Ok, small update. My M8043 (DLV11-J) just arrived today. It seemed in good condition so I confirmed it was set up correctly (9.6k baud and console on J3), built a serial cable from the information provided on gunkies, and put it into my system. Sadly, it behaves exactly how it did with the M8017. No output, no activity on the BRPLY line. I have a hard time imagining that both my M8017 and my M8043 are bad, but it could still be possible. On Thu, May 23, 2019 at 7:38 AM Mattis Lind via cctalk < cctalk at classiccmp.org> wrote:

On 05/26/2019 10:44 AM, Jon Elson via cctalk wrote: Oh, DLV means Q-bus, so there isn't much choice EXCEPT serial console, is there? Yeah, when the serial console doesn't work, you've got a problem. You could check each addr/data line to see that it wiggles. If it doesn't wiggle, then you can see if the state it is in makes sense. Obviously, somewhere in the serial console routine, it should be addressing the serial console, so every line should at some point be in the state to select the console CSR. A logic analyzer set up to read out the bus would be a good tool at this point. Jon

On Sun, May 26, 2019 at 1:03 PM Brent Hilpert via cctalk < cctalk at classiccmp.org> wrote: I spent a good amount of time with the RUN LED issue, but eventually hit a brick wall. I traced the signal from the halt switch all the way into the "Control Chip" on the MCP-1600 chipset (All OK), but since the CPU directly controls if the LED is on or not I was not able to determine why the CPU was not telling the light to go on. Since other signals on the board were looking good (as in it was trying to communicate with other cards on the board), I am assuming that is a secondary issue. On Sun, May 26, 2019 at 11:23 AM Jon Elson via cctalk <cctalk at classiccmp.org> wrote: The only cards I have in my system right now is the M7264 CPU board, and my M8043 DLV11-J (or M8017-AA, which I also have onhand) serial board in the slot closest to the CPU. The M7264 has 4KW of memory onboard, but I don't think the ODT prompt even needs any memory. I haven't gone and checked if any of the lines are shorted when they are not suppose to be, but a number of the pins are shorted with solder bridges on the back side of the H11A backplane. They look like they have been there since this machine was new, I am am assuming that they are intentional. When I get home I will go and check to see if any of the data/addr lines are stuck using my logic analyzer, as well as making sure those solder bridges are where they are suppose to be.