10 Feb
2011
10 Feb
'11
8:41 p.m.
On Friday 24 December 2010 09:19:41 pm Fred Cisin wrote:
On Fri, 24 Dec 2010, Alexandre Souza - Listas wrote:
Yes! I remember one time a guy who'd acquired an Osborne 1 with no floppies, so we
assisted in his acquiring some. There was a user group that met in the building as well.
He was astounded, coming from peecees, how small all those utilieis were.
And as reasonably zippy as those 4 MHz machines were, it should be interesting to see how
one would be with a faster part -- I remember hearing about a 20 or 25 MHz Z80 a while
back, and some other implementations that ran even faster.
What is needed to CREATE (and not build) a
CP/M compatible computer?
Now it got me puzzled. I have some circuit adaptations of MSX and TRS-80
computers, as minimal computers to run CP/M code. But what is needed -
beyond Z80 and 64K of RAM - to run CPM? Is there any kind of doc discussing
it?
You don't NEED 64K. CP/M can run in 16K. But, if you want a decent sized
TPA, you can have 50+ K TPA with 64K, or even 63K TPA with 128K.
8080. Yeah, a Z80 is NICE. and FAST! and some aps insist on it.
I think I have a couple.
But, CP/M can run on 8080, 8085, and anything else,
including emulators that
can handle 8080 code.
It's too bad that nobody brought up CP/M on the Kyoceras (Radio Shack
model 100, Nec 8200, etc). THAT would have been a project.
Or on the Epson RC20!
That would indeed have been interesting. The Epson PX-8 that I have is the furthest
I've been in that direction, a model 100 would have been interesting to play with as
well.
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin