10 Jul
2009
10 Jul
'09
11:19 p.m.
Namens Alexandre Souza wrote:
> Lemmesee if I understood that: The HP12C I buy
nowadays
> is an arm core running Eric's emulation?!
>
If you buy a 12C and it takes two coin cells (vs. one coin cell, or
three button cells), then it uses an Atmel AT91SAM7L128 processor with
an ARM7DTMI core, and runs a simulation of the original Nut processor
architecture.
Rik Bos wrote:
The first versions ran on a saturn processor the same
as the HP-71B.
The HP-12 is the only Voyager witch survived the 90th ;-)
No shipping 12C calculator ever used the Saturn processor. The 12C and
the rest of the Voyager family were designed before the Saturn was
ready, so they used a version of the Nut processor from the HP-41C
family, modified to run at a lower voltage.
Over the years, they redesigned it for cost reduction several times, but
until the recent switch to the Atmel ARM microcontroller, they were
using ASICs.
HP ACO division (RIP) reportedly did design a Saturn-based 12C, but it
was not put into production.
Eric