56, Nigel Johnson via cctalk wrote:
The KA630 will definitely work in a BA23 with a H9278
backplane I have one, but now the BA23 is used for an 11/73.
I also had a QD21 at one time and vaguely remember the
procedure you talk about, which did work for me.
What slot are you putting the QD21 into? Remember the
backplane has ABCD for the first three slots, but ABAB
from there on and the grants must be continuous.
The CPU is in slot 1, the QD21 is in slot 2, A-B
connectors. I have no off-board memory for the CPU at the
moment.
I have an MDB Q22 motherboard that worked years ago, but the
power connection is totally different (screw terminals vs.
AMP pins) and on the opposite side of the card cage (CD side
instead of AB side as on the H9278.) So, making that
motherboard fit in the BA23 would be a challenge.
Well, I am guessing that the QD21 is defective. I'll see if
I can come up with another. The whole aim of this project
is to boot up my old 670 MB ESDI drive, and then backup the
whole drive to an SD card on a SCSI-SD converter.
Thanks,
Jon