Re: New Calc market Survey Message #5 Posted by Bill Wiese on 19 Sept 2002, 5:45 p.m., in response to message #1 by Dave
Dave...
RPN and an intelligent keyboard layout would be key for me.
Some form factors:
(1) very pocketable, like the $6.00 TI25X w/added durability and good keyboard.
(4) some midsize calc whose keycaps were replaceable, relabellable, etc. - combined w/firmware programs or user programmability - makes for flex. calc (think Calculated Industries stuff)
(3) a bit larger/bulkier - like an HP25 w/backlit LCD. I LOVE that feel. Calcs can be too small for desktop use.
(4) RPN sci desk calc w/printer. Large keys for 0-9/ Enter/'.'/EEX/CHS.
Functions:
When I need to do serious math, I have Matlab and/or Excel on a PC. A calc for me is for 'playing with numbers'. Fancy programmability and high speed are far less of an issue for me now. An HP49 is not useful to me. An HP41C or 42S level of programmability would be OK, with something like HP71B BASIC useful for larger programs (no reasone why two can't coexist).
Aside from programmability, the features of the old HP27 (LED) version are nice: sci + financial...
Base features:
- orig. 4-level RPN (not 28S/48S "RPN"!!!)
- hex/dec/oct/bin conv. + math easily used from
keyboard; maybe some HP16C features and IEEE
floating pt conversion functions.
- PV/FV/n/i/PMT & related financial functions;
Architecture:
- cheapie 8-bit microcontroller (80C51, H8, 68HC05/08, etc.)
w/internal RAM, ROM, timers, serial, GPIOs;
external serial EEPROM (24CXX/93C5X series)
for user prgrm storage.
Display:
- min. backlit one-line ASCII matrix LCD display
I/O:
- RS232 serial (5V drivers optional?) and 8bit GPIO
That's my 2 bits...
Bill Wiese
San Jose, CA
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