NEW
1 A=KEY
2 IF A=0 1
3 A=A-65
4 IF A=0 10
5 PRINT "?"
6 GOTO 1
10 PRINT "A"
11 GOTO 1
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chkchar.tmb
check characters received at
serial port, display an "A" if
the character is an "A",
otherwise display a "?"