On Wed, 22 Dec 2010, Glen Slick wrote: Do you have all the patches applied? I know that I couldn't install 2.11 on my PDP-11, as I have Viking QDT card, and it doesn't work without one of latest couple patches. Zane

On Wed, Dec 22, 2010 at 1:42 PM, Glen Slick <glen.slick at gmail.com> wrote: Lacking a manual for the 10276A LSI-11 Interface I made some progress tracing the Q-Bus signals from the card edge fingers of the 10276A through the N8T380N Quad Bus Receivers to the ribbon cable connectors, and then through the 10320C User Definable Interface wire-wrap wiring to the 10269C logic analyzer POD connectors. In addition to the Q-Bus signal outputs of the bus receivers the interface also provides registered versions of BDAL0 - BDAL17 via (2x) 74LS273 and (1x) 74S74 which are clocked on BSYNC. The interface provides unregistered versions of BDAL18 - BDAL21 but does not provide registered versions. Maybe the interface was not designed to fully support 22-bit addressing. If I get around to trying to do anything useful with the interface maybe I'll look at grafting a 74LS175 onto the interface to provide registered versions of BDAL18 - BDAL21 as well. I haven't finished tracing through the logic analyzer state clock generation circuit yet. There are four slide switches to selectively enable/disable generating logic analyzer state clocks on DMA cycles, refresh cycles, read, write, or read-write cycles, and interrupt cycles. One thing that puzzles me is that I can find no connection between the 10276A LSI-11 Interface signal ground inside the 10320C User Definable Interface wire-wrap wiring to the 10269C logic analyzer POD connector signal grounds. I don't see how that would work. Could there be an assumption here that there would be a ground loop between the Q-Bus chassis earth ground and the logic analyzer mainframe earth ground? Just in case anyone is curious here is the signal list that I traced POD connectors. BIRQ 7 JA-1 POD4-3 GND JA-2 BIRQ 6 JA-3 POD4-2 JA-4 BIRQ 5 JA-5 POD4-1 BRPLY JA-6 POD3-10 BDOUT JA-7 POD3-9 BDIN JA-8 POD3-8 JA-9 BSYNC JA-10 POD3-7 JA-11 BIRQ 4 JA-12 POD4-0 JA-13 BIAKI JA-14 POD4-4 GND JA-15 BDMR JA-16 POD3-13 JA-17 BDMGI JA-18 POD3-14 BREF JA-19 POD3-12 JA-20 SSPARE 4 JA-21 GND JA-22 BDAL 21 JA-23 POD3-5 BDAL 16 REG JA-24 POD3-0 BDAL 20 JA-25 POD3-4 BDAL 19 JA-26 POD3-3 JA-27 BDAL 17 REG JA-28 POD3-1 BDAL 18 JA-29 POD3-2 BDCOK L JA-30 SSPARE 3 JA-31 BPOK L JA-32 SSPARE 2 JA-33 SSPARE 1 JA-34 BHALT JA-35 BSACK JA-36 POD3-11 JA-37 BEVNT JA-38 BWTBT JA-39 POD3-15 BBS 7 JA-40 POD3-6 BDAL 0 REG JB-1 POD2-0 BDAL 1 REG JB-2 POD2-1 BDAL 2 REG JB-3 POD2-2 BDAL 0 JB-4 POD1-0 BDAL 3 REG JB-5 POD2-3 BDAL 1 JB-6 POD1-1 BDAL 4 REG JB-7 POD2-4 BDAL 2 JB-8 POD1-2 BDAL 5 REG JB-9 POD2-5 BDAL 3 JB-10 POD1-3 BDAL 6 REG JB-11 POD2-6 BDAL 4 JB-12 POD1-4 BDAL 7 REG JB-13 POD2-7 BDAL 5 JB-14 POD1-5 BDAL 8 REG JB-15 POD2-8 BDAL 6 JB-16 POD1-6 BDAL 9 REG JB-17 POD2-9 BDAL 7 JB-18 POD1-7 BDAL 10 REG JB-19 POD2-10 BDAL 8 JB-20 POD1-8 BDAL 11 REG JB-21 POD2-11 BDAL 9 JB-22 POD1-9 BDAL 12 REG JB-23 POD2-12 BDAL 10 JB-24 POD1-10 BDAL 13 REG JB-25 POD2-13 BDAL 11 JB-26 POD1-11 BDAL 14 REG JB-27 POD2-14 BDAL 12 JB-28 POD1-12 BDAL 15 REG JB-29 POD2-15 BDAL 13 JB-30 POD1-13 GND JB-31 BDAL 14 JB-32 POD1-14 GND JB-33 BDAL 15 JB-34 POD1-15 GND JB-35 JB-36 POD1-CLK GND JB-37 JB-38 GND JB-39 JB-40