Antitrack_at_networld.at
Date: 2007-05-22 20:19:25
Zitat von Rainer Buchty <rainer@buchty.net>:
> On Tue, 22 May 2007, Scott McDonnell wrote:
>
> > Aren't we assuming that only one cartridge at a time is being used?
>
> Can you safely assume that? Think of IDE or CMD interfaces, SuperCPU
> etc. Would you unplug that for the sake of some other peripheral?
>
> > But, yes, it should be possible to decode the $DE00-$DEFF and
> > $DF00-$DFFF addresses even further using a bit more complex circuitry.
>
> Decoding is cheap these days. Just use some GAL or CPLD. It only becomes
> complex if all you have is a bunch of 74138 and 139.
I still don't know how to "select", in my circuirty, what memory location my
cartridge ought to use. What if I want to build a cart that uses memory from
$deb6 to $deba? And how does the cart "know" when I poke something in these
memory locations to do something?
Yours
ATT
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