paulkoning at comcast.net
Fri Sep 7 08:47:20 CDT 2018
> On Sep 6, 2018, at 8:49 PM, Rick Murphy via cctalk <cctalk at classiccmp.org> wrote:
> On 9/6/2018 1:15 PM, Paul Koning via cctalk wrote:
>> On Sep 6, 2018, at 1:09 PM, allison via cctalk <cctalk at classiccmp.org> wrote:
>>> Mostly about screen memory which back then was small and not cheap.
>> True. Did the VT05 use core memory for that? I vaguely remember it did.
> The VT05 used a shift register bank for the screen memory. This caused delays when scrolling as the content of the shift register had to be basically shifted up, thus requiring fill characters after every linefeed.
Oh yes, VT05 fill, RSTS supports that (or at least in earlier versions). That's fill after LF rather than the fill after CR needed by older hard-copy terminals (including the much despised LA30s).
VT05 was 2400 baud max, if I remember right. 9600 was mind-boggling when I first saw it.
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