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SwissMicros DM42 Precise RPN Calculator - HP-42S Clone

Home > Students > Scientific Calculators > SwissMicros DM42 Precise RPN Calculator - HP-42S Clone

SwissMicros DM42 Precise RPN Calculator - HP-42S Clone Image - Click to enlarge

We have a few customer returns of new units available in the conditions listed below. All include case and battery and are in excellent condition aside from the defects listed.

Good unit has a bit of dust under the screen and some wear on the case.
Very Good unit shows minor signs of handling.

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 maths 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.


  • 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 / 2.31" x 1.39"
  • Display Dot Pitch: 147 m 147 m
  • 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 / 3.03" x 5.66" x 0.47"
  • Weight: 180 g / 6.35 oz
  • Warranty: 5 years

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