1. 1 COMP541 VGA Character Terminal Montek Singh Mar 1, 2007

2. 2 VGA Driver Architecture  No frame buffer  Character terminal

3. 3 Character Memory  Dual ported Memory mapped Memory mapped CPU writes; could read also CPU writes; could read also VGA driver reads VGA driver reads  How many characters?

4. 4 Bitmap Memory  What bitmap size? 5x7 at least 5x7 at least  Codes http://www.piclist.com/techref/datafile/charsets.htm http://www.piclist.com/techref/datafile/charsets.htm http://www.piclist.com/techref/datafile/charsets.htm http://www.piclist.com/techref/datafile/charset/8x8.htm http://www.piclist.com/techref/datafile/charset/8x8.htm http://www.piclist.com/techref/datafile/charset/8x8.htm  Indexed by character memory So what code to store in character memory? So what code to store in character memory?  What size should memory be?

5. 5 VGA driver  Just sends hsync, vsync  Generates color When valid When valid Maybe smaller than VGA Maybe smaller than VGA  What character code? ASCII?  How many rows and columns?

6. 6Possibilities  Code color into some bits of character?  Later Provide sprites for games? Provide sprites for games?  Your own Nintendo Ideas? Ideas?