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From: zhahai@gaia.UUCP
Newsgroups: comp.sys.ibm.pc
Subject: Re: 10 Mhz Problems
Message-ID: <298@gaia.UUCP>
Date: Fri, 13-Mar-87 19:17:07 EST
Article-I.D.: gaia.298
Posted: Fri Mar 13 19:17:07 1987
Date-Received: Sat, 14-Mar-87 15:16:39 EST
References: <2434@dalcs.UUCP> <380@uhccux.UUCP>
Reply-To: zhahai@gaia.UUCP (Zhahai Stewart)
Organization: Gaia Corp., Boulder, CO
Lines: 32

In article <380@uhccux.UUCP> todd@uhccux.UUCP (The Perplexed Wiz) writes:
>In article <2434@dalcs.UUCP> dalegass@dalcs.UUCP (Dale Gass) writes:
>>     I would really like the 10Mhz *and* a CGA card. Does this companies
>>  explaination for my problems should correct? If my CGA card is the
>>  problem, does anyone know of a CGA card that can run at 10Mhz?
>
>Hmm...I don't know about CGA cards but if you would consider an EGA
>card, the SigmaEGA works fine in a 10MHz 80286 machine I use.
>It turns out that the RAM in some other EGA boards is simply too slow
>to keep up with the 80286 running at 10MHz.  If you find that your
>EGA display collapses when you turn the entire graphics screen on,
>then your EGA card probably has the slow RAM problem..

Even the IBM EGA seems to work with fast memory cycles (such as 8 MHz with
0 wait states, with is more difficult than 10 & 1 for memory).  This seems
to be because the memory is reasonably fast to support the video access,
and the bus interface is already set up to insert as many wait states as
needed (which it needs even for a straight PC, much less a fast AT).

Thus an EGA card should solve your problem.  If you really need CGA
compatibility, the built in emulation MAY also be fast enough.

I suspect that many of the EGA clones would also work (like the Sigma
mentioned by Dale), but see if you can get a chance to test them before
final acceptance.

(Of course, they may be misleading you, your problem could be that their
motherboard is flakey and no video board will solve things...).  ~z~

-- 
Zhahai Stewart
{hao | nbires}!gaia!zhahai