On Sun, Dec 30, 2012 at 02:31:11PM -0500, B. Degnan wrote:
> By the way, thanks for the great web site, I really appreciate the
> time and effort put into putting all this together.
> I am getting closer to having a
> "DEC teletype" set up, by following these directions
I was recently looking at that and either missed it or didn't see the
schematic for the 4915 board.
I did find a version here
The free version of Eagle will dispaly them. I put a PDF copy here in
case you don't wish to download Eagle.
I was reparing some of my spare cards and noticed that the reader run
drive signal was going way negative at turnoff. When I originally did it
many years ago I didn't put a diode across the relay coil. Adding that
made it stop abusing the drive transistor.
> Right now my teletype is stock, and only capable of receiving, but at least
> that part works great now.
Thats good. Hopefully you will have it fully functional. It should
transmit without the mod, just the paper tape reader may loose characters
and won't turn on automatically.
Those bus bars they used on cards for power distribution are annoying
me. One card had an intermittent where one of the pins has bad solder
joint. Another card several of the pins were broken off entirly that
was a pain to fix.