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From: tainter@ihlpg.UUCP (Tainter)
Newsgroups: net.periphs,net.micro,net.wanted
Subject: Re: update on **real** 19200 CRT
Message-ID: <2324@ihlpg.UUCP>
Date: Fri, 8-Aug-86 12:19:04 EDT
Article-I.D.: ihlpg.2324
Posted: Fri Aug  8 12:19:04 1986
Date-Received: Sat, 9-Aug-86 11:25:41 EDT
References: <671@mordred.purdue.UUCP> <71@winfree.UUCP>
Organization: AT&T Bell Laboratories
Lines: 19
Xref: watmath net.periphs:1175 net.micro:15309 net.wanted:9379

> Of course, the real way to make the application work would be to have a
> video display chip that used *indirect* accesses to it's memory - instead
> of always getting line 0 from addresses 0-79, it could get them from
> p[0]+0 to p[0]+79.  This would let you scroll by blitting an array of
> 24 or so pointers, instead of the whole screen.  Probably the pointers
> should go in a dual-ported RAM, since you'll be addressing them a lot?
> Video-retrace management might become a lot simpler - switching between
> blocks of memory during a retrace could be easy.
> Bill Stewart, AT&T Bell Labs 2G-202, Holmdel NJ 1-201-949-0705 ihnp4!ho95c!wcs
Terak 8510 micros use just such a scheme.  Have you ever seen a 19.2 soft
scrolling screen?  Fun stuff for bursty material.
--j.a.tainter
For those what don't know:

Soft scrolling is when the display moves 1 pixal row at a time to scroll
your display.

The Terak 8510 is an LSI-11 graphics micro (10 years old--much better than
an IBM PC, but too expensive to manufacture).