27 Sep
2007
27 Sep
'07
1:44 p.m.
Dave McGuire wrote:
On Sep 27, 2007, at 2:59 PM, Don North wrote:
One would think that this is it, but alas it is not :-(
I did a download and disassemble, and it is just a copy of the DU
(23-767A9) boot prom image.
In fact, download both 23-767A9 and 23-E39A9 and compare them; they
are EXACTLY the same image.
I believe this happened because there is an image named
23-E39A9.hex/bin floating around
various sites that actually is just 23-767A9 (DU, MSCP boot) renamed.
Crap.
Source code to that ROM has to be around somewhere.
-Dave
I dunno, I think it was saved on /dev/null from all that I can tell.
Even if a binary exists it is easy enough to disassemble and recreate a
source.
I have a version that I have recreated (from the logic in the SIMH TMSCP
driver boot
code) but the smallest I can get it down to is 5 words too large for the
available
ROM space :-( and even then I had to cheat a little bit to get it that
small.
I'm *really* interested to see what tricks DEC played to implement the real
TMSCP boot PROM for the M9312. The MSCP PROM source is available and
they did
some really groady (cool) hacks (depends on your point of view) to use
words as
both instructions and data.
Don
My semi-yearly reminder....
Would anyone have the DEC boot rom for the M9312 that boots off
TMSCP TK50 &
TU81 (MU)? Please check your M9312 boards and your PDP-11/44 boot
roms for
rom "E39A9" or part number "23-E39A9".
If you have it, I (and a few others) would love if I could borrow
it to make
an image.
Is this not it? (Am I missing something?)
http://www.koders.com/noncode/fid5430B733F8815278811DA087D7331E72216E0CDB.a…