PDP-11 ID page, a few images needed

[Ethan Dicks]

On Wed, Jan 23, 2019 at 8:41 PM Allison Parent via cctalk
<cctalk at classiccmp.org> wrote:
> On Jan 23, 2019, at 8:43 PM, Paul Koning via cctalk <cctalk at classiccmp.org> wrote:
> > On Jan 23, 2019, at 5:37 PM, Noel Chiappa via cctalk <cctalk at classiccmp.org> wrote:
> >
> > http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/PDP-11_Models.html
> >
> A variant of the LSI-11 is the H-11 sold by Heathkit.  Is that actually the same board?  Either way it would be worth mentioning

I have an H11 and it has a real DEC CPU board.  The backplane is
Heath, with industry-standard (not DEC's zig-zag) backplane edge
connectors, and Heath parallel and serial cards, but the CPU card is
100% DEC.

> The heath h11 and the lsi11 are
> The same right down to the handle.   The prime difference
> Is the heath backplane is smaller number of slots and user assembled along with the case and power supply.  The memory, io, and disk system
> was all heath and could be used in dec backplanes and DEC cards in heath.  The heath disk was RX01 comparable and could format media.

Right.  The H-27 disk system definitely worked with RX01 media and
could format blank media.  I have an H-27 that came with my H-11 but
the former owner (my boss at the time) never used the H-27 and I never
got it working to boot from it.  My boss did a massive case mod to
extend the width of the box several inches and made a simple 2-slot
CD-interconnect (two Heath backplane connectors and some wire) so he
could fit in an RLV11.  That's how I used it at work, and when the
company closed and he gave me the old box, I undid the mod (it was
functional but not strong and definitely not pretty) and so now I
can't use the RLV11 in there any more (yes I have an RLV12 now).  The
point here being, we didn't use the H-27 and I never got it working to
boot from it.  All I ever had for this box was real DEC RT-11 (v5.4).
I never got the original HT-11 disks, so if the H-27 needs a special
RT-11 driver, that's likely where I'm getting stuck.

> Do you want to show the PRO system boards?  And maybe the I/O boards?  Those both are quite different looking, especially the I/O boards with their odd connector and differing number scheme.  (PRO boards are marked with the ROM ID number, a 16-bit value shown in 6 octal digits.)

Yep.  Many's the time I "fixed" a PRO by unclamping and reclamping the
backplane connector on all the boards.

-ethan