Ah, well there you see the end of my technical knowledge. When the 11/83 came out, I was already a manager :-)
Thanks for the info, I will try it and report back! cheers, Nigel ps, No way is it PMI mmeory, it is waaay too old! On 2021-10-19 11:03 p.m., Chris Zach via cctalk wrote: > It can be done, technically the 11/83 and 11/93 put the CPU in slot 3 > with the PMI memories in slots 1 and 2. Putting the CPU in slot one > with the PMI memory in 2 and 3 would just cause all memory access to > slug across the Q Bus. > > So you can leave slots 1 and 2 open if you really want to, makes it > easier to deal with possible PMI screwage (I always wondered if one > could put a CPU in slot 1, then the M8013/8014 RL01 controller in > slots 2/3 but I don't remember if the 813/8014 will work in a 22 bit > unit without catching fire or something). > > Anyway, just try running the CPU in slot 3, then the memory in slot 4, > and the DLV11J in the right side of slot 5. That would simplify things > as much as possible. > > C > > * PS: Right now I'm running my 11/83 in slot 1 with a 2mb PMI memory > board in slot 2 and the TK70 controller in slot 3. The reason is that > the PMI memory board is from an 11/84, and it has the bug that > prevents it from working properly in a true Q Bus system. > > I *think* the bug is related to concurrent memory access from both the > Q Bus DMA and PMI bus as just using the memory as a Q Bus memory has > no problems. A true 11/84 works because there is nothing on the Q-Bus > as all memory access is done through the Unibus bridge thingie which > only does memory transfers on the PMI bus (it's not a true Quniverter > for DMA purposes). > > I also *think* the bug is related to burst mode DMA as I have run my > ESDI controller in normal DMA mode (slower) with the PMI memory > running as PMI without problems. However if I turn on burst/hog mode > DMA it will crash RSX11 (but not RT11). Go figure. > > > > On 10/19/2021 8:50 PM, Nigel Johnson Ham via cctalk wrote: >> In all the hundreds of systems I have shipped, I have never put the CPU >> in slot 3! I was VP Operations of Transduction, DEC's biggest components >> group OEM in Canada. >> >> No, I don't know if the CPU is good (it is a dual-width KDF11-A btw), >> but it is in slot 1 AB with a DLV11J in slot 2AB. The memory has been >> in slot 3 as well as lower. Since there is nothing above or below it on >> the CD side there cannot be any interference in the CD connectors. >> >> I do have an 11/73 dual width board arriving tomorrow so will see if I >> get the same results with it. >> >> Thanks for reading, >> >> Nigel >> >> >> On 2021-10-19 7:55 p.m., Chris Zach via cctalk wrote: >>> Hm, ok all my Plessy boards are dual height, 1mb boards. Are you sure >>> the 11/23+ is working, and do you have the CPU in slot 3 with the >>> memory board in slot 4 (staying away from the PMI slots)? >>> >>> C >>> >>> On 10/19/2021 6:51 PM, Nigel Johnson Ham via cctalk wrote: >>>> It's just a memory board and looks like one! >>>> >>>> Picture here: >>>> >>>> https://www.mediafire.com/file/ive7i7ax6zdibv3/Screenshot_20211019_185019.png/file >>>> >>>> >>>> >>>> cheers, >>>> >>>> Nigel >>>> >>>> >>>> On 2021-10-19 5:21 p.m., Chris Zach via cctalk wrote: >>>>> Sounds familiar, got a picture of the board somewhere? >>>>> >>>>> C >>>>> >>>>> On 10/19/2021 12:57 PM, Nigel Johnson Ham via cctalk wrote: >>>>>> I am trying to bring up an 11/23 system in a BA23 box, and the only >>>>>> memory i have is an obscure Plessey one. The only identification is >>>>>> the >>>>>> p/n 705920 with dash-100 in white ink. By counting the chips I >>>>>> make it >>>>>> 4MB, but it does not respond. Since it takes the full 22-bit memory >>>>>> space I can't see how any jumpers would change its accessibility. >>>>>> Does >>>>>> anybody have a manual? >>>>>> >>>>>> any help appreciated, >>>>>> >>>>>> Nigel Johnson >>>>>>
