[GreenKeys] Information on Extel Printer

[Bill Allen Jr]

Ahh, so it was UPI.

 ok that makes sense as there is an rca service sticker on the side.

there are two boards in the extel case that holds the printer and one appears to be a tone demod.

another list member did note that some extels used 60 ma current loop interfaces.

i'll check for the contacts on the carriage sides.

now to find an ibm serial card from the pc xt days so i can try to get it to print.

the ibm 8 bit single db25 port serial cards are jumper convertible for current loop.


after i find the card i should be able to get the unit to print providing
i can find the connection points for the tone demod and bypass it to feed the loop.

it's gonna be awhile as the serial cards are getting hard to find and other converters are pricey.

i find your 30 year old memory quote interesting as this printer was found in the cold storage area of a local tv station and has been there for 20 to 30 years!

the poor thing was in an okidata printer box and all these years we thought an old okidata was in the box - imagine my surprise when we opened the box during spring cleaning and i saw a teleprinter!

i kindda miss the model 33asr's i once had but there is a model 18 or 19
in a radio stations storage i may ask for.

not sure about the exact model but is has a keyboard so it is SR and it had typewriter style printing keys (no type ball or cyl) and the grey or black crinkle finish case.

Bill



Sheldon wrote:


I am going to go out on a limb, as I am having to go from memory of things I knew more about, roughly 30 years ago.

If the Extel printer had an RCA logo on it, it was probably in UPI use.  UPI used RCA Service to maintain their equipment, while the AP tended to use in-house technical staff to keep their machines working.

The print head is seven pin, with a small electromagnet to drive that pin to print the portions of the completed printed item, as the print head stepped across the paper.

Any possibility the model is an AH-11R?

The AP Extels were generally loop current driven, as the AP had numerous Lenkurt 25A stand-alone single channel VF demodulators.

The UPI Extels were generally outfitted with a tone demodulator which was installed in the Extel case.