<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
<title></title>
</head>
<body bgcolor="#ffffff" text="#000000">
BTW: I was the author of the test program for the SBC-188 / uPD7220
combination. The board was first brought up at 640x480, 16-colors.
Going to a 40Mhz (from 25Mhz) oscillator allowed 800x600 SVGA
graphics. This is the limit of most of the 7220 chips.<br>
<br>
The 7220 talks to the outside world over an 8-bit interface. The
CPU sends it commands to perform its various operations: line
drawing, memory read/write, "character draw", ... Unfortunately,
'bitblt' operations looked to be pretty cumbersome, and interest in
the board waned.<br>
<br>
AFAIK, there was never any software done with the Z80, beyond
establishing communication with the board to prove it worked on that
platform.<br>
<br>
--John<br>
<br>
<br>
<br>
<br>
On 06/06/2014 09:30 PM, Frank Vanderydt wrote:
<blockquote
cite="mid:ee86ab6a-4160-4a76-aedb-825a5ba88181-/***@public.gmane.org"
type="cite">
<div dir="ltr">Well, but 7220µpd has only a test program for
80188, so i don't think anybody has tried using it for Z80/Z180,
would be cool to have a SVGA resolution on a Z80 and i bought 6
of them from ebay.<br>
The concept VGA really got my attention and looks like an
interesting project to me.<br>
<br>
Is there a true VGA/SVGA project that really uses a buffered
display and not a terminal setup ?<br>
I would like to understand VGA/SVGA on a hardware level, how
does CP/M interacts with the VGA chip ?<br>
<br>
Op zaterdag 7 juni 2014 02:35:11 UTC+2 schreef Andrew Bingham:
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
0.8ex; border-left: 1px solid rgb(204, 204, 204);
padding-left: 1ex;">
<div dir="ltr">The UPD7220 has some primitive-drawing routines
that can be pretty powerful.<br>
<br>
On Friday, June 6, 2014 9:32:12 AM UTC-7, Frank Vanderydt
wrote:
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
0.8ex; border-left: 1px solid rgb(204, 204, 204);
padding-left: 1ex;">
<div dir="ltr">Hi there,<br>
<br>
Since most of the Z80180 board only support ascii mode
and tty console why not use semi-graphics like ZX81 to
add some gui-like possibilities ?<br>
It's just a thought of a future Propio update ;)<br>
<br>
Bye,<br>
<br>
Frank<br>
</div>
</blockquote>
</div>
</blockquote>
</div>
-- <br>
You received this message because you are subscribed to the Google
Groups "N8VEM" group.<br>
To unsubscribe from this group and stop receiving emails from it,
send an email to <a moz-do-not-send="true"
href="mailto:n8vem+unsubscribe-/***@public.gmane.org">n8vem+unsubscribe-/***@public.gmane.org</a>.<br>
To post to this group, send email to <a moz-do-not-send="true"
href="mailto:n8vem-/***@public.gmane.org">n8vem-/***@public.gmane.org</a>.<br>
Visit this group at <a moz-do-not-send="true"
href="http://groups.google.com/group/n8vem">http://groups.google.com/group/n8vem</a>.<br>
For more options, visit <a moz-do-not-send="true"
href="https://groups.google.com/d/optout">https://groups.google.com/d/optout</a>.<br>
</blockquote>
</body>
</html>
<p></p>
-- <br />
You received this message because you are subscribed to the Google Groups "N8VEM" group.<br />
To unsubscribe from this group and stop receiving emails from it, send an email to <a href="mailto:n8vem+unsubscribe-/***@public.gmane.org">n8vem+unsubscribe-/***@public.gmane.org</a>.<br />
To post to this group, send email to <a href="mailto:n8vem-/***@public.gmane.org">n8vem-/***@public.gmane.org</a>.<br />
Visit this group at <a href="http://groups.google.com/group/n8vem">http://groups.google.com/group/n8vem</a>.<br />
For more options, visit <a href="https://groups.google.com/d/optout">https://groups.google.com/d/optout</a>.<br />