queuePointerStart equ #$FD
queuePointerMinus1 equ #$FC     ;make this equal whatever "queuePointerStart" is, minus 1.
pushQueue:
STA 0,x
DEX
RTS

popQueue:
STX temp
LDX #queuePointerStart
LDA 0,x ;get the item that's first in line
PHA
    LDX #queuePointerMinus1
loop_popQueue:
    LDA 0,X
    STA 1,X
    DEX
    CPX temp
    BNE loop_popQueue
    LDX temp
    INX
PLA ;return the item that just left the queue
RTS

isQueueEmpty:
LDA #1
CPX #queuePointerStart
BEQ yes  ;return 1

SEC
SBC #1   ;return 0

yes:
RTS