[Simh] PDP-15/76

[Davis Johnson]

I also have an original distribution dectape for pdp15 dos, actually 
from DEC. Looks like it has never been unspooled. Got it from a site 
that didn't turn off their last '15 until almost 1990. Their application 
ran on the bare metal so they didn't actually run DOS.

The way they did software maintenance was interesting.

On 03/16/2016 04:06 AM, Pontus Pihlgren wrote:
> On Tue, Mar 15, 2016 at 06:31:35PM +0100, Mattis Lind wrote:
>> The documentation was the only thing that remained from the PDP-15
>> installation at Standard Radio & Telefon (part of the ITT company) that was
>> used for development of the ATC (Automatic Train Control) system.
> An I have DECtapes from this system. I recall at least one being labled
> DOS. Could the content of these tapes be of help?
>
> In that case I should make another effort to dump these tapes (I have
> dumped a few).
>
> /P
>
>> /Mattis
>>
>> 2016-03-15 17:46 GMT+01:00 Bob Supnik <bob at supnik.org>:
>>
>>> I've pulled together the hardware pieces for the PDP-15/76 (PDP-15 with
>>> UC15 PDP-11 IO processor), so now it's time to consider what software can
>>> be run.
>>>
>>> The most likely candidate is XVM/DOS-15. While vanilla DOS-15 had UC15
>>> support at some point, neither a complete source kit nor the appropriate
>>> restore DECtape images seem to be available. The XVM/DOS-15 kit has all
>>> required DECtapes, but it lacks the paper-tape elements. Fortunately, these
>>> exist in source form in the XVM/DOS-15 source kit.
>>>
>>> ABSL11 - a PDP-15 read-in mode tape that allows PDP-11 absolute binary
>>> tapes to be read into shared memory and moved to private memory. (This is
>>> not strictly necessary, because the PDP-11 side has its "hardware" binary
>>> loader via the LOAD command.) This is used to load PIREX. It must be
>>> assembled on the PDP-15.
>>>
>>> PIREX - a PDP-11 absolute mode tape that runs the PDP-11 IO executive. It
>>> has to be assembled on an -11, so the source must be loaded into an RT11
>>> system, assembled, and punched out as a binary paper tape image. It's
>>> possible that the macro11 cross assembler could be used instead.
>>>
>>> DOSSAV - a PDP-15 binary tape that restores a distribution kit (usually
>>> two DECtapes) to RF, RP, or RK disk. It must be assembled on the PDP-15. It
>>> uses PIREX.
>>>
>>> RKBOOT - a PDP-15 read-in mode tape that uses PIREX to boot a PDP-15
>>> operating system off the RK15 (an 18b RK11). It must be assembled on the
>>> PDP-15. It uses PIREX.
>>>
>>> /Bob
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