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Radio Shack TRS-80 Model II Reference Manual page 181

Disk operating system
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Technical Information
Get a character from the Keyboard
GET CHAR L.D
A,4
Rt;T
8
~rR
NZ, GET CHAR
CHARACTER IS IN REGISTER B
CODE 4
=
GET CHARACTER-SVC
JUI'1P
TO
t;~)C
DO AGAIN IF NO CHARACTER
217

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