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Model DM42

Flagship, Portrait
Model DM42


The DM42, one of our flagship line-up of RPN calculators, is a true homage to the legendary HP-42S, widely regarded as one of the most desired calculators ever made. The DM42 is the most precise calculator on the worldwide market - second to none - and uses the powerful and proven RPN logic. The DM42 runs Free42, based on a decimal floating-point math library and IEEE 754-2008 quadruple precision decimal floating-point, encoding numbers in 16 bytes and giving 34 decimal places of precision with exponents ranging from -6143 to +6144.


Specification Details
Construction Case made from stainless steel, matte black Physical Vapour Deposition (PVD) coated and laser engraved
Software Open Source Free42 running on SwissMicros Operating System (DMCP)
Processor Ultra low power ARM Cortex-M4F 80 MHz
Flash memory 32 MBit external flash
Floating point standard IEEE 754-2008, 128-bit floating point precision implementation with 128-bit transcendental function support
ISO conformity ISO/IEC TR 24732
Display type Monochromatic ultra high contrast (14:1) transflective memory LCD display
Display resolution 400 × 240 pixels
Display active area 58.8 mm × 35.28 mm
Display dot pitch 147 µm × 147 µm
Connectivity (PC) USB-Micro-B port, connects as USB mass storage device
Connectivity (IR) IR Transmitter compatible with the original HP-82240A/B printer
Battery type 1 × CR2032 lithium coin cell, 3.0 volts
Battery life Up to 3 years
Sound 4 kHz resonance frequency piezo-electric buzzer
Size 77 mm × 144 mm × 12 mm
Weight 180 g
Warranty 5 years