ASR 33 mods for Digial pdp 8 or 11
> On Sun, Dec 30, 2012 at 04:15:19PM -0500, David Gesswein wrote:
> > It should
> > transmit without the mod, just the paper tape reader may loose
> > and won't turn on automatically.Teletypes
> This may have been unclear. It is referring to the reader run mod.
> had lots of options so it can be configured such that it doesn't work.The
> teletype does need to be set to passive transmit loop (just contactclosure).
>I understand what you're saying about the reader control. I may be able to
load the absolute loader without the run reader add-on, but not do more
complex reads. Also, I will have to manually start the reader and manually
stop it, which may cause problems if the computer has precise tape advance
operations or stops and starts.
My stock teletype can receive, but I believe you have to complete some of
the mods listed on page two and three of your doc ...
... to send from the ASR to the computer, regardless if you have the run
reader card installed.
I was told you needed a manual reader for the run reader (part number 4915)
to work. If the read arm springs back from START it's "automatic" and
will not work with the pdp 8 or 11 as DEC intended.
What I think I will do is make the mods to the UCC-6 terminal strip, molex
plug connector 4, and WRU Prawl Spring (what ever that is) and see what
happens. These mods are on page 2 and 3 of the doc. I can always put it
back. I still plan to do more research. If you or anyone happens to have
a photo of their DEC-supplied teletype's UCC-6 molex plug connectors and/or
terminal strip I would be interested to see for comparison purposes. I am
confident I have the correct terminal strip connections coming from the PDP
11/05. I double checked this today.
- On Sun, Dec 30, 2012 at 09:53:38PM -0500, B. Degnan wrote:
>Since the instructions are just more a to b without diging out more
> My stock teletype can receive, but I believe you have to complete some of
> the mods listed on page two and three of your doc ...
> ... to send from the ASR to the computer, regardless if you have the run
> reader card installed.
documentation I can't tell what the changes really do. If you decide you
need help I will do that.
> I was told you needed a manual reader for the run reader (part number 4915)It may not work as DEC intended but it will work. Mine does the spring
> to work. If the read arm springs back from START it's "automatic" and
> will not work with the pdp 8 or 11 as DEC intended.
back and I got it to work ok. I didn't get the original teletype. I got one
from a HAM and figured how to modify it back before I had access to the proper
modification documentation so it may be unique.