Welcome and VME

From: Eric Smith <eric_at_brouhaha.com>
Date: Mon Nov 13 15:32:32 2000

ard_at_p850ug1.demon.co.uk (Tony Duell) wrote:
> Anyway, the early HP handhelds tended to have custom processors which you
> may not class as microprocessors (they were multi-chip devices). The HP67
> (AFAIK) had a true microprocessor in it,

They started with the HP-35. All the first-generation HP handheld
calculators (and the HP-46, HP-81 desktops, the HP 3380A integrator,
the HP 1722A oscilliscope, and likely others) use the same chipset.
the processor consists of two chips, the A&R (Arithmetic and Registers)
and the C&T (Control and Timing).

The calculators contained other chips, including a clock driver, ROMs,
display drivers, and in higher-end models, RAM.

Some of the first-generation calculators such as the HP-65 and HP-80 used
multichip modules.


In the second-generation calculators, starting with the HP-21 and including
the HP-67, the processor was a single chip called ARC (Arithmetic, Registers,
and Control).

All subsequent HP calculators have used single chip microprocessors. Until
1984 they were all derived from the HP-35 architecture with various
enhancements. All HP calculators introduced between 1984 and 1998, and
the HP 39G, HP 40G, and HP 49G use variations of the Saturn processor.
Received on Mon Nov 13 2000 - 15:32:32 GMT