semi-homemade micro

[Allison]

>
>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:
>
>>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.

Uhm, what about 12bit[OS8 srt-8]?   There are few othter word lenths
than those that are not unobtainium.

>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