On Wed, Apr 29, 2015 at 3:58 PM, Noel Chiappa <jnc at mercury.lcs.mit.edu>
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
disabled; several Dl11-W's, and the line clock signal may get overloaded.
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.
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.)
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 :)).
And I just realized you're working with a -YB, and I've been dis-assembling
the -YA! Fat lot of use that would have been! Oh well, I assume the code is
fairly similar, I'll do the -YB next. (Anyone have a dump, to start me
comparing the diagnostic/console PROM listings to
what I have
Where were those from? Thanks in advance...
See the link above. I was assuming that the console emulator code was at
least *similar* to that on the YB, I never did find actual listings for the
YB. (At any rate, the code at the entry point in my ROM is an invalid
instruction so that's evidence enough for me...)
From: Henk Gooijen
I could be wrong, but ISTR that in the first few
words of a ROM are
two capitals of the boot device that the PROM
Not in the M9301-YA, in either bank.
This appears to be true for the M9312 from what I've read.