semi-homemade micro

[Scott Stevens]

On Sun, 13 Nov 2005 17:42:02 -0500
Allison <ajp166 at bellatlantic.net> wrote:

> >
> >Subject: semi-homemade micro
> >   From: compoobah at valleyimplants.com
> >   Date: Sun, 13 Nov 2005 11:22:23 -0600
> >     To: <cctalk at classiccmp.org>
> >
> >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)
> 
> >=0D=0A  
> 
> Using RTF??   
> 
> >RISC would be out, due to difficulty of assembly coding, 
> >and 8086 seems a bit dull. 
> >Z-8000, TMS9900, and RCA1802 seem unavailable, and 6120 doesn't 
> >have many registers.=0D=0A     
> 
> 
> The 1802s are available as is the 6120 (spare time gizmos has kitted both).
> (Harris makes the 1802 and 6120.) old 1802 can be salvaged from EFjohnson
> made VHF mobile radios of early 80s vintage and 6120s from defunct 
> DECmateII/IIIs.
> 

(echoing a sentiment expressed here earlier)  Perfectly good DECmateIIs??

I have 6100s, too, if you want a scaled back version.  The 6100 is a great 'easy' first processor to use- all static CMOS with very lax timing requirements for the clock signal.  12 bits, though.  And, of course, the PDP-8 instruction set.