SwissMicros DM42n Precise Programmable RPN Calculator - HP-42S Clone

The DM42n, a flagship RPN calculator in our lineup, is a faithful tribute to the iconic HP-42S, often considered the greatest calculator ever created. Building upon the DM42, this improved version features significantly more RAM, a substantially faster CPU, and a modern USB-C port.

The DM42n is the most precise calculator on the worldwide market — second to none — and uses the powerful and proven RPN logic. The DM42n 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.

DM42n calculator features

• 34-digit mantissa for ultimate handheld precision
• Uses proven RPN logic
• Programmable
• Alphanumeric display
• Custom program labels execute upon a single key press
• Solver
• Integration
• Matrix operations
• Complex numbers support
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DM42n hardware features

• A USB-C connectorfor complete and easy calculator contents backup
• Sleek and sturdy hardware based on a stainless steel shell
• Multi-line program editor
• Fast STM32U5 CPU
• Single coin-cell operation
• Low power - long battery life

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Compare to other modelsCalculator Comparison DM41X, DM42n/DM42, DM32

User manualPlease find the onlineDM42 User made from stainless steel, matte black Physical Vapour Deposition (PVD) coated and laser engravedSoftwareOpen Source Free42 running on SwissMicros Operating System (no emulation)Processorultra-low-power ARM® Cortex-M33®, at max. 160 MHzFlash memory64 MBit additional flashFloating Point StandardIEEE 754-2008 128-bit floating point precision implementationISO ConformityISO/IEC TR 24732Display typemonochromatic ultra-high contrast (14:1) transflective memory LCD displayDisplay resolution400 × 240 pixelsDisplay active area58.8 × 35.28 mmDisplay dot pitch147 × 147 µmConnectivity (PC)USB-C, connects as USB mass storage deviceConnectivity (IR)IR Transmitter compatible with the original HP-82240A/B printerBattery type1 × CR2032 3V lithium coin cellSize77 × 144 × 12 mmWeight180 gWarranty5 years