This chapter describes special key combinations that interrupt normal
HP-28S operation. These system operations include printing the dis-
play, adjusting display contrast, halting programs, resetting memory,
and performing diagnostic tests.
All system operations begin by pressing the
key. You can cancel
any system operation by pressing
I DEL I
before you release
The table below shows the keystrokes for system operations, followed
by a description of each.
Cancel System Operation
ION)I NEXT I
ION)I DEL I
25: System Operations