Article View: sci.electronics
Article #1435Re: CRT vs Video Controller
From: Greg Bell
Date: Fri, 08 Sep 1989 02:36
Date: Fri, 08 Sep 1989 02:36
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>> The only chip I've looked at so far is Intel's 8745 CRT controller. But, this
>
> I've never heard of the 8745, (work in a Motorola shop) but a chip like
>the 8276H (page 6-32 of the 1988 Intel Perhipherals book) is probably similar.
Whoops... yep, the 8276H is what I was thinking of. The idea of having to
have an external character ROM was a bit discouraging....
>All of these chips have outputs like /HRTC and /VRTC, which you can simply logically
>AND (or OR, depending on the sense) to obtain your sync signal; and /VSP, which you
>use as blanking. The output of the dot clock shift register you then use as the
>video signal for modulation.
>
Thanks for the info. Now that I know its possible to use the 8745, I'll take
a closer look at the databook.
> Surely someone makes (by now) a cheap CRT controller with a built - in
>character ROM?
You're probably right... looking through the Jameco catalog, I spotted several
$20+ controllers that must have some nice features.
Greg Bell_________________________________________________________
Hardware hacker |
Electronics hobbyist | UUCP: uunet!serene!pnet12!gbell
EE major at UC San Diego |
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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!purdue!gatech!hubcap!ncrcae!ncr-sd!serene!pnet12!gbell From: gbell@pnet12.cts.com (Greg Bell) Newsgroups: sci.electronics Subject: Re: CRT vs Video Controller Message-ID: <920@serene.UUCP> Date: 8 Sep 89 02:36:06 GMT Sender: root@serene.UUCP Organization: People-Net [pnet12], Del Mar, CA Lines: 27