ncoplin_at_orbeng.com
Date: 2004-06-29 05:32:05
Hello Ruud,
>> 1) Will the VIC definitely ignore these writes (I presume it will
>> not address wrap and write to some existing VIC register)
> If I understand you correctly, you write to these new registers AND the
VIC?
>Why, if I may ask? Why not ONLY the new registers, then you can be sure
that
>the VIC doesn't do any funny stuff.
No, no, I only want to write to the new registers, but to save on decoding I
want the /VIC signal to still go straight to the VIC chip rather than make a
new VIC signal.
>> 3) Is there any other expansion which might already use these
>> two registers
>In that case use $D07E en $D07F. IMHO using a CPLD means you can >pick
almost any address you like.
$D07E and D07F are in the SuperCPU (I think) and so no good. Hence I want
something that is free in both standard and upgraded C64s. I'll have to
build the mod and get someone to test it as Maurice has not answered me
either....
- Nick
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