Re: 40x24 Resolution Question

["Bryan Parkoff" <BParkoff@satx.rr.com>]

> The actual bitmaps of the characters are stored in a ROM in the video
> circuitry.  This ROM is not accessible to the 6502 and you cannot
> read it from BASIC or assembly language.  You can replace it
> with a custom-programmed EPROM.  One of my Apple IIe's has a double-
> sized EPROM so I can switch between unenhanced and Mousetext.

    Yes, it is what I meant bitmaps of the characters are stored in video
ROM that they are not stored in any memory address $0000-$FFFF.
    I am wondering how it works.  If you want to load 'A' character before
store it in $400, it will appear in the first column and first row.  How can
video ROM read $400 before prints bitmaps into screen?  I am curious.

Bryan Parkoff
BParkoff@satx.rr.com