ajp166 at bellatlantic.net
Sun Nov 13 20:20:19 CST 2005
>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.
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