[1] The battery isn’t rechargeable. See Battery chapter below for battery
replacement and further info.
2.2. CPU Speed
CPU speed is 24MHz when running on battery (due to limited battery current) and increases to
80MHz when the USB cable is connected.
2.3. IR Printing
Calculator contains IR output and can print on HP 82240A/B infrared printer using emulation
through 'Thermal Printer' module (which is by default bundled in firmware).
Note that 'Thermal Printer' module has to be plugged-in first. See Module Plug-in for more
information.
Although the DM41X prints to the HP IR printer, the functions and behavior are the same as
implemented in the earlier 82143A printer, so see that Owner’s Handbook for details about usage,
behavior, flags, etc.
2.4. Internal FAT disk
The calculator has 6MB of internal flash storage formatted as a FAT filesystem that is used for
loading/saving programs and for backing up calculator state. It is accessible as USB disk when
activated via the menu 'File > Activate USB Disk >'.
Internal flash has limited amount of write cycles. While the lifetime with ordinary
usage could be dozens of years, an excessive number of writes will wear the flash
memory much quicker.
Worst case scenario, you would have to replace the flash chip, which is worth less
than $1. If needed, SwissMicros will replace the chip at no cost, but shipping costs
must be covered by the customer.
The datasheet mentions a minimum of 100,000 write cycles, which sounds like a
lot, but any change in the filesystem means overwriting at least part of the file
allocation table, which is stored in a static location.
Calculator comes with pre-filled FAT disk contents. In case the contents of the FAT area is lost it
could be always downloaded from the SwissMicros DM41X FAT files page. There is the contents of
individual directories accessible separately or the whole contents of FAT disk can be downloaded as
single zip file DM41X.zip.
There are several directories with special names (and purpose) on the FAT disk:
/BACKUP
Contains backup files written by complete calculator backup
3
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