Can an AE BS have older Macs on the wireless network?

Here' one for you all. Have my new BS running smoothly (can't believe how blazingly fast it is compared to my older Linksys DSL router). Anyway tried to connect one of my old desktops (DP500 G4,, remember those?) which has an airport card installed that it came with (i.e. old protocol?). This desktop could not connect either with the network with WP2 (or whatever) encryption (which was properly selected in the DP500 airport connection), despite the correct password, or to the guest network which is not encrypted at all, again despite proper selection. It tried to connect for a bit, then said it couldn't.
When the new 1000mbs ethernet switch arrives I will have enough ports to connect it via a cat 5 cable. Just curious it the BS Extreme is backward compatible.
Thanks. These forums are amazing.

Yes, it can and does. I just don't have an available ethernet port right now as the BS has 3 LAN ports (and the old Linksys router I replaced had 4). As soon as the network switch arrives, I will reconnect it via the ethernet port. I have plugged it into the BS via ethernet, and the connection works (w/ Internet, etc). It just won't successfully complete a connection to either (encrypted or guest) airport network.

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