HP 35s User Manual page 232

If I/J contains:
I<-32 or I>800 or variables
undefined
J<-32 or I>800 or variables
undefined
The INPUT(I) ,INPUT(J) and VIEW(I) ,VIEW(J)operations label the display with the
name of the indirectly–addressed variable or register.
The SUMS menu enables you to recall values from the statistics registers. However,
you must use indirect addressing to do other operations, such as STO, VIEW, and
INPUT.
The functions listed below can use (I) or (J) as an address. For FN=, (I) or (J) refers
to a label; for all other functions (I) or (J) refers to a variable or register.
14-22
Programming Techniques
-1
.
.
.
-26
-27
-28
-29
-30
-31
-32
0
.
.
.
800
Then (I)/(J) will address:
variable A or label A
.
.
.
variable Z or label Z
n register
x register
y register
2
x register
2
y register
xy register
Unnamed Indirect variables start
.
.
.
The Max Address is 800
error:  
error:  