[Duo2400] Re: USR 56k Sportster external modem problem

[Chris Harjo]

  I think the problem is that Apple uses RS422 which is fast compared to 
the RS232 used on PC's.
one of the problems is data will have collisions going from a high speed 
device to a slower one, If you hook up a RS 422 device to a RS 232 port 
the 232 can't  keep up with the RS 422 device so it won't work.


joshkeady at msn.com wrote:

> Check the dipswitches on the rear of the thing.  The PC and Mac comm 
> settings are different.  I THINK that's the only real difference 
> between the two (besides the label.)  My 56k isn't here right now, but 
> if someone else could post the dipswitch settings from the back of 
> their working USR, that should do it.
>
> Probably. ;-)
>
> Josh
>
>
> On Sunday, December 14, 2003, at 10:27 PM, Gregg Eshelman wrote:
>
>>
>> I have an external USR 33.6 voice modem that will not
>> work properly with a Mac. I got it to dial but no
>> matter what cable I tried or software settings, once
>> it dialed through to the ISP, no more data was allowed
>> to pass in either direction.
>>
>> I have a much newer USR 56k voice modem with both
>> serial and USB connections. Currently it's running
>> on the serial port on my PC, had to update the
>> firmware to make it Win 2K/XP compatable. USR says
>> it will not work with a Mac and it probalby won't
>> due to something USR has planted in the firmware to
>> stop it from doing so. I dunno how they do it, but
>> USR has made several external modems that are NOT
>> software driven and require nothing but an INF file
>> for Windows (or just an init string for Linux etc)
>> that will not work with a Mac. Usually they had
>> an equivalent Macintosh version of the same modem
>> for a much higher price. Even nastier is some of
>> those "Mac only" modems work fine with a PC.
>>
>
>
>
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