cube1 at charter.net
Mon Aug 17 21:48:08 CDT 2015
BR level is the bus request level for an Interrupt. BR 4 is typical.
The RLV11 apparently asserts BIRQ L, pin AL2 - which on the 11/23 would
be BIRQ4 L. I don't think the RLV11 offers any other choice.
The RLV11 print set (bitsavers) has the switch settings on page 4 of the
The RLV11 controller manual can be found at:
The RLV11 was developed for the original LSI Bus. I'd expect it to be
Q-Bus compatible, but others here probably have more recent exposure.
It has been a while since I worked with an 11/23.
Have you tried manually examining the CSR to see what it shows? Does it
Have you tried a CSR of 774400, which might be its address on your machine?
On 8/17/2015 4:43 PM, Ben Sinclair wrote:
> Now that I (hopefully) have my PDP 11/23 running (it passes CPU and memory
> tests, anyway), I've been messing with my RLV11 so I can use my RL02.
> For a first step, I'm trying to run the VRLBC0 diskless diagnostic to check
> the controller. I checked that the address and vector switches are set to
> the defaults according to he manual, and also verified them with a
> The manual says the default vector address is 330, though the diagnostics
> default to 160. I tried it both ways with the same result, though I should
> be on 330.
> I'm not actually sure what "BR LEVEL" refers to, so I left that at the
> This is a PDP 11/23 with an H-9273 backplane. I have the M8186, M8067,
> M8043, then the two RLV11 boards, M8013 and M8014, then an M8012.
> Here's a sample run. It appears to start, but never does anything else. If
> I give it a bad address it does complain, so I think I have the switches
> Does anyone know what I might try next? Thanks!
> .R VRLBC0
> RLV12 DISKLESS
> UNIT IS RLV12, RLV11, OR RL11
> RSTRT ADR 145702
> CHANGE HW (L) ? Y
> # UNITS (D) ? 1
> UNIT 0
> RLV12 (L) Y ? N
> RLV11 (L) Y ? Y
> CSR ADDRESS (O) 174400 ?
> VECTOR (O) 160 ? 330
> BR LEVEL (O) 4 ?
> CHANGE SW (L) ? Y
> ERROR LIMIT FOR AUTO-DROP (D) 0 ?
> ALL REMAINING QUERIES ARE FOR OPTIONAL (MANUFACTURING)
> G5388 TEST-LOOP-MODULE SET-UP. USE <^Z> TO BYPASS.
> G5388 TLM INSTALLED (L) N ? N
> MMU AVAILABLE
> MEMORY SIZE 124 KW
> 18 BIT ADDRESSING
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