Routines
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F817: wait for PLAY
Used by the routines at F34A, F533 and F841.
F817 20 2E F8 JSR $F82E return cassette sense in Zb
F81A F0 1A BEQ $F836 if switch closed just exit
cassette switch was open
F81C A0 1B LDY #$1B index to "PRESS PLAY ON TAPE"
This entry point is used by the routine at F838.
F81E 20 2F F1 JSR $F12F display kernel I/O message
F821 20 D0 F8 JSR $F8D0 scan stop key and flag abort if pressed
note if STOP was pressed the return is to the routine that called this one and not here
F824 20 2E F8 JSR $F82E return cassette sense in Zb
F827 D0 F8 BNE $F821 loop if the cassette switch is open
F829 A0 6A LDY #$6A index to "OK"
F82B 4C 2F F1 JMP $F12F display kernel I/O message and return
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