Date: Wed, 11 Jun 2003 02:13:04 -0400 From: Gary Corcoran <garycor@comcast.net> To: Andy Sparrow <spadger@best.com> Cc: freebsd-mobile@freebsd.org Subject: Re: FreeBSD laptop with: 56k modem, ethernet, Xfree86 Message-ID: <3EE6C870.FB1A7FE7@comcast.net> References: <20030611035011.54DBF1E0@CRWdog.demon.co.uk>
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Andy Sparrow wrote: > > Ironically enough, although they no longer ship a Lucent modem, IBM used > to, ... > and the ltmdm port works fine[0]. <snip> > [0] This superb piece of work is actually a loader that loads a software > image into the modem and then "talks" to it for you, if I understand > correctly - it's more like a "softmodem" than a "winmodem". CPU load is > not noticably increased at all with a PIII-600. You have your terminology backwards. A "softmodem" is when the realtime DSP functions are performed on your CPU, taking a good chunk of it. The "ltmodems" are so-called "winmodems", where the CPU just takes the place of the "controller", which handles things like interpreting the "AT" commands, and was typically something like a little Z-80 microprocessor (remember those? :) on-chip. So you can see that it takes next-to-nothing of a modern Pentium CPU to handle that, which is why you don't notice any increase in load with a "ltmodem"... Gary
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