IBM 5100 Basic Reference Manual page 184

trace program execution 33
two-dimensional arrays 67
TXT function keys 19
underscore character 41
USE statement 60, 112, 143
user file identification 35,37, 86
user-defined arithmetic functions 64
UTiL command 37
variables 40
5100 setup procedure 157
5103 printer 169
5103 printer setup procedures 165
5103 printer stacker installation 167
5106 auxiliary tape unit setup procedure 163
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