12 Jan
2004
12 Jan
'04
5:24 a.m.
"Barrie Carruthers" <barrie(a)precisionmicro.co.nz> wrote:
Hi am looking for an hp 85 cpu
I don't
think much of your chances of finding just the chip. There
are many of them around, but in most cases they are attached to an
HP Series 80 machine.
the cpu was made by capricorn , lots of
differen't definitions
or the cpu on the internet.
The chip was made by HP. Its product name was
Capricorn.
is there possibly a modern chip that could be used
in place of it ?
Ha! The HP Series 80 architecture specifies 4 12V clocks! and 6V
logic.
However, since we are talking about 20 year old technology, I am sure
you can EMULATE an HP-85 CPU using a modern processor.
any help or information would be appreciated
First a little self-promotion: lots of info on the Series 80 may be
found at www.series80.org, but the most important reference is the
HP-85 assembler manual (its in the CDROM collection of the Museum of HP
Calculators along with the HP-85 service manual: http://www.hpmuseum.org)
I have the HP-86 assembler manual, but I have not got around to scanning
it yet.
There are a couple of HP Journal articles on the Series 80
(also in the CDROM collection above), e.g.
HP Journal Aug 1980, pp. 18-22 (brief discussion of the chip set).
HP Journal Jul 1980, (whole issue dedicated to the HP-85).
HP Journal Dec 1982, (article on the HP-86/87 memory architecture).
HP Journal Jun 1983, (discusses HP-75 which has a CMOS version of the
series 80 processor architecture)
**vp