Why does the colour map move on the VIC-20?

[Lawrence Woodman]

Hello,

Does anyone know why the colour map moves between $9400 and $9600 on the Vic?
Is there a reason it couldn't stay at a single location such as $9400?

I've wondered about this for a while and there is probably an obvious reason that I'm
missing but I would love to know. My interest in this was renewed recently when I was
creating a video which shows the colour map being used as a location to store data
and now it seems I really should find out.

In case you are interested here's the link to the video:

YouTube video: Run Code and Store Data in Display Memory on the VIC-20


Best wishes


Lorry

 

[CP/M User]

I can't be certain, but I think this has something to do with additional Memory is added to the VIC the memory map shifts. I vagerly reading about it somewhere, Anders Carlsson (carlsson) probably told me this, though he doesn't come by here anymore, but maybe a PM might change all that, otherwise his active on AtariAge Forum.