Re: VIC-20 I/O address map

From: Marko Mäkelä (
Date: 2003-01-24 11:09:37

On Fri, Jan 24, 2003 at 08:25:46AM +0100, Anders Carlsson wrote:
> While we're into the VIC-20 memory map, what are I/O blocks 2 and 3 for?

They are for external hardware, just like I/O1 and I/O2 on the Commodore 64.
I/O2 is mapped at $9800-$9bff and I/O3 is at $9c00-$9fff.  The tape
fastloader "Vic Rabbit" maps its ROM to this area, and you could map RAM
there as well (I rewired some RAM[123] lines of my memory expansion
there via diodes, in order to run the fastloader on the real machine).


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