RPN-CALC DM-15C

news the complete voyager family will be available: dm-10cc, dm-11cc, dm-12cc, dm-15cc, dm-16cc
these clones all have the size as a credit card which makes them the smallest RPN calculators ever
watch an early clip on youtube
very interesting news are (also delayed but) coming soon ... stay tuned!

the next batch will be available by end of May 2012

differences to the original

this calculator is NOT by HP!
it does not have all the bugs found in the HP-15C LE, see that buglist!
runs on a battery saving LPC1114 ARM processor emulating the NUT processor
uses one CR2032 battery (220mAh) which should last for many years in OFF-mode (~2.5uA), or several weeks with the display turned on (~120uA), or upto 50 hours continously RUNNING (~4mA)
in a real test with an endless loop the LCD faded and got dull after ~36h, the CPU still continued.
the battery seems to recover after some minutes
runs up to 10 times faster than the original calculator introduced back in 1982 (sorry, due to some measure errors this number was wrong with 80x)
matrix display 132*16 pixels
miniUSB-RS232 features a command line interface for saving and restoring complete calculator state. external tools will be needed to decypher ...
reprogrammable through the miniUSB connection using FlashMagic (runs also under Linux/Wine)
LCD operating temp. -10°C to +50°C (The response time will be slow below -20°, and the background will become darker at high temperature operating.)

key combinations

keys	function	description
[ON]+[B]	benchmark	evaluatle benchmark compared with orig. calc
[ON]+[C]	serial console	switch to serial console (see below)
[ON]+[7]	change font	switch from 7segment to smooth font and back again
[ON]+[/]	key test	same as on the original calculator
[ON]+[*]	selt test	same as on the original calculator
[ON]+[-]	power reset	same as on the original calculator
[ON]+[+]		same as on the original calculator
[ON]+[.]	switch . and ,	same as on the original calculator

serial console

set calculator in serial console mode by [ON]+[C]
connect miniUSB cable to PC
open terminal program; on windows putty (or hyperterm if you are brave enough), minicom under linux
set terminal program to 38400,8n1 (no flow control)
de- and encode utility (html page with jscript) for RAM save and restore function follows...

battery replacement

firmware upgrade

get FlashMagic (avoid version 6.30)
connect with a standard miniUSB cable
install CP2102 driver under Windows, get it from here
select device LPC1114/302
choose correct COM port
set baudrate to 115200 or lower
select interface: none (ISP)
Oszillator (MHz): 12
in FlashMagic check "Use DTR and RTS to control RST and ISP pin" under "Options->Advanced Options->Hardware Config"
push and hold the button through the pinhole on the backside with a needle and press Start to flash the firmware. the button may be released after flashing has started
after flashing is done, hit Go under the menu option ISP - or power cycle by sliding a plastic under the battery

download use FlashMagic and press button through pinhole on the back of the calc (choose LPC1114/302)

DM-15CC firmware 'vanilla'	DM15CC_ROM_VANILLA_V3.hex
DM-15CC firmware 'mem80' with extended memory	DM15CC_ROM_MEM80_V4.hex
DM-15CC firmware 'mem1b' with even more memory *	DM15CC_ROM_MEM1B_V4.hex
DM-16CC firmware 'vanilla'	DM16CC_ROM_VANILLA_V3.hex
DM-12CC firmware 'vanilla'	DM12CC_ROM_VANILLA_V3.hex
DM-11CC firmware 'vanilla'	DM11CC_ROM_VANILLA_V3.hex
DM-10CC firmware 'vanilla'	to be released

* with the mem1b version you must not make more than 999 pgm steps... the unpredictable may happen.

firmware history
see all files

order form

contact get in touch ...
feel free to ask any question or make suggestions

programming	david[at]rpn-calc.ch
hardware / distribution	michael[at]rpn-calc.ch

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