Re[2]: Board diagnostics using computer

-----Original Message-----
From: Mark E Davidson <mark@basementarcade.com>
To: vectorlist@vectorlist.org
Date: Thu, 22 Mar 2007 09:07:11 -0500
Subject: Re: VECTOR: Board diagnostics using computer

>
> Cant answer your question Mark, but whatever he built, must work well.
> He has made himself a job selling board repair out on Ebay. Wish he
> would sell a kit of the interface and software.. I love when computers
> make things EASER :-)
>

well, you'd need i/o for the address & data, that's 24 lines.
r/w, mreq, i/oreq, reset is another 4.

irq's & reset are best on led's, clock would be ideal going to a frequency-counter.

for the i/o you could start here with this guy's usb i/o project.
http://www.cesko.host.sk/IgorPlugUSB/IgorPlug-USB%20(AVR)_eng.htm

use a bigger pincount atmel & have the entire 40pin header linked to i/o!
then you only need to scope the irq & clock.
or use a special subroutine in the atmel to try to calculate the clockspeed.
i'm not sure how feaseable that is - there are atmel frequency counters upto 8mhz but they may need input on a specific pin.

incidentally, i found this a while back!
http://minila.sourceforge.net/

now if someone is selling blank pcb's - !

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Received on Thu Mar 22 09:37:24 2007