I feel pretty silly posting this message, as I've been a firmware engineer since 1984! I have plenty of experience going inside a desktop PC. My laptop experience is quite limited though.
I've got an old laptop, a Gateway Solo P3C, 133 MHZ, that I am putting into a condition that it can be used to get online, very basically. It would be nice to put in a NIC card to allow for high speed Internet, but that's in a day or two. The hard drive is incredibly small, and FULL, so I'll get it a new hard drive and do the BIOS upgrade.
It was purchased used. I do not know the details. It was obviously used to get online in a work environment. It is in very good condition for its age.
It has a modem card installed, connected to COM3. I've looked and looked at the case, and opened everything I can find to open, looking for an RJ-11 connector. I cannot find it! Can someone tell me how to hook the phone cable to this PC even to test it?