Indirect Storeand Recall - HP -67 Owner's Handbook Manual

Using the I-Register for Indirect Control 229
As with all error conditions, pressing any key clears the error and
returns to the display the last value present there before the error.
Press Display
RIS
By using 53 (@, you have tremendous versatility in the types
of output formats your HP-67 produces. With 53 [@ instructions,
for example, the width of a displayed number(that is, the number of
characters displayed) can be made dependent on data.
Indirect Store and Recall
You can use the number in the I-register to address the 26 storage
registers that are in your HP-67. When you press (@, the value
that is in the displayis stored in the storage register addressed by the
numberin the I-register. ([ addresses the storage registers in a
like manner, as do the storage register arithmetic operations
B0, 608 0,50 80, and 58 B [@. (If you have forgotten
the normal operation of the storage registers, or of storage register
arithmetic, go back and review section 4, Storing and Recalling
Numbers, in this handbook.)
When using B (@, (@, or any ofthe storage register arithmetic
operations utilizing the () function, the I-register can contain numbers
positive or negative from O through 25. The numbers O through 9
address primary storage registers R, through Ry, while numbers from
10 through 19 will address secondary storage registers Rg, through
Rgo. (You do not have to use the function with (@ .) Numbers
20 through 24 address storage registers R, through Rg, and with the
number 25 in the I-register, addresses the I-register itself!
The diagram on the following page should illustrate these addresses
more clearly.