I'm trying to create a looped program with TVTypewriter from "Apple I Replica Creation" as the base, that will quit when the user presses a specified key, rather than endlessly looping until the user resets. I've chosen '`', and my source code is below. For some reason, the program endlessly loops, behaving exactly like the TVTypewriter example. Can anyone show me what I'm doing wrong with this code?
Echo = $FFEF
Monitor = $FF1F
KbdReady = $D011
Kbd = $D010
JSR GetChar ; Read character from keyboard and store in accumulator
CMP #$60 ; is the character equal to '`'?
BEQ Done ; if char is equal to '`', then finish
JSR Echo ; print out what is stored in the accumulator
JMP Begin ; Just keep on going
LDA KbdReady ; Key Ready?
BPL GetChar ; Loop until key is ready
LDA Kbd ; Load Character from Keyboard
RTS ; Return
LDA #$24 ; load a '$'
JSR Echo ; print a '$'
JMP Monitor ; That's all folks