[TUHS] CR delay for VT05

[Random832]

On Sun, Jul 19, 2020, at 19:32, Richard Tobin wrote:
> Looking at the 6th edition man page tty(2), I see
> 
>      Carriage-return delay type 1 lasts about .08 seconds and is
>      suitable for the Terminet 300.  Delay type 2 lasts about .16
>      seconds and is suitable for the VT05 and the TI 700.  Delay
>      type 3 is unimplemented and is 0.
> 
>      New-line delay type 1 is dependent on the current column and
>      is tuned for Teletype model 37's.  Type 2 is useful for the
>      VT05 and is about .10 seconds.  Type 3 is unimplemented and
>      is 0.
> 
> Why would the VT05 (a VDU) need a delay for carriage return?
> I can just about imagine that it might need one for linefeed
> if it shifted the characters in memory.

According to the VT05 manual, it only required a line feed delay [and other functions, most of which other than erase screen had in common that they moved or could move the cursor's vertical position] and only needed about .02 seconds ["slightly greater than one full cycle of the AC line", and the examples given were 1 character per 600 baud]

https://vt100.net/docs/vt05-rm/chapter2.html