[GreenKeys] WU 22-A tape transmitter

[Chris Elmquist]

Hi Jim,

Thanks much for the reply.  It all makes sense.  I should have phrased
my question differently as I did understand it was parallel but was
wondering more about what or how the tape is advanced.  Is the reader
free running and then presents an output indicating that the character
is valid or did the TTY (or whatever this unit connects to) provide a
pulse that would advance the reader to each character?

It is true that it must be fairly simple to reverse so I will look
at that.  If there is a motor or a solenoid in there, clues about
operating voltage would be useful too.

I can easly connect it to a UART or microcontroller of many sorts but
I'm still missing any 5-level punched tape :-)   So, the fruitfulness
of that effort is questionable...

Chris N0JCF


On Monday (09/21/2015 at 11:16AM -0500), Jim Haynes wrote:
> This is a reader only, has no transmitting distributor, so it won't be
> usable for TTY unless you attach it to something like a UART.  W.U.
> had several designs of these things used in different contexts.
> 
> The original use was in time-division multiplex systems using big
> faceplate distributors for transmitting and receiving.  Later they
> were used in various switching system applications where it was
> convenient to have the tape reader output in parallel-wire form.
> 
> I don't know that there is any documentation, but they are simple
> enough you can trace out the wiring yourself.  The octal plug shown
> with this one suggests it was used in some amateur capacity.

-- 
Chris Elmquist