I resumed efforts to get the PC Card (aka PCMCIA) Ethernet interface configured to enable LAN / WAN access. With some guidance from online forums about configuring Linux on older hardware, I got the Ethernet card working (as it did under Windows ME that I inherited with the PC). Here is a photo of the screen showing the Bell Ringers home page displayed by the SeaMonkey browser that is part of the Puppy Linux distribution.
I've now verified the PC's ability to access the Internet via Linux, for web browsing and email access. Next I will work on achieving Java applet operation.