Olivetti Programma 101 Reference Manual page 14

20 The PRINT KEY prints the contents of an
addressed register.
21 The CLEAR KEY clears the contents of an
addressed register. When the computer is operated
manually, a depression of this key will print the number
in that register and clear it.
22 The TRANSFER KEYS perform transfer operations
between the storage registers and the operating
registers. (Refer to discussion of transfer operations for
the function of each transfer key.)
23 The ARITHMETIC KEYS perform their indicated
arithmetic function.
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