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F82E: return cassette sense in Zb
Used by the routines at F817 and F838.
F82E A9 10 LDA #%00010000 set the mask for the cassette switch
F830 24 01 BIT $01 test the 6510 I/O port
F832 D0 02 BNE $F836 branch if cassette sense high
F834 24 01 BIT $01 test the 6510 I/O port
This entry point is used by the routines at F817 and F838.
F836 18 CLC
F837 60 RTS
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