27 Dec
2012
27 Dec
'12
8:03 p.m.
Hi I started this when I was talking about the monitor. Although, the M24/6300has a
different connector, I've been told that the monitor was compatablewith either.The M20
had a 8086 board that was made to handle some DOS programs.To bad most couldn't use
the M20's color graphics.Olivetti also made a M20 compatable add on board for the
M20/6300to keep there customers happy.The M20 ws originally intended to use the memory
management chip fromZilog but it never happened. It used a mapping ROM that allowed
theZ8000 to use 128K within one segement by splitting the code space fromthe data
space.Still, even though the Z8001 could address 1Meg of memory, the M20 couldonly take
512K. This was because several parts of memory needed to haveto logical mirror address.
Especially those that were for code space only.These needed to have a data space address
as well to be able to loadfrom disk. This dual memory makes it neccesary to have a memory
maphandy when using the debugger. Break points need to be entered as dataspace and well as
any code editing.This memory mapping is partly why getting an emulator running has
beendifficult. One fellow in Germny is still working on it.Dwight
Date: Thu, 27 Dec 2012 20:31:30 -0500
From: mcguire at neurotica.com
To:
Subject: Re: olivetti m20 and CPM8000
On 12/27/2012 06:41 PM, Chris Tofu wrote:
Ah, I guess I thought it was rhetorical.
Ordinarily I'd be up for it, but the last time I saw the innards of
one of these machines was about 1985...I doubt I'd be of much help.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
I only
have the board set from a 6300. Want to help me hook it all
back together? The box was rusty so I chucked it. Should have saved
the floppy and hard drive at least.
Uh yeah. And a wire wheel and some paint for the chassis. WTF man?
It's not like the boards will fit in anything else.
C: You can make them fit in anything if you're determined.
You didn't answer my question though...