[GreenKeys] Teletype 32-ASR

[Trammell Hudson]

On Jun 11 2013 1:32 PM, tony.podrasky wrote:
> [...]
> I don't think the machine is worth much: guys want an
> 8-level (ASCII) machine that they can connect to an
> old computer - like an IMSAI (sp?) - and have a retrograde
> setup.
>
> To make matters worse, if it runs at 66 Words Per Minute,
> it's even more oddball because normal Teletype service is
> usually 60 WPM.

The interface board and firmware that I've designed for the ASR33 and 
Model 15 could be used for this sort of odd interface to connect it to 
modern hardware.  All of the current loop driving, weird baud rate 
generation and ASCII to code mapping is handled in the AVR firmware so 
that it shows up as a normal USB serial port to the computer.  So if 
you're planning on connecting it to a Pi or SimH virtual machine instead 
of an RTTY receiver or something like a real Altair, this might be a way 
to make use of an oddball device like this one.

I recently posted a short write up on the Model 15 part of the 
interface: http://www.nycresistor.com/2013/06/06/usb-teletype/

-- 
Trammell