13 Nov
2005
13 Nov
'05
2:48 p.m.
Subject: Re: semi-homemade micro
From: woodelf <bfranchuk at jetnet.ab.ca>
Date: Sun, 13 Nov 2005 11:04:38 -0700
To: General Discussion: On-Topic and Off-Topic Posts <cctalk at
classiccmp.org>
compoobah at valleyimplants.com wrote:
Uhm, what about 12bit[OS8 srt-8]? There are few othter word lenths
than those that are not unobtainium.
All the talk about building a mini from TTL got me
thinking about homebuild micros, and what one would look like if I decided to build one
(been playing with my IMSAI, too, which probably accounts for some of it)
Woodelf mutters:
The biggest thing I can think of is you only have two sizes of
computer today ... 16 bits or 32 bits of addressing. You can only get the 16 machines easly and resonable
source of a OS.
Explain that from your perspective.
The 68000 yes still works best with 64k addressing.
Oddly the only micocomputer chip I like ( other than the 6800/6809) is
National Semiconductor's 16032 is another chip that you could never get.
T-11 regular instruction set of the PDP-11. Not too hard to find.
Z8001 and Z8002s I have a few of. Z280, theres an interesting varient
of Z80 with 24bit MMU that looks like the DEC PDP11 MMU (even I&D!).
So you have to be a bit more descriptive.
Allison