[GreenKeys] Introduction

[Richard YOUL Brisbane]

Thanks to everyone who wrote to me on joining recently. Please note that
(because of greenkeys) I now have E-Mail at home. My patient neighbour
Grizzly should now be deleted from your files.

Rather than bore everybody with my ramblings, I'll give a brief account of
my machines, modifications and gadgets. If anybody wants more details or a
chat, then feel free to contact me.

All printers are page machines, and models used by the Australian Post
Office unless indicated.

Creed 7B 		                  	(3)
Creed 8B (receive only 	                  (1)
Teletype 15                               (1)
Teletype 19 (tape perf)                   (1)
Siemens M100 Mk I (much like T100)        (3)  One with double current
(polar) relay box
Sagem  T10 (Electronic) RX only           (1)
Sagem  TX20   "                           (2)   Double Current
Sagem TX 35 (2000) "                      (2)       "     "
Sagem TX35E (2001) "                      (1)       "     "

Teletype 28 Keyboard, on trolley          (1) Ex military, governed motor
Kleinschmidt   TT-4A TG                   (1) Ex Australian Army

Tape Transmitters/Readers

Creed 6s/4                               (1)
Teletype 15 (?19)                        (1)
Teletype 28                              (1)
Siemens twin head                        (1)

Reperforators

Teletype 14 Printing reperf no keybd     (1)
Teletype 14 FRXD reperf transmitter      (1) On loan from Telstra Museum
Sydney
Siemens 15a        "       "             (1) Actually a 15f wired as a 15a

Perforator

Teletype keyboard tape perforator.       (1)

Modifications. The TT 15 and TT19 only had remnants of the Figs Blank H
motor stop apparatus. I added a relay and some contacts, and now machines
respond to command and motor stops. It restarts on a line bump.(receipt of
any character).

Original parts were not available for adding the two-colour feature to M 100
machines, so I devised a system which is comparatively simple to install,
made up of bits and pieces already on hand, and this has proved to be rather
reliable, and helpful with long phone 'chats' as this 'monitor' printer
records the whole conversation in two colours, no matter what teleprinter in
the collection I am typing from.

A number of teleprinters have had character recognition added. Figs Z
[+](end of message signal) operates a contact, creating a current flow. One
particularly simple but reliable method has been devised. Both the Teletype
14 FRXD and Siemens 15a have been connected to  relay boards so that their
motor starts automatically on receipt of a line bump, and transmission of
tape commences upon receiving Figs Z. Motor stops automatically about 10
seconds after transmission ends, or if there is a pause of about 10 seconds
when typing a message into these machines.

Most teleprinters are wired into a small switchboard and can be connected
back to back in pairs as desired, or can be connected to a modem for use
over phone lines. Each machine can be used solo when not plugged back to
back with another. A Creed and a Siemens are in a local loop to a
neighbour's home.

I have also built a character simulator which returns GA (go ahead) to line
upon receipt of any character at the start of a transmission, and returns
ROK (received OK) upon receipt of Figs Z Ltrs. This can be operated with the
14 or 15a R/T, via the modem or with a back to back pair.

Circuits are available for interfaces to connect single or double current
teleprinters to either TTL or RS232 modems or computers.

Additionally I set up working demonstrations of the Murray Multiplex at the
Telstra Museums in Brisbane and Sydney.

If anyone wants details of any of this, feel free to contact me. While I
don't claim to be able to explain every teleprinter fault, there is a fair
chance either I or Telstra Museum Brisbane members can offer advice.

Regards,
Richard Youl