More about math, calculators, RPN and programming - Printable Version +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: Not HP Calculators (/forum-7.html) +--- Forum: Not quite HP Calculators - but related (/forum-8.html) +--- Thread: More about math, calculators, RPN and programming (/thread-3721.html) |
More about math, calculators, RPN and programming - walter b - 04-26-2015 07:39 PM Since my most favourite super moderator told me today (in his irresistibly open way of communication*) I wrote too less about said topics, please allow me to point to
d:-) * We observe a conflict management which, as an intelligent former US-American boss of me used to say decades ago, is "management by seagulls" (he meant something different to what you find in Wikipedia about a similar term now). Such methods were unseen in the old forum. RE: More about math, calculators, RPN and programming - robert rozee - 04-29-2015 01:55 PM take a deep breath everyone, and think of your happy places! i've actually been following the 43S thread with interest, and the lamenting of the lack of progress. here seems as good a place as any to put forward a few ideas. we've seen a credit-card sized HP-25 emulator built using quite minimal hardware, and swiss micros are shipping their tiny HP-41 reinterpretation. the level of interest in both on the forums suggests to me that perhaps the time is ripe to look at someone doing a run of 'homebrew' HP-42S calculators. the same keyboard solution as used on Chris Chung's "HP-25C Eumulator". a standard 1602 LCD module for the display (16x2 characters, HD44780 based). 2xAA cells for power directly to processor and LCD module. a PIC32MX170F256B (28-pin DIP package) to run it all, with 256k flash and 64k RAM on board. and running Free-42 as the calculator firmware. i reckon that minimal additional components would be required beyond PIC32, display module, and keyboard switches. the processor has it's own on-board clock generation and around 20 spare I/O pins to connect to everything. the keyboard could be charlieplexed if needsbe to save pins. comments? cheers, rob :-) RE: More about math, calculators, RPN and programming - walter b - 04-29-2015 02:16 PM Hmmh, I wonder whether you wanted to post that in the "43s status" thread instead? Looks more fitting IMHO. d:-? RE: More about math, calculators, RPN and programming - robert rozee - 04-29-2015 02:31 PM no, no... the posting was made to the intended place. it was a quite deliberate attempt at distraction to defuse any reactions from 'others' to your posting and shift the subject to something non-contentious. rob :-) |