Date: Tue, 30 Jan 1996 15:55:53 -0600 (CST) From: Joe Greco <jgreco@brasil.moneng.mei.com> To: terry@lambert.org (Terry Lambert) Cc: freebsd-hackers@freebsd.org Subject: Re: Watchdog timers (was: Re: Multi-Port Async Cards) Message-ID: <199601302155.PAA06006@brasil.moneng.mei.com> In-Reply-To: <199601302143.OAA07490@phaeton.artisoft.com> from "Terry Lambert" at Jan 30, 96 02:43:47 pm
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> Go down to Radio shack and buy a copper dot-pad prototype board; they > are about $10. > > Then solder a ribbon connector on it, and run a ribbon cable off to a > bread board. > > Put optoisolators on the breadboard before connecting anything else. > > Alternately, if you can afford 2 prototype boards, put the isolators > on the prototype board and save yourself some breadboard space. > > Run the chips off the local (not the bus) supply. > > Drop your motherboard clock frequency to 8MHz on your test box so you > don't screw yourself from going over the ribbon cable at too high a > frequency. > > Voila, prototype card heaven. Actually, besides this being very ugly, I was referring to building production models, not prototypes... I need about six. :-) Since I don't have the facilities here to do any sort of PC boards, that leaves me with the ugly option of using PC prototyping cards (or other "build-n-go" solutions). All of which are expensive. However this is a great idea for those of us who want to experiment with building custom hardware and other exciting things. ;-) Ugly. But functional. ... Joe ------------------------------------------------------------------------------- Joe Greco - Systems Administrator jgreco@ns.sol.net Solaria Public Access UNIX - Milwaukee, WI 414/546-7968
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