Duo internal modem VS DuoDock modem?

[Dan K]

I wrote:
>The Duo modem is like a WinModem, partly (largely?) in SW, plus if you've
>ever looked at a modem 'card' inside a dock, it looks suspiciously like
>the same part inside the Duo itself. I don't actually know the answer to
>the 'will the dock modem work without the Duo's modem card being
>installed?' question but I'd say one cannot tell without actual testing.

then Jutso wrote:
>Looking at the service manuals, I see that the illustration of the parts
>in question is not the same -- the internal modem (Apple's, anyway) has
>its connector all along its side, whereas the Dock "modem" has a much
>narrower connector to the Dock logic board. The Dock "modem" is also much
>thinner from side to side than the int. modem.

Arrgh, my mistake for my choice of wording there. I meant the components 
on the boards look similar, not that the boards themselves are 
interchangable.  Sorry about that! They are not, AFAIK, though if I 
wasn't too lazy to go look I'd know in a few short minutes.

With the idea that the expansion conn. signals (the modem related pins 
anyway) reveal _something_ relevant, as usual here's more info than 
anyone really wants:

Main expansion connector signal assignments

68             +5V MODEM       +5 V power for modem
69             LINET/R         Modem DAA line talk/receive
75, 76,   
 151, 152      DAA GND         Modem ground
143            DAA CNTLF       Modem DAA control
144            DAA ID IN       ID input from 152-pin connector to modem 
card
145            /RING DET       Ring detect signal from the modem DAA
146            /RB DVR         Modem relay B driver
147            /RA DVR         Modem relay A driver

I have no idea what it all means, however I _DO_ know there's a clue in 
there somewhere!

Dan K


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