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YSAV1 = $35
EOF = $FF
STKBAS = $0100
READC = $C080
LATCHC = $C081
KEYIN = $FD1B
MONRTS = $FF58

STDIN TXA
        PHA
        JSR MONRTS
        TSX
        LDA STKBAS,X
        ASL
        ASL
        ASL
        ASL
        TAX

        LDA LATCHC,X
REREAD LDA READC,X
        BPL REREAD
        STA YSAV1
        CMP #EOF
        BNE EXIT
        JSR KEYIN
        STA YSAV1
EXIT PLA
        TAX
        LDA YSAV1
        RTS
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