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experience, converters containing FTDI
chips work – others may not. Such a
converter is offered in the web e.g. at
http://commerce.hpcalc.org/usbserial.php
WARNING: As long as this cable is
connected to your calculator, it may
draw a considerable current from its
batteries. If your calculator happens to
hang during the flashing procedure
described
processor may be left running at full
speed, draining your coin cells while you
are trying to find out what is going
wrong. Thus, disconnect your cable
when you will not need it for the next
few minutes. For frequent flashing, an
external 3
to the outer and '–' to the inner battery contact. The flashing will work best with
a stable 3
B. You may use an ordinary micro USB cable for the connection to your PC if you
install a small custom board developed by Harald Pott, hosting a USB port. With
the
board
calculator will be powered through
that USB line while connected.
Thus you will not need the special
programming cable nor an hardware
serial port, and avoid the battery drain observed – but you will need to install this
board. See
Having prepared your calculator, computer, software, file, and cable, follow one of the two
alternative procedures A or B below for transforming an HP-20b or HP-30b into a WP 34S.
GENERAL WARNING: Flashing your HP-20b or -30b will erase the HP firmware –
your business calculator will then be gone. Its firmware will be replaced by the file
you downloaded. Thereafter you will have a WP 34S RPN Scientific – i.e. your
calculator will react as documented in this manual.
This also means your calculator will not do anything useful for you after step 6 and
before step 9 is successfully completed in the procedures described below. Your
calculator may even look dead – it is not, be assured. If the procedure is interrupted
at any time, don't worry: remember RESET will always turn your calculator off, and
shall turn it on
69
If – for any reason whatsoever – you want to return to the original HP business calculator firmware, you
can do so by sending the respective binary file instead of calc.bin or its siblings. An HP-30b file is
hosted on our website for example – note it represents the firmware status as known to us today and will
not be maintained.
70
... as long as the batteries are good – even if you do not see anything on the LCD.
WP 34S Owner's Manual
overleaf,
the
DC power supply may quickly pay for itself. Take care to connect '+'
V
supply – but as long as the voltage supplied exceeds 2.5
V
pictured
here,
Appendix H
for more information and a detailed installation guide.
70
– simply start over at step 1.
.
calculator
your
69
Edition 3.1
V
it is ok.
Page 148 of 211
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