Date: Sun, 22 Oct 1995 21:46:09 +0930 (CST) From: Michael Smith <msmith@atrad.adelaide.edu.au> To: jgreco@brasil.moneng.mei.com (Joe Greco) Cc: msmith@atrad.adelaide.edu.au, davidg@root.com, root@spiffy.cybernet.com, hackers@freebsd.org Subject: Re: Bragging rights.. Message-ID: <199510221216.VAA00244@genesis.atrad.adelaide.edu.au> In-Reply-To: <199510201024.FAA29169@brasil.moneng.mei.com> from "Joe Greco" at Oct 20, 95 05:24:46 am
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Joe Greco stands accused of saying: > > The PC16550D (The "reference" part for 16550's) is specified to a 24MHz input > > clock. > > And here I always thought it was the National Semiconductor part that was > the "reference" part, because the 16550 was originally their fault. I still The PC16550D _is_ the NatSemi part. It supersedes the PC16550C, and thus the NC16550* range. The NS16550's haven't been available for some years now, AFAIK. If you have some you bought recently, check the fab date on them. > > The standard clock reference for this part in a PC is 1.8MHz. > > Decent serial card vendors (eg. Quatech) offer jumper-selectable clock > > dividers to allow you to pick your desired clock rate. > > I have yet to see this on any reasonably-priced card :-( Fortunately, > it's a cheap upgrade to do if you're handy with a soldering iron.. Likewise, which is why we fork out >$100 for these ones. (They're absolutely everything you could ever want in a serial card; jumperable IRQ overy every imaginable value, switch-selectable base addresses in increments of 8 from 0x0 to 0x400, optional open-collector interrupt outputs, jumperable DTE/DCE pinouts, 18MHz bit clock dividable by 1, 2 5 or 10... rah rah rah 8) > Joe Greco - Systems Administrator jgreco@ns.sol.net -- ]] Mike Smith, Software Engineer msmith@atrad.adelaide.edu.au [[ ]] Genesis Software genesis@atrad.adelaide.edu.au [[ ]] High-speed data acquisition and [[ ]] realtime instrument control (ph/fax) +61-8-267-3039 [[ ]] My car has "demand start" -Terry Lambert UNIX: live FreeBSD or die! [[
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