; initilization of screen
INT #$13
LDA #0
GAME
INT #$14
LDX #0
LDY #0
JSR DRAWRECT
INT #$15
JMP GAME
SED
DRAWRECT ; takes X,Y, and accumulator
MAJOR
LDY #0
MINI 
ADC #1
INT #$16
INY
CPY #$FF
BNE MINI
INX
CPX #$FF
BNE MAJOR
RTS