*= $1000
 ; initilization of screen
INT #$13
LDA #0
GAME
INT #$14
LDX #0
LDY #0
ADC #1
JSR DRAWRECT
INT #$15
JMP GAME

DRAWRECT ; takes X,Y, and accumulator
MAJOR
LDY #0
MINI 
INT #$16
INY
CPY #$FF
BNE MINI
INX
CPX #$FF
BNE MAJOR
RTS