IBM 5110 Basic Reference Manual page 9

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You can enter numeric data conveniently by using the calculator arrangement of numeric
keys to the right of the alphameric keys. You can also enter this data by using the
numeric keys above the alphameric keys. The arithmetic operator keys, located on the
right of the keyboard, are also on the alphameric keys.
Note that on a BASIC-only keyboard (Figure 4) upper shift APL symbols above the
alphameric characters can be entered as data, even though they do not appear on the
BASIC keyboard.
When any of the keys are pressed, the characters entered appear in the input line on
the display screen.
BASIC statement keywords are printed on the front of the alphameric keys. These
words are entered starting at the current cursor position when the CMD key is held
down and the corresponding key is pressed (in standard BASIC character mode).
Operation 5