From: Marko Mäkelä (marko.makela_at_hut.fi)
Date: 2003-07-10 09:04:45
On Thu, Jul 10, 2003 at 01:15:50PM +0800, ncoplin@orbeng.com wrote:
> I need some reminding about this. Writes $00/$01 go off-chip, whilst reads
> are to on-chip registers only?
The R/-W and address lines are driven during writes to $00 or $01, but
the data lines are not. When either location is written to, the RAM address
0 or 1 will be written with whatever value happens to be on the bus (in many
cases, the last byte fetched by the video chip).
Marko
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