RE: How to design non-trivial cartridges for c-64?

From: Rainer Buchty (
Date: 2007-05-22 12:59:34

On Mon, 21 May 2007, Scott McDonnell wrote:

> IO1 and IO2 are address decoded outputs. This means that if you read or
> write to $DE00-DEFF (any of those locations...yeah, the address decoding
> on the C64 is VERY wasted) [...]

I'd like to add that his might be the really hard task, i.e. finding an 
address space which is not preoccupied by some more or less widely used 

MIDI interfaces ($de04-$de07 or $de00-$de03, depending on the 
"religion"), the REU itself, IDE interface, CMD devices, cartridges 
(FC3, AR6, ...) come to my mind.


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