Linux doesn't play with systems that don't support PC Card or PCI, and the 1400s only do PCMCIA. The only *nix that will come close to working on a 1400 is BSD, and even then it will take a whole lot os shoehorning. IIRC the version that supports the 1400 is a half step up from the 68k distro.
Any Mac with a card slot can support wifi, Orinoco has a great driver floating around the web. You'll want something like FTP server or VNC (maybe) to load images onto it but it should work fine.
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