288 external modem for Mac - init = AT&F1&K3 (hardware flow control).
The Supra manual states AT&F1 is the proper init (but I'm not convinced). That init string does not appear to work for all situations. I had one case were the ONLY string that would work was AT&F and the port speed had to be set to 28800. To force a slower connection, add (to the init string) +MS=11,1,, ie +MS=11,1,9600,14400 AT&F1 is the proper init string (according to Supra documentation).

The best init string for PC's will contain AT&F2. For example:
AT&F2&C1&D2

I have noticed problems recently with Supra modems that have a Rockwell Voice 33.6 (RCV336) chipset. The problem is that the modems connect at 33.6 every connection, but disconnect after a few minutes. The only solution that I have found to work reliabl y is to force the modem to connect at a lower speed. To do this add the following to Windows 95's extra settings:
+MS=11,1,26400,28800
This will force the modem to connect between 26,400 and 28,800
Some newer Packard Bell supplied modems (with the same chipset) seem to suffer from the same problem.

This is a note that I received from an Internet user 8/27/96...

... I happened to think a situation I ran into might help some one. Here it is. The ISP I use changed to the new US Robotics 336 modems. For some reason the modem I have (Supra Express 288i PnP) wouldn't connect. While looking around I found some int strings to try the one I use is AT&F2+MS=74 it forces the modem to the V .34 protocol and it works great. I have the fastest connection I have ever had. Just thought it might help some one...