HP -67 Owner's Handbook Manual page 294

290 Card Reader Operations
Now store the number 15 in I, press the B3 function, and load
the contents ofthe first 16 storage registers from the magnetic card
into the calculator, while preserving the contents of the last 10 storage
registers in the calculator.
Press Display
150 15.00 Merge address stored in 1.
a
Now pass side 1 of the data card through the card reader.
Display
Crd Calculator prompts you
that additional data must
be loaded from the card.
Passside 2 of the data card through the card reader. Review the new
contents of the storage registers and compare them with the old.
Press Display
Contents of X-register
returned to display to
indicate that all necessary
data has been loaded from
the card into the calcu-
lator's storage registers.
After automatically
reviewing the contents of
) th_e §torage registers, the
original contents of the
X-register are returned
there.
You can see that the contents of the storage registers addressed by
numbers 0-15 (that is, storage registers R, through Ry and secondary
storage registers Rg, through Rg;) have had their contents replaced by
data from the magnetic card, while the contents of the remaining
storage registers are preserved intact.