1 Oct
2002
1 Oct
'02
2:39 a.m.
Some think all 1802's use the SOS process, but I beleive that this is
not the case, its too expensive for
normal parts.
Some time back, I got a sample from an engineer at RCA, of a real
rad-hard 1802 with extra instructions
added to accelerate the Forth Kernel. I beleive that this is called
either an 1805, or perhaps an 1806.
So does anyone know what suffix is used to indicate the SOS process was
used on a given 180x chip?
J.C. Wren wrote:
Using www.cosmacelf.com, there are dozens of sites
devoted to the 1802.
There are emulators for Windows, Palms, and probably *nix. In fact, just
the other night I converted Frankasm to run under Linux (didn't take much,
but I also went through the 1802 and base code, making prototypes
modernized, and basically getting it to compiled with -W -Wall GCC flags).
Misc items: The rad-hard version of the 1802 was saphirre on silicon, from
what I've been told. You can pick up the RCA Studio II on eBay pretty
cheap. These are 1802 based. There is the Netronics Elf, Quest Super Elf,
and the RCA SA711 (I own 1 each of the latter, plus a couple of RCA Stdio
II's). One day I stumbled across about 110 pieces of CDP1802ACEs in Austin
Electronics. This got me on the 1802 kick, something I had always wanted to
play with, but never got around to.
It's a neat instruction set. Not perfect, but powerful. Lends itself to
Forth quite well, and I imagine that a port of GCC to it wouldn't be
outrageous (not compared to braindead architectures like the PIC, at any
rate). Lots of nifty support chips. CDP1823 256x8 RAMS, CDP1861 video,
there are port expanders, larger RAMs, ROMs, the CDP1854 serial chip (found
9 boards on eBay, payed my board builder a couple bucks to desolder them
all), some other stuff.
Expect to pay dearly for databooks. I won't mentioned what I've spent
lately, especially if Joe Rigdon won't (grin).
--John
-----Original Message-----
From: cctalk-admin(a)classiccmp.org [mailto:cctalk-admin@classiccmp.org]On
Behalf Of Ben Franchuk
Sent: Monday, September 30, 2002 22:11
To: cctalk(a)classiccmp.org
Subject: Re: Attention 1802 fans...
Ross Archer wrote:
The 1802 was used in quite a number of Amateur
radio ("ham")
satellites.
It was one of the first relatively "rad-hard" micros from
what I remember
reading, due in large part to its CMOS construction. I
guess those days
there were a few PMOS CPUs (8008, 8080) and a few NMOS CPUs
(Z80, 6502,
9900JL), and exactly one CMOS CPU -- the CDP1802. So it was
1802 or bust. :)
The other CMOS chip at the time was the PDP-8 on a chip.
The 1802 was I think was a special CMOS version that was
latch up and rad-hardened. Several CPU's are rad-hard but
the 1802 was the first cheap one.