Virtual vs Physical memory (was Re: Designing around a 6502

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Thu Feb 13 16:50:31 2003

> Tony Duell wrote:
>
> > Oh, the more complicated machine has the same CPU (so can be justified as
> > 1, 4 or 16 bits) but all memory, ROM and RAM, is 16 bits wide, both
> > physically and logically.
> >
> > Anyone care to guess what the 2 machines are?
>
>
> I have not the foggest idea, but fancy calculator
> comes to mind because of the BCD math bit.

Right, and there is of course only one company that made fancy
calculators :-)

The 'simpler' machine is the HP9810. The successor to the HP9100, a
3-level stack RPB machine.

The 'complicated' machine also claims to be a calculator on the
nameplate. An HP9830. It runs BASIC, has a full QWERTY keyboard, 12K RAM,
etc. I'd call it a computer :-)

-tony
Received on Thu Feb 13 2003 - 16:50:31 GMT