[TUHS] terminal - just for fun

[milov@cs.uwlax.edu (Milo Velimirović)]

I used v6 on an 11/45 -- my comments refer to my recollections from the mid-late 1970s.

On Aug 6, 2014, at 10:26 AM, Jeremy C. Reed <reed at reedmedia.net> wrote:

> On Wed, 6 Aug 2014, John Cowan wrote:
> 
>>> So the model-33 wasn't ASCII?
>> 
>> The keyboard could send all of ASCII except lower-case letters, grave,
>> braces, and vertical bar (i.e. excluding x60 to x7E).  The high-order
>> bit was always set.  Using the paper tape reader and punch, you could
>> transmit arbitrary 8-bit characters.
> 
> I guess it was common to use the Teletype Model 33 independently without 
> any video display. (I read that it could accommodate a modem too.) Did 
> it automatically print to paper everything typed to keyboard in 
> real-time?  Or maybe only when LINE FEED or RE-TURN key was pressed?

What video? I don't recall ever seeing a TTY have video displays.
Terminals could operate in either Full Duplex or Half Duplex. The former required every character to be echoed in order to be printed. In HDX mode every character typed was both sent down the wire and printed.

Yes, some TTYs had an attached acoustic coupler and/or a paper tape reader-punch.

> 
> How would RUB OUT be used when using the sh shell? (I tried looking 
> through the code and manual for some old 32V and previous versions but 
> didn't see code for it yet.)

It wasn't really used. Most often rubout was used on systems where a "text" would be prepared offline and punched on paper tape as it was being typed. Hitting rubout would punch holes in all positions on the tape effectively obliterating  whatever had been typed. Once the offline text was complete the tape could be transmitted to a host for further processing. This was the Automatic Send part of the ASR-33. I recall doing this in the early 70s at a community college I went to -- but this wasn't connected to a UNIX system.

> 
> When did the sh shell provide intra-line editing?