semi-homemade micro

[Allison]

>
>Subject: Re: semi-homemade micro
>   From: "Chuck Guzis" <cclist at sydex.com>
>   Date: Sun, 13 Nov 2005 17:33:32 -0800
>     To: cctalk at classiccmp.org
>
>On 11/13/2005 at 5:19 PM woodelf wrote:
>
>>>Want to try an emulation project?  take a 8048 or 49, strap EA 
>>>(uses external rom then) and write a program to make port 0 and 
>>>some latches and stuff on the bus port look like a version of
>>>your favorite CPU of any word length.  Sure it will be slow 
>>>(8049 @11mhz run instructions at 1.3us) but different! hang 
>>>ram rom and IO even front pannel on the emulation and you have
>>>anything you can imagine and fit in 4k or eprom and 128bytes 
>>>of internal ram (8049). 
>
>Why not something like an Atmel ATMega?  Fast and cheap.

That would work too.  I picked 8049 or 8051 series as they are also 
cheap often found in useless  equipment and tools to work with them 
are free and I have a coffee can full of them. ;)

At the other extreme a PIC might do a it too. The idea remains
no differnt than using a PC to emulate Xyz save for a smaller 
machine IE: a chip maybe slower and embeddable.  The side benefit is
the "microcode" can have a debugger built in.


Allison