HP1973 project brings the HP-45 back to life, not only with full emulation, but showing the ROM workings under the hood.

Beautiful.

#hpcalc

https://hackaday.com/2023/07/24/hp1973-project-highlights-workings-of-hp-45-calculator/

Show me your favorite notation 🙂 I’ve used ‘engineering’ (aka exponent is always increments of 3) and 4 digits after the decimal point since I graduated from the university almost 30y back 🙂 It’s come to the point where I find looking at other notations difficult 😂 #engineer #pocketcalculator #hp #hpcalc #hpcalculator

Acquired: HP 50g Graphing Calculator
Balance -103 EUR (w/VAT)

#hpcalc

I did some Nonpareil (HP calculator microcode simulator) work, and HP calculator ROM reverse engineering, over the weekend, but it doesn't seem like I got anything significantly accomplished. As usual. Maybe next weekend.
#nonpareil #hpcalc #rpn

I did some Nonpareil (HP calculator microcode simulator) work, and HP calculator ROM reverse engineering, over the weekend, but it doesn't seem like I got anything significantly accomplished. As usual. Maybe next weekend.
#nonpareil #hpcalc #rpn

Any calculators enthusiast? Recently got this pocket programmable HP 11C scientific calc.
#hp #hpcalc #11c

New geek toy: HP Prime V2 (rev. C, G1)
#Calculators #HPCalc

From the 70's, Shanks' SQUFOF algorithm for prime factorising using square forms, with a mention of the HP-65...

"""
...to prove this I had only a hand-held HP-65 with its very small memory (100 steps in the program). Obviously, one cannot put the huge BRIMOR on such a machine. But one can put on the simple algorithm...
... factor the 19-digit N₀ as
(22) N₀ = 139001459 · 8294312261
even though the HP-65 only computes with 10-digit numbers.
"""

https://homes.cerias.purdue.edu/~ssw/shanks.pdf

#hpcalc #hp65
#primality