11/34 up! (sort of)
jacob.ritorto at gmail.com
Thu Jan 29 22:08:17 CST 2015
Thanks, Jon. I tried this simple test via the front panel. It wrote and
read back the memory perfectly, just as I'd entered it.
On Wed, Jan 28, 2015 at 11:49 PM, Jon Elson <elson at pico-systems.com> wrote:
> On 01/26/2015 09:42 PM, Jacob Ritorto wrote:
>> Woohoo, I finally, after over a decade of being somewhat out of the pdp11
>> hobby, have managed to bring back to life one of my pdp11/34s!
>> It's a plain 11/34 with dl11-w, ky11-lb, ms11-L, rl11 and a M9312
>> terminator/boot rom board. I have an emulex controller and some fuji 160s
>> I'll tack on later so I can run 2.9BSD once I get the basic build
>> It's not in great shape at the moment, apparently, as these xxdp 2.5 diags
>> are crashing left and right. But it at least boots the os and tries.
>> I initially had, but mysteriously lost the console emulator/ODT
>> functionality, seems it's starting at 165000 instead of 165200 at poweron.
>> Maybe a 9312 switch mis-set... So I'm booting from the panel by calling
>> the address of the ODT or the rl02 boot rom, which does the trick.
>> Thinking about this problem, I'm wondering if one of the address bits is
> I'm guessing since 165200 seems to work better than 165000, that maybe the
> 200 (octal) bit is stuck on? You could try depositing 1234 to location 0,
> 4321 to location 200, and then read back both locations. If they both read
> 4321, then probably that address bit does not change as the CPU is
> commanding it to. It is also possible that the diag/ODT ROM is not
> sensing the address bits on the Unibus.
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