[GreenKeys] Siemens T100 Teletype and Terminal Unit 1960's Australia

[simon]

Hi Colin,

I've been working on some T100 machines lately, but all are of a 
"special" version: one is a former computer terminal, working on 
74,23Baud and using a different coil and characterset. the other one is 
a T106 with a 6bit setup and 4 chars per hammer!. not only the platten 
goes up and down, but also the basket.

I'm not shure what you mean by "terminal unit" If you mean the keyboard 
and encoder, i.e. the sending part, that is actually just a nc 
switchwith a mechanical way of going from parallel tot serial info. 
there are no active components or voltages involved. In my 
computerversion, the papertape reader has a separate serial encoder 
switch and can be remotely controlled. on the regular teletype, sending 
is controlled by a pushbutton.

some t100's have a timeout relay to shut of the motor after a certain 
amount of time. on the t106 i made a mechanical system with metal wire 
to retrigger that relay when a key on the keyboard is pressed, triggered 
by a lever right next to the who-are-you drum assembly.

to get the machine working in local you have to set the printer coil and 
keyboard sendswitch in series and apply a powersource. I have no idea 
how much power to apply, as mine works on 5v 20mA, but you could start 
by using a 9volt battery and increasing the voltage until the chattering 
stops.putting wallwarts in series works as well.

identifying the proper leads to use is a different procedure. I have nio 
idea what kind of cable comes out of the machine, but it could be one 
with 2 to 8 wires. using a multimeter set to buzzer mode can identify 
the several wirepairs, as they will be paired: one pair for the receive 
coil, one pair for the keyboard with a short in neutral and another one 
for the papertape sender. maybe another pair for changing the printing 
colour, but that depends on the machine you have.

the papertape puncher is a completely mechanical affair.

simon

On 03-09-15 01:25, Colin Greenwood wrote:
> Hello All
> I have been restoring an old Siemens T100 with tape reperf and reader. I
> "appear" to have the teletype machine side sorted,
> however I am running it through the old Australian PMG Terminal Unit. I
> have been advised by a very good knowledgeable source to wire up the tty
> without
> the terminal unit, however I was hoping someone may be familiar with the
> terminal unit, and there may be
> an easy way to get it to work in local. At this stage I want to be able
> to type and have the print come up on paper, and
> likewise use the tape reperf and reader. This will at least prove that
> the tty is working. Any advice greatly accepted. Wanted to add
> no disrespect intended to the person who has been assisting me with this
> project. I am just hoping there may be someone who
> has information on the terminal unit. Efforts thus far to loop the
> transmit and receive has not been successful, and have
> recently read that the terminal unit can do this itself somehow. I am
> thinking that the attempts made so far may be getting
> messed with by the terminal unit, thus the advice to remove it all
> together. As it is currently getting its power from the
> terminal unit, I am trying to avoid a rewire if there is a simple fix to
> this.
> There was a three way switch on the transmit and receive cord from the
> terminal unit, however the switch was not operating.
> Any advice on the terminal unit would be greatly appreciated.
> Regards
> Colin Greenwood
> VK2VAR
>
>
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-- 
Met vriendelijke Groet,

Simon Claessen
drukknop.nl