[GreenKeys] pdp 4 w/tty console ascii ? bcd? baudot? what say you Q

[Christian Gauger-Cosgrove]

On 20 July 2014 23:32,  <COURYHOUSE at aol.com> wrote:
> ok I also found the MAINT   manual....
>
Yeah, the BitSavers archive has a wealth of information on various
bits of computer technology. Then again it is an off-shoot of the
Computer History Museum, if I recall (well at least the site is run by
Al Kossow one of the people at the CHM).

The DEC and IBM directory trees are the largest two in the archive, if I recall.


> well and  out of  54  made...  there is still a chance  one is in a
> barn.....( DREAM DREAM DREAM!)
>
Well, that is pretty much how one of the only two IBM 1401 machines
was found. In a garage in Germany. The other was in a basement in the
US. One of the two has been restored to fully functional and runnable
status, at the CHM.


> thanks  for the  link  for  brochure   I will display it  with our  table
> top  28KSR
>
> ok  from the manual...
> Keyboard/Printer and Control type 650 The Type 65 is a Teletype Model 28
> Keyboard and
> Printer, with an input and printing speed of ten characters per second.
>
> Paper Tape Punch and Control Type 75. The Type 75 is a Teletype BRPE Punch,
> with an operating
>
> speed of 63.3 lines or characters per second. It punches eight-hole tape.
> However, the
> punch may be modified to punch five-hole tape or seven-hole tape, if desired
> by the user 0
>
If I recall correctly the later 18-bit series PDP machines also used
Teletype *RPE punches in their high speed tape punches. (I want to say
the 7 used a BRPE, and the 9 used a DRPE, but I'm not sure.)


On 20 July 2014 23:45,  <COURYHOUSE at aol.com> wrote:
> this  looks  good..,
> yea  our   table top looks  as  new  as the one  in the brochure. Thanks!
>
> Hey check that  CRT terminal  in the brochure... space age!
>
You have some DEC PDP series machine with a tabletop? Might I presume
it's a "Straight-8" PDP-8? I assume the 8 because the other machines
with tables are rather rare.

Also, the rockin' DEC CRT is pretty iconic in DEC circles as it became
the DECUS logo.



If one is interested in trying out DECsys on a PDP-7 simulator (it
works on the '4 sim, but not usably so due to reasons of character
input), the singular DECtape image for it may be found here:
<http://simh.trailing-edge.com/kits/decsys.zip> SIMH itself in its
newest and freshest version may be found at the GitHub where the
project has migrated to:
<https://github.com/simh/Win32-Development-Binaries>

In its newest incarnations SIMH can connect to an external serial
port. As an exercise for the reader: Find a way to connect an actual
Model 28 KSR to the console of the PDP-7 simulator.


A less difficult exercise would be connecting an ASCII speaking
Teletype to the simulator, or to a PDP-8, PDP-9, PDP-10, PDP-11, or
PDP-15 simulator. (The only difficulty in this case being "Do I go for
an RPi hidden in the base of the machine, or a freebie desktop sitting
nearby?")


Cheers,
Christian

-- 
Christian M. Gauger-Cosgrove
STCKON08DS0
Contact information available upon request.