Re: Hayes Compatibility

[et472@FreeNet.Carleton.CA (Michael Black)]

Ned Ludd (spam@luddite.ca) writes:
> Michael J. Mahon <mjmahon@aol.com> wrote:
> 
>> Almost all external modems use an AC input, since they need
>> both positive and negative supplies to do RS232 signals.
> 
> And now that I actually examine my adaptor _carefully_, I see it really
> is 9V AC 1000 mA, which means I probably still have several dud modems
> :(
> 
> Simon

When I recently got a 33.6K USR Sporster modem, it was especially cheap
because it had no power supply.  I did some searches and discovered it
used the same voltage as my old 14.4K Sportster modem (which I actually
bought new 7 years ago).  So I was okay right away.  The voltage marking
is not visible when it's plugged in, so I can't check what it says.

I do remember, though, reading some comments in the past that USR
did not use the same voltage in the AC adaptors for some of their modems.


  Michael