Re: A86: 5MHz

To: assembly-86@lists.ticalc.org
Subject: Re: A86: 5MHz
From: Aaron Curtis <acurti1@umbc.edu>
Date: Tue, 28 Dec 1999 14:23:34 -0500
References: <006601bf50c0$3fc3c240$993a438a@mines.edu> <386839DE.99AB5FBD@umbc.edu> <38684893.11244744@reninet.com> <386850DD.7A69544C@oregontrail.net> <001a01bf5132$591f4760$ad52dfd1@dad> <006d01bf515e$9a197ac0$8b3a438a@mines.edu>
Reply-To: assembly-86@lists.ticalc.org


Don't we already know how often the LCD refreshes?  Every second
interrupt?

Kirk Meyer wrote:
> 
> I didn't post this because it was a "problem" and I wasn't sleeping at
> night, I posted because it seems very likely that there is DMA, and
> furthermore, it still seems possible that it can be accessed from software
> with a combination of port $04 and some of the ports from $20-$3F.
> 
> Also, if the DMA writes the LCD memory to a port (as many DMAs would do to
> get it to the LCD), and if we could figure out which port that is, it would
> allow direct access to the LCD (whatever that's worth). More importantly, it
> would allow us to figure out just how often the LCD refreshes, which would
> lead to better grayscale.

References:

A86: 5MHz

From: "Kirk Meyer" <kirkmeyer@bigfoot.com>

Re: A86: 5MHz

From: Aaron Curtis <acurti1@umbc.edu>

Re: A86: 5MHz

From: Chris Phelps <chicane@reninet.com>

Re: A86: 5MHz

From: Cassady Roop <croop@oregontrail.net>

Re: A86: 5MHz

From: "David Phillips" <david@acz.org>

Re: A86: 5MHz

From: "Kirk Meyer" <kirkmeyer@bigfoot.com>

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