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Article #536

Re: modey vs 13h

#536
From: sl8nl
Date: Mon, 10 Aug 1992 03:10
29 lines
1914 bytes
> I think we need to put the complete register set of the VGA and
> EGA cards in the GAMES.IBM.FAQ, as well as some short examples.
> Also see if any AMIGA programers out thier are willing to
> contribute the specifics of their hardware as well.  Mac's too.

I see a potential problem there in that I have a VGA shareware manual...
and the complete description of the register set is around 550k!!!
(And that doesn't include the 4 chapters the guy left out so the file
would be downloadable!)

I still prefer the Blitter Chip...

Then again...I just saw the Cronolog demo.  Blew my socks off.  As many of you
know, I have written an interrupt-driven Amiga module player on the IBM; it
pumps out one byte each interrupt call.  This resulted in SLOOOOWWWWW system
access.  In fact, since IRQ 08 is a priority interrupt, the system slowed 
down to 1/4 "impulse" (sometimes less, depending on the module).  Next,
I just finished writing a DMA based module player...for any sound card 
capable of digitized output through the DMA.  That opened up plenty of
system, enough now to be bearable in programming.

OK, my point is, at least as far as I can tell, the Cronolog demo played it
the byte way, not through the DMA.  I figured no way.  But it's true!  They can
play through the Covox, the Soundblaster, the internal speaker, a DAC.  The
Soundblaster is the only one that can use DMA out of the above, but it doesn't
appear that they do.  I can see pulling the graphics off at such high speeds,
but graphics and sound?

Josh
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From: sl8nl@cc.usu.edu
Newsgroups: rec.games.programmer
Subject: Re: modey vs 13h
Message-ID: <1992Aug9.211040.57991@cc.usu.edu>
Date: 9 Aug 92 21:10:40 MDT
References: <gate.V489oB1w165w@toz.buffalo.ny.us>
Organization: Utah State University
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