[no subject]

If you load the memory at $400 with $41 then the video circuit displays
the 'A' character if it is in text mode.  If it is in low resolution
graphics mode, then the video circuit builds a red block over a green
block.  If it is in High Resolution, the video circuit reads other
memory locations and displays dots based on the bit pattern.


Bryan Parkoff wrote:
>     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.