22 Dec
2012
22 Dec
'12
4:22 p.m.
On Sat, 22 Dec 2012, Chuck Guzis wrote:
On 12/22/2012 02:47 PM, Tony Duell wrote:
Indeed, someone in Switzerland is doing something like that. See
http://www.swissmicros.com/
--
David Griffith
dgriffi at cs.csubak.edu
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?
But, if you want to re-code the RO, then either
you have to find a way of
making the ROM i nthe R2D2 chip invisible to the processor (which is not
trivial, given that the address and data is transered serially over the
same line (ISA) and that this singal is needed fro the otehr sections of
R2D2) or you haev to somehow rebuild the functions of the RAM and display
driver. Then you have to interface an EPROM or sinmialr to the Nut bus,
this is essetially the same as making a ROM box or MLDL unit for an HP41.
And finally you have to fit it all in the case.
You know, I still find calculators darned handy, particularly when I'm
working on the system. My HP16C is never far from my mouse, so both are
within reach.
Nowadays, it should be pretty simple for one to take a micropower MCU such as
a TI MSP430 series chip that also has an LCD interface on it and turn it into
just about any specialized calculator that one could imagine. Select an FRAM
variety and you won't even need any power to keep memory alive.