18 Apr
2007
18 Apr
'07
7:11 p.m.
Subject: CP/M survey
From: Mark Tapley <mtapley at swri.edu>
Date: Wed, 18 Apr 2007 09:09:45 -0500
To: cctalk at classiccmp.org
DEC Rainbow (8087, 832k (max for -A model), but that's irrelevant to CP/M-80).
Not true as the rainbow also ran CP/M-80/88 as it was a dual CPU (has a z80).
Allison
18 Apr
18 Apr
9:54 p.m.
On Wednesday 18 April 2007 14:11, Allison wrote:
I'd imagine that Mark meant that the amount of memory (832k) was
irrelevant to CP/M-80.
Pat
--
Purdue University Research Computing --- http://www.rcac.purdue.edu/
The Computer Refuge --- http://computer-refuge.org
Subject: CP/M
survey
From: Mark Tapley <mtapley at swri.edu>
Date: Wed, 18 Apr 2007 09:09:45 -0500
To: cctalk at classiccmp.org
DEC Rainbow (8087, 832k (max for -A model), but that's irrelevant to
CP/M-80).
Not true as the rainbow also ran CP/M-80/88 as it was a dual CPU (has
a z80). 
10:10 p.m.
--- Allison <ajp166 at bellatlantic.net> wrote:
Could it access more then 64k under CP/M-80? Don't
you mean CP/M-86? Not to nit pick...
I don't know about specific Rainbow revisions, but I
was under the impression the 'bow could go up to 896k.
Maybe I'm thinking of the Tandy 2000 via an 3rd party upgrade.
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Subject: CP/M survey
From: Mark Tapley <mtapley at swri.edu>
Date: Wed, 18 Apr 2007 09:09:45 -0500
To: cctalk at classiccmp.org
DEC Rainbow (8087, 832k (max for -A model), but
that's irrelevant to CP/M-80).
Not true as the rainbow also ran CP/M-80/88 as it
was a dual CPU (has a z80).
Allison 
19 Apr
19 Apr
4:55 a.m.
On Wed, 18 Apr 2007, Chris M wrote:
Could it access more then 64k under CP/M-80?
Don't
you mean CP/M-86? Not to nit pick...
I don't know about specific Rainbow revisions, but I
was under the impression the 'bow could go up to 896k.
Maybe I'm thinking of the Tandy 2000 via an 3rd party upgrade.
The Rainbow had a Z80, which was responsible for some of the
I/O. I think it ran the floppy disk. The CP/M-86 running on
the Rainbow could launch CP/M-80 programs on the Z80. So
the Rainbow was *both* a CP/M-86 and a CP/M-80 machine.
I had no CP/M-86 software and found its CP/M-80 implementation
disappointing (among other things, the IOBYTE wasn't implemented;
the DECmate II implemented the IOBYTE even though the PDP-8 did
all the I/O). The terminal emulation was also slow, although
not as bad as the Pro350.
I also tried to run MS-DOS on the Rainbow, but too much software
required PC hardware. I knew I was in trouble when the *command line*
version of Turbo C 2.0 could not run on the Rainbow because it
required some IBM PC ROM BIOS calls.
So I gave up on my Rainbow, and only regret it on those dark rainy
days when I'm feeling particularly morose.
--
roger ivie
rivie at ridgenet.net
6488
days inactive
6489
days old
3 comments
4 participants
participants (4)
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ajp166＠bellatlantic.net -
chrism3667＠yahoo.com -
pat＠computer-refuge.org -
rivie＠ridgenet.net