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'modem chips'
1996\06\03@094553 by Harrison Cooper

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Take a look at AMD's 'world modem' chip.  I cannot remember
the number off the top of my head, but these are used in alot
of TNC's in the amateur radio world.  I believe its limit is
possibly 1200 baud though.  Also look at EXAR.  Should be able
to get any 2400 baud part for cheap, but be carefull that you
don't design something in that is for production, as many of
these either will become obsolete as soon as the board is done
or just can't buy 'em anymore (anyone got a few thousand 64K
static rams in a zip package ?).  If you just need a few for
your home project, should be able to get several different
flavors sampled.  Good luck.

1996\06\03@102119 by Cobus deBeer

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At 07:45 AM 3-6-96 -0600, you wrote:
>Take a look at AMD's 'world modem' chip.  I cannot remember
>the number off the top of my head, but these are used in alot
>of TNC's in the amateur radio world.  I believe its limit is
>possibly 1200 baud though.  Also look at EXAR.  Should be able
>to get any 2400 baud part for cheap, but be carefull that you
>don't design something in that is for production, as many of
>these either will become obsolete as soon as the board is done
>or just can't buy 'em anymore (anyone got a few thousand 64K
>static rams in a zip package ?).  If you just need a few for
>your home project, should be able to get several different
>flavors sampled.  Good luck.
>
The AMD chip is the 7910 or 7911.  The 7910 is limited to 1200 baud.  Beware
of designing in these chips as supply is very erratic and at the moment
there is a shortage of these devices (again).

Beware of any modem chip that is aimed at the mainstream market (PC's)
because the manufacturers discontinue them as soon as they have a fater
version available.

Rockwell seem to keep some of their slower chips on the market for a long time.

Regards
CdB

1996\06\03@103034 by Wireless Scientific

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At 7:45 AM 6/3/96, Harrison Cooper wrote:
>Take a look at AMD's 'world modem' chip.  I cannot remember
>the number off the top of my head, but these are used in alot
>of TNC's in the amateur radio world.  I believe its limit is
>possibly 1200 baud though.  Also look at EXAR.  Should be able
>to get any 2400 baud part for cheap, but be carefull that you
>don't design something in that is for production, as many of
>these either will become obsolete as soon as the board is done
>or just can't buy 'em anymore (anyone got a few thousand 64K
>static rams in a zip package ?).  If you just need a few for
>your home project, should be able to get several different
>flavors sampled.  Good luck.


Harrison,

Thanks for the tips on AMD and EXAR. I've also found chips from SGS and
Silicon Systems. I saw an ad for SSi 2400bps modem chip that makes a
connection and sends 1000 chars of data in the time a 14400 modem
negotiates. Which is close to what I need.

craig

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