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Re: Compare Apple II's and Commodore 64's Video
- Subject: Re: Compare Apple II's and Commodore 64's Video
- From: heuser.marcus@freenet.de
- Date: 23 Jul 2005 23:45:02 -0700
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> Thank you for explaining. Let say for example. Apple II uses only $400 through $7FF to display black and white text.
> How can C64 display color text? It looks like that $400 through $7FF is for text's pixel and $800 through $BFF is for text's color.
> C64 reads $800 to select 4 bits color for foreground and background while it reads $400 to display colored pixel to the screen.
> (I can't say if C64 uses $400 through $BFF, but it is only an example.)
The character data normally is at $0400 but can be set at various
addresses (there are certain restrictions), whereas the Color-RAM is
mapped into I/O-space fixedly at $D800-$DBE7.
> Is it like that C64 uses double memory space which one is for text's charactor space and one is for text's color space?
> Is it the same as hires to use double memory space?
Yes, as I have written in my other post.
bye
Marcus