8 Jun
2026
8 Jun
'26
11:35 a.m.
On 2026-06-08 11:29, Jon Elson via cctalk wrote:
On 6/7/26 11:30, Nigel Johnson Ham via cctalk wrote:
I'm not sure about different terminators, I have used both KA630 and
11/23, 11/73 in this backplane.
I know I have seen that exact error, 400 instead of 200, but I cannot
remember what it meant or how I got around it. This is really bugging me!
Unless I find any old notes I don't think I can help any more :-(
cheers
Nigel
--
Nigel Johnson, MSc., MIEEE, VE3ID/G4AJQ/VA3MCU
Amateur Radio, the origin of the open-source concept!
Oh what a mangled head received when first we fractals do perceive
Does the QD21 have the 22-bit addressing kit installed in U49, with
switch 2-6 ON?
Yes, the U49 IC is there. SW2 position 6 is on.
Are SW2-3-4 all set to zero for standard CSR?
Yes, and the CSR does show up at the right address.
Does the BA23 have the bus terminators installed?
AHH, now this could be the cause! I saw in some manual that different
terminator SIPs are required for uVAX vs LSI-11. The ones in there
are marked 13-18110.
Are the QD21's three lights are going out?
LED3 stays on = controller idle, waiting for init.
Do you have the full manual?
Yes.
Have you tried auto booting?
I do not want to connect the drive until the controller has been
properly configured for that drive model, as I want to get the data
off it.
Anyway, the issue is that when I do the last deposit of the load
diagnostic procedure (D/P/W 2000146A 4401) and then examine the
response (E/P/W 2000146A) I am supposed to get 0400 but instead I get
0200. That is not listed as a known error code in the manual. Most
specifically, it is not 0051 (FRD load to memory failed).
Thanks for any suggestions!
Jon