M9301-YB Bootstrap/Terminator ROM dumps / listings?

Jörg Hoppe j_hoppe at t-online.de
Thu Apr 30 15:05:22 CDT 2015


Maybe you know about it, but here is the commented source code of all 
M9312 bootloaders. I found it on www.ak6dn.com 5 years ago, but the page 
seems dead now.

Very likely the actual PDP-11 code is identical to M9301, but the 
organization of the bootloaders inside the ROMs is different:
M9312 has a modular structure, because ROMs can be changed 
independently. M9301 has a central directory.

Hope this helps,

Am 30.04.2015 um 17:06 schrieb Noel Chiappa:
>      > From: Jorg Hoppe
>      >> Here's what I have so far:
>      >>    http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/M9301-YA.mac
>      > Thanks for that effort!
> Eh, de nada. Interesting and educational.
>      > The M9312 code should be similar, at least it may expose some ideas
> Some parts of it (e.g. the CPU diagnostic) are mostly identical (and the
> comments there, particularly on the single-op register instructions, are
> useful to total understanding of that code in the M9301); but alas, I had
> already done that part of the M9301 (at least, at a surface level)!
> Much of the M9312 (including the functionality of most of what I had yet to
> read in the M9301) was quite different. I did manage to get the 'print
> number' code out of it, but that was pretty much it.
> So I've done a lot of the remaining M9301-YA code (new version uploaded to
> location above); not the per-device code, I'll probably blow that off, but
> other than that, only a few tiny sections remain to be understood.
> Can someone with a M9301-YA please verify for me that location 165450
> contains 0770? I think that perhaps that is wrong, because the code makes no
> sense if that's correct - maybe a bit has been dropped, or something?
> And if anyone has a good M9301-YB, I would appreciate a dump. (I do have one,
> but don't - yet - have a running UNIBUS -11 to plug it into.)
>      > From: Don North
>      > 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
> Hey, all I know is what's in the manual (which Josh posted). :-)
> I'd forgotten there was a jumper you could pull - I tend not to like to do
> things like that as it makes the cards non-pull-and-plug interchangeable. Hence
> my suggestion to 'just use an M7800'.
> 	Noel

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