Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!cwjcc!gatech!mcnc!unccvax!dya
From: dya@unccvax.UUCP (York David Anthony @ WKTD, Wilmington, NC)
Newsgroups: sci.electronics
Subject: Re: CRT vs Video Controller
Message-ID: <1642@unccvax.UUCP>
Date: 6 Sep 89 12:57:39 GMT
References: <914@serene.UUCP>
Organization: Univ. of NC at Charlotte, Charlotte, NC
Lines: 23

In article <914@serene.UUCP>, gbell@pnet12.cts.com (Greg Bell) writes:

> I'm looking to use my TV as a display for my 8031 microcontroller circuit.  I

> The only chip I've looked at so far is Intel's 8745 CRT controller.  But, this
> , as it says, is a CRT controller and doesn't seem to output video readily...
> or am I missing something?

	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.
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.

	Surely someone makes (by now) a cheap CRT controller with a built - in
character ROM?

	Forget the 6845; who needs to try and get Motorola stuff to play on the
Intel bus?

York David Anthony
DataSpan, Inc