31612RE: [midatlanticretro] M9312 Diagnostic PROM for PDP-11/24 (23-774F1)
- Jul 14 8:34 AMThere was a diagnostic ROM on that 9312 boot module in my machine numbered
23-774F1 of which I asked the C'Cmp list about. Back then I could not find
anything at all on that part, i.e., what diags it did, other functions,etc.
The fellow who'd contacted me has an 11/24 with that PROM and is looking for
the same info I once had been.
So, I'm asking here if there is anyone who may have knowledge of this device
in any way (actual part, source listing, etc.)?
Short answer - It's probably a newer ROM that is not in many M9312 docs, you
need to find the addendum to the orig doc, or a relatively rare article/doc
that talks about using an older ROM card in a newer 11/24 system. This
would not have been a typical coupling in the early-mid 80's
As you probably already know the last two chars of a M9312 ROM indicates its
function. F1 = console emulator and diagnostic routine. The last two chars
for a boot ROM is A9.
Based on this and older ROM docs I think you have just the main 11/24
console emulator and diagnostic ROM, a later version with ascii console
emulator routines and diagnostics for the 11/24.
If you check Appendix E section E.2 of EK-M9312-TM-003 (manual # for the
M9314), appendix E has a cross reference table that you can use to determine
from the part number and some memory testing which device this ROM was made
for. Problem is that your ROM is for a device that is newer than the
original M9314 doc was created, like a hard drive or DEC Professional Series
diskette drive. It's not going to be easy without the update/addendum
published for EK-M9312-TM-003, you'll only be able to determine which ROM
it's *NOT* otherwise.
You may need to put this card with ROM in a working older system like a
11/40 that has a front panel to determine the ROM contents. I am pretty
serious about bringing my 11/40 to the August workshop this time, if with
help I can get it running we can use it to check the ROM, I will bring a
M9312 just in case.
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