10 Aug
2012
10 Aug
'12
4:56 p.m.
-----Original Message-----
From: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org]
On Behalf Of MikeS
Sent: Friday, August 10, 2012 5:50 PM
To: cctalk at classiccmp.org
Subject: RE: X Window server for NEC 7220
Original Message:
Date: Fri, 10 Aug 2012 13:53:41 -0400
From: "Andrew Lynch" <LYNCHAJ at yahoo.com>
....
The NEC uPD7220 readily adapts itself to the S-100 bus and provides a nice
VGA monitor compatible bitmap. However it is completely non-VGA
compatible and really is as different from the MC6845 derivative as can
possibly exist.
It uses a totally different approach down to the philosophical theory of
design!
If you or anyone else has some insight on how to implement a register
compatible SVGA on the S-100 bus I am very willing to listen! Thanks and
have a nice day!
Andrew Lynch
-------Reply:-------
Isn't it always the way... a couple of weeks ago I finally threw out about
4"
worth of detailed OEM documentation about designing
for and implementing
PCChips VGA chips, among others...
The NCR Decision Mate (for one) used the 7220 and I even still have some
of
the guts of one including the video board if it's
any use to anyone. IIRC
there
were some drivers etc. to make them semi-compatible
with the PC; maybe
you can find something useful among the NCR crowd?
Hi Mike! If you find any commented VGA BIOS source listing in your stash
please don't throw them away. We may have to modify our approach to finding
a commented VGA BIOS source listing and building the S-100 VGA board around
that chipset rather than some other rational approach.
Thanks and have a nice day!
Andrew Lynch