W 0  Please type some input characters, then press escape.
x:      C' '
big:    H FFFFFFFF
str:    C'abcd'
char:   W 5
fizzle: A main
esc:    I 27 the escape character
c1:     I 1 
bell:   I 7  the noise character
main:   LDA big BREAK
        MUL str
        INP main
        STA char
        XOR esc
        BZE opsys
        LDA char
        ADD c1
out1:   OUT out1
        LDA bell
out2:   OUT out2
        BUN main