HP 35s User Manual

Getting Started 1-11
Undo key
The Undo Key
The operation of the Undo key depends on the calculator context, but serves largely
to recover from the deletion of an entry rather than to undo any arbitrary operation.
See The Last X Register in Chapter 2 for details on recalling the entry in line 2 of the
display after a numeric function is executed. Press
: immediately after
using
 or  to recover:
 an entry that you deleted
 an equation deleted while in equation mode
 a program line deleted while in program mode
In addition, you can use Undo to recover the value of a register just cleared using
the CLEAR menu. The Undo operation must immediately follow the delete operation;
any intervening operations will keep Undo from retrieving the deleted object. In
addition to retrieving an entire entry after its deletion, Undo can also be used while
editing an entry. Press
: while editing to recover:
 a digit in an expression that you just deleted using

 an expression you were editing but cleared using 
 a character in an equation or program that you just deleted using  (while
in equation or program mode)
Please note also that the Undo operation is limited by the amount of available
memory.

HP 35s Specifications

General

Type	Scientific
Form factor	Pocket
Product color	Black
Digits	14 digits
Display number of lines	2 lines
Keyboard type	Alphanumeric
Menus and prompts	Yes

Weight and Dimensions

Dimensions (WxDxH)	157.9 x 18 x 82 mm