Hi everyone. I have a little problem. I have some versions of the same code I would like you to have a look at. The task is to display the amount of X's across the screen and the same amount of lines, that corresponding to the the key you press. eg
if the key press is 2 then it will display
XX
XX
I have got an idea of how to do it. But when I try and store the key presss in the variable at the start of the code after I get the keypress it stops my programming working probably. I have declared a variable called keyPress .byte 0
Here is one version of the code.
Code:
; Initialise constants
lowerBound .equ '1
upperBound .equ '9
count .equ '0
spaces .equ 54
;
; Get keypressed from keyboard
ldx #$FFFF ;keyboard
wai
;
;Load the key pressed into AccA
ldaa 0,x
; staa keyPressed
clrb
tab
;
cmpa #lowerBound
blt finish ; branch to finish if key press is less than lowerBound
;
cmpa #upperBound
bgt finish
;
ldx #$FB00
ldaa #'X
loop1 staa 0,x
inx
inc count1
decb
cmpb #count
bne loop1
;
loop2 ldab #spaces
inx
inc count1
cmpb count1
bne loop2
;
;
count1 .byte 0 ; to compare spaces
keyPressed .byte 0
lineCount .byte 0
;
finish .end