Commodore VIC-20 - USING YOUR CHARACTERS ON THE VIC

Chapter 6: Graphics 199
When you are satisfied with the dot pattern, calculate the values of the
rows in screen memory. For each row, add the numbers at the top of those
columns whose dots are "on." Here are the values for our stick man.
Binary Decimal
2 6 3
00111000 56
00111000 56
00010000 16
01111100 124
00010000 16
00010000 16
00101000 40
00101000 40
Your new character is now ready for a screen test.
USING YOUR CHARACTERS ON THE VIC
To use your custom characters on the VIC, there are three steps you
must take.
1. Your program must set aside an area in memory to hold your
character memory.
2. Your character patterns must be loaded into character memory.
3. Your program musl tell the VIC chip to start using your character
memory instead of Commodore's.
In order to simplify your initial experiments, you can start by making a
copy
of Commodore's characters, replacing them one by one with your own.
To get started, enter and run the following program:
1 POKE 52,24:POKE 56,24:CLR
2 PRIHT 1:,]IIDABCDEFGHIJKLMHOPQRSTUVWXYZ[£l1'+-'"i
3 PRINT CHR$(34);CHR$(34)iCHR$(20); 1*$~&/O!ll+,_.";
4 PRINT 1/0123456799:i(=>?"
5 POKE 36869,254
6 FOR 1-6144 TO 7679 : POKE 1,PEEK(26624+I) : HEXT