Path: utzoo!utgpu!water!watmath!clyde!rutgers!ames!elroy!mahendo!jplgodo!wlbr!etn-rad!jru
From: jru@etn-rad.UUCP (John Unekis)
Newsgroups: comp.sys.ibm.pc
Subject: Re: SuperEGA 800x600 boards
Message-ID: <328@etn-rad.UUCP>
Date: 20 Jan 88 02:19:25 GMT
References: <3948@ames.arpa> <3790@cbterra.ATT.COM>
Reply-To: jru@etn-rad.UUCP (John Unekis)
Organization: Eaton Inc. IMSD, Westlake Village, CA
Lines: 22

In article <3790@cbterra.ATT.COM> esd@cbterra.UUCP (Eric S. Deese) writes:
>In article <3948@ames.arpa> woo@pioneer.UUCP (Alex Woo) writes:
>>
>>While shopping for an 80386 clone I noticed some Genoa SuperEGA
>>video board clones.  These board can display 800x600 (580) pixels
>>on a multisync monitor. ...
>I too, recently purchased this board, and would appreciate
>any further info.
...
Very high reolution EGA cards are becoming quite common. There is even a
rumor of a 1024x768 resolution EGA clone card coming out soon. These boards
take over the EGA-servicible interrupts from BIOS (like INT 10h) and perform
the tasks of character drawing etc. using on board rom routines. The trick
to turning on the very high resolution modes is to send a special video
mode value to BIOS. Normal ibm displays use modes 0 thru 15 for the various
mono or color character or graphics formats. The high reolution boards use 
values like 115 for the Everex 640x480 mode, or (i think) 121 for the Genoa
800x600 mode. 
  One very interesting package that makes use of these high resolution modes
  is the CLARITY1 from MASER Research. It allows you to capture video images
  and display them in real color or mono (not dithered), at the high resolution
  of these boards. Info on the CLARITY1 can be had from SEFCO at(818)765-8882.