Date: Wed, 25 Aug 1999 09:09:43 -0500 From: Tim Tsai <tim@futuresouth.com> To: freebsd-small@FreeBSD.ORG Subject: Re: porting a DOS application (also DOC booting) Message-ID: <19990825090942.A259@futuresouth.com> In-Reply-To: <199908250906.CAA02321@dingo.cdrom.com>; from Mike Smith on Wed, Aug 25, 1999 at 02:06:33AM -0700 References: <19990825035448.A17461@futuresouth.com> <199908250906.CAA02321@dingo.cdrom.com>
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> You can't possibly have a "carefully calibrated delay loop" on a 386sx40 > that runs for 50 nanoseconds, since the clock cycle is five times that. Thanks guys for pointing that out. I knew I should've double checked before I post those figures but I didn't have the information handy. You are right - chances are with the timing of the CPU and the system + compiler overhead (if I use ppi and not writing to hardware directly) I probably can just skip the delay's altogether. I'll look at the timing again - I only remember that its timing requirement is such that it's low enough to make most PC timing sources unsuitable. I haven't worked on this program much in about two years hence the interest in porting it to PicoBSD since maintanence has become an issue. It is only sufficient to do the delay's from user space since I do not wish to jeopardize the serial communication which is of the utomst importance in this application. > > Lastly, anything to keep in mind before I base a $10,000 product on > > FreeBSD? :-) > > It's a good choice. Last job I had we based a $100,000+ product on > FreeBSD, and made enough money at it to keep us all fed and working. That's encouraging. Thanks! Tim To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-small" in the body of the message
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