HP HP-28S User Manual

When you use the HP-28S with a printer, the calculator sends in-
formation to the printer via an infra-red signal. This signal is emitted
from the printer port and received by the printer. Printer operations
are described in chapter 15.
Turning the HP-28S On and Off
Press 1 ON 1 to turn on the calculator. The HP-28S has Continuous Mem-
ory, so all data in the calculator, including the contents of the display,
are unchanged from the last time you used the calculator.
While
the calculator is on, 1 ON 1 acts as the ATTN (attention) key, as
printed in white below the key. Pressing ION 1 clears any text you've
typed in and stops programs.
Press .1 OFF 1 to turn off the calculator. (Tress .1 OFF I" means "press
the shift key., then press the key with OFF printed above it.")
If the calculator is inactive for about 10 minutes, it automatically turns
off to conserve energy. Press 1 ON 1 to turn it on again.
Clearing All Memory (Memory Reset)
You can restore the calculator to its initial state by resetting memory.
All
information in the calculator is lost. Any modes you've changed
(number display format, angle mode, and so on) are restored to their
default settings.
To reset memory:
1. Press and hold 1 ON I.
2. Press and hold [JE[J (in the upper-left corner of the right-hand
keyboard).
3. Press and release [EJ (in the upper-right corner of the right-hand
keyboard).
4. Release [JE[J.
5. Release 1 ON I.
20 1: Getting Started

HP HP-28S Specifications

General

Brand	HP
Model	HP-28S
Category	Calculator
Language	English