Treat with care - a Rockwell ACF hardware modem, probably the best modem chipset EVER - I assume it's an ISA card?
http://www.modem-help.com/chipsets.php?mid=122&nbd=1455
Drivers and firmware - the Firmware can be upgraded to support V90, but take care to find the right country and model.
If you can get it to respond as a COM port, you can ask it for info (using a terminal program) by ATI commands - ATI1 to ATI11 should deliver useful results, and if I recall my Rockwell's, AT&V1 reports detail of the last connection speeds - initial and ending.
Sorry to leave mine behind, but the Intel HaM controllerless (PCI) was a good replacement - enough done in hardware not to have the meteoric CPU usage of a softmodem.
Forget driverguide for modems, unless you enjoy wallowing through an ill-sorted collection - Modem-help is your first and only call (got me out of a spot many times)
The .co.uk version of the site has a feature that seems to have been lost from the newer (.com) version
http://www.modem-help.co.uk/chips/tblident.html#acf1
The ATI response info table - Now I'd expect the ATI6 response to be "RCV56DPF L8570A" - for the standard 1/2 Mb ACF - and the chip number confirms it to be the 1Mb (single mode - can be K56 or V90 but not dual)
There are some other unusual ATI responses which are practically maker specific - of course, if you can read anything that appears to be a model number on the board or label, or a FCC ID, then that saves a lot of detective work.
