29 Apr
2015
29 Apr
'15
5:14 p.m.
On 4/29/2015 4:11 PM, Josh Dersch wrote:
I'm now running off of a M9312, and there is a TU-58 boot PROM for that
(see here: http://ak6dn.dyndns.org/PDP-11/M9312/). I believe I have a set
of compatible PROMs and I'll probably try that tonight, if I can find the
time (and the DL11 :)).
The 'ZZ' (my notation) for the M9312 is also a useful addition for debug/sanity
checking.
It goes in like a device prom, but just runs the simple M9312 console
diagnostics and low
memory (28KW or less) memory test continuously. Image available on the link to
my website
above, or contact me directly and I can provide a preprogrammed device. Same for
the TU58
(or other) boot proms.
Don
On Wed, Apr 29, 2015 at 3:58 PM, Noel Chiappa <jnc
at mercury.lcs.mit.edu>
wrote:
That's good to know, thanks. I do have a spare DL11 in my stash of spare
boards, I just need to find it, it appears to have gotten misplaced during
my house move last year. Not sure if it's a -W or not.
I've had two DL11-W in my 11/34A BA11-K box for years and have never had an LTC
issue.
I suppose if you had a a larger number (say four or more) you might possibly see
an LTC
issue, but I never have with just two. In any event you could completely
disconnect the
LTC circuitry on the DL11-W by removing just one inline series resistor.
From:
Jorg Hoppe
I also have a spare DL11-W to offer
Josh, if you want a second serial line, it's best to use a regular DL11
(M7800), not a DL11-W. (M7800s are available on eBay, for pretty modest
amounts.) The reason is that each DL11-W presents a load on the line clock
signal (from the power supply), even if the line clock on the second board
is
disabled; several Dl11-W's, and the line clock signal may get overloaded.
From: Josh Dersch
I need to scare up a second SLU so I can get an
emulated TU-58 hooked
up to try booting XXDP
I'm not sure any M9301 variant supports the TU-58? Some are set up to boot
over the console serial line, though. (I haven't yet checked the code, so I
don't know whether you need to feed it the absolute loader first, or if it
will just take .LDA files directly.)