Hand Held Products HHP-PE Setup Instructions

SET-UP INSTRUCTIONS FOR THE
HAND HELD PRODUCTS, INC. PORTABLE EPROM
HHP -PE
INTRODUCTION
To set-up the
HHP-PE for operation with
your
HP-41 requires
the set-
ting of eight switches on two DIP sockets found inside the plastic case of
the HHP-PE. The Portable EPROM comes with an 8k test set of chips set-up
for port 1. The first step is to plug the HHP-PE into the HP-41 oy
inserting the HHP-PE into an open port number 4 space. This may require
the removal of the plastic cover from the port 4 space. This is identical
to the way the card reader is attached to the HP-41.
The following procedure uses a function called "XROMTST" to fully check
a given 4k memory area in EPROM. By running this test two times, one for
the lower 4k and one for the upper 4k, you can quickly establish that the
HHP-PE is functional with your HP-41.
TESTING
The steps to follow are detailed below:
with the power ON and not in USER mode, press the digits 1 and 2,
press the XEQ key, then the ALPHA switch at the top right,
now spell out X R OMT S T on the keyboard,
press the ALPHA switch again,
the message "12 PR-2C TST" will appear,
a few seconds later the message "12 PR-2C OK" will appear.
Now repeat steps 2 thru 9 after entering the digits {1 and 9. You should
see the message "19 PD-{A TST" followed by "19 PD-1A OK" a few seconds
later. This brief test routine serves as a simple and easy test that the
HP-41 and the HHP-PE are working correctly together.
Should the message "12 PR-2C BAD" or "19 PD-1A BAD" appear, you should
call Hand Held Products, fne. at (704) S41-1380. Since all units are
tested several times prior to shipment, the chances of seeing such a "BAD"
message are quite small. If the above memory test procedure fails for any
other reason, check that your HP-41 is fully functional by itself and that
the "low battery indicator" is not illuminated. If the problem persists,
please call Hand Held Products, Inc. for further assistance.
INSTALLATION OF YOUR CHIPS
After successfully testing your HHP-PE unit, You may wish to install
your own custom set of EPROMs and configure the unit to your special needs.
This section is aimed at guiding you through each step involved in both the
physical installation and DIP switch set-up. Please read all instructions
in their entirety before continuing with disassembly.
The first step is to remove the HHP-PE from the HP-41 and position it
on a flat surface with the connector facing you. Opening the HHP-PE will
require a small Phillips screw driver to remove the two top screws facing
you. Note they are shown in Figure 1 on the following page. Radio Shack