From: Random832 <random832@fastmail.com>
To: TUHS <tuhs@minnie.tuhs.org>
Subject: Re: [TUHS] CR delay for VT05
Date: Mon, 20 Jul 2020 00:28:09 -0400 [thread overview]
Message-ID: <798e20fd-addf-4f9a-a4f9-b3dabb8ebe3c@www.fastmail.com> (raw)
In-Reply-To: <20200719233207.BB69D2D9E6DD@macaroni.inf.ed.ac.uk>
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
next prev parent reply other threads:[~2020-07-20 4:29 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-19 23:32 Richard Tobin
2020-07-20 4:28 ` Random832 [this message]
2020-07-29 23:23 ` Dave Horsfall
2020-07-30 0:56 ` Clem Cole
2020-07-30 16:42 ` Paul Winalski
2020-08-12 2:09 ` Dave Horsfall
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