Subj : Re: Why $0401, $0801, $1c01? Why not $0400, $0800, $1c00?
To   : pzem...@gmail.com
From : andy carmony
Date : Wed Feb 17 2021 10:55 am

On Friday, February 12, 2021 at 10:27:12 AM UTC-5, pzem...@gmail.com wrote:
> Hi all, 
> 
> I figure that someone here probably knows why CBM's basic RAM always started at $xx01 addresses, like $0801, $0401, $1001, $1c01 instead of $0800, $0400, $1000, $1c00? 
> What is sitting in that one byte, or what role is it playing? 
> I realize that I've always taken that for granted, but never asked myself why. Or I knew it at some point in the past and forgot. 
> 
> Cheers 
> /Philip
Well, everything does start at those addresses. Screen memory starts at $0400. Basic starts at $0800. Technically when entering basic programs it starts putting code into $0801 on, $0800 contains a zero and is 'unused', but $0800 is still the start of 
basic.

http://sta.c64.org/cbm64mem.html

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