SwissMicros' DM42

HP42S V.S. DM42

HP-42S V.S. DM42

Internal view of a DM42

DM42 internals


Closeup view of the PCB


DM42 uses STM32L476VGT6

OFFIMG example

Yokohama bay, JAPAN


"Behind the Great Wave at Kanagawa", Katsushika Hokusai


"Tama River in Musashi Province", Katsushika Hokusai

HP-42s Memory upgrade and overclock

• ABC2XY - Triangulation, tree known distance to the coordinates conversion
• AVR - Adjustable voltage regulator (such as LM317 or TL431) solver program
• BPFFL - Center frequency and Q of a Fliege band-pass-filter
• BPFMF - Gain coefficent, center frequency and Q of a multiple-feedback band-pass-filter
• E24 - Find nearest fraction(s) in the E24 numbers
• eW - exponent of Lambert W function
• Factr - Factor a positive integer
• Frac - Fractional approximation
• LCM/GCD - LCM and GCD of two positive integers
• LCR - Resonant frequency of a LC resonator
• LPFMF - Gain coefficent, center frequency and Q of a multiple-feedback low-pass-filter
• L• - Inductanse of a straight conductor of circular section
• L- - Inductanse of a straight conductor of thin flat section
• NTC10K - NCP21XV103 NTC thermistor Temperature V.S. Resistance function to solve
• OST - SOLVE alternative, numerical solution of a lenear equation using Ostrowski's method
• RI - Rational interpolation
• Pt100 - Pt100-1997 Temperature V.S. Resistance function to solve
• μZw, μwZ - Synthesize/Analyze microstrip transmission line
• Vn - Input refered voltage noise of an operational amplifier
• Z→S - Impedance Z to S₁₁ scattering parameter conversion
• ZdSL - Differential impedance of an edge coupled stripline solver program

www.swissmicros.com - DM SwissMicros
thomasokken.com - Free42 : An HP-42S Calculator Simulator
www.hpmuseum.org - The Museum of HP Calculators
STMicroelectronics