DecWriter / LA30P with unibus

Jack Rubin j at
Sun Nov 2 14:20:12 CST 2014

Whoopee!! Jay has us back online - thank you, sir!

Mattis - I have an M7910 card for you; private email sent.


> -----Original Message-----
> From: cctalk [mailto:cctalk-bounces at] On Behalf Of Mattis Lind
> Sent: Sunday, November 02, 2014 2:12 PM
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: DecWriter / LA30P with unibus
> For quite some time I have been pursuing an effort to repair a PDP-11/04
> system and make it running under CAPS-11. I have had it successfully boot
> from the TU60 tape drive. The plan is now to attach a contemporary console
> terminal to it. I happen to have a LA30P which looks suitable and would make
> it a nice looking system.
> I have documented the effort here:
> 11-04
> The LA30 is now working fine but the problem is that I don't have the M7910
> or M791 card that make up the LC11 Unibus option as this terminal was once
> upon a time connected to a PDP-8/E instead.
> Is there anyone that have a M7910 or M791 card who wants to sell or trade it
> for something?
> During the restoration process of the LA30 I found that it is using quite
> uncommon paper. I needs 9-7/8 inch (250 mm)  wide paper. Is there a source
> for this kind of paper somewhere else than in the USA?
> If there is no M791 or M7910 available I have to either make my own M791 or
> make a serial / parallel converter to go into the LA30P (I guess that no one has
> the M7389 and M7731 boards that make it a LA30S, or?).
> When looking for more information on the LC11, there were limited amount
> available on the net. I did find the LC11 Decwriter System Manuel (pages
> 4-2 and 4-3 was missing which is quite annoying) but not the LC11 Decwriter
> System Engineering Drawings. Anyone knows an online source for that one?
> /Mattis

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