Network win98 & XP with crossover cable?

I’m trying to network 2 standalone non-internet-connected PCs, 1 running Windows 98 and 1 running Windows XP using a CROSSOVER CABLE. The NICs and TCP/IP are working on both PCs.
No XP firewall; both have static 192.168.0.x addresses; same subnet mask; same workgroup name; ran XP’s home network setup on both PCs. Only result thus far: XP can see 98 in My Network Places. Neither computer can access a share on the other nor can they ping each other (yes, they successfully ping 127.0.0.1 and their own static IPs). Tried two different crossover cables. I’ve done this successfully before (XP—null modem—98 2-pc network) What is preventing these 2 PCs from networking?