You could use something like a Cisco 2501 which has the correct serial ports (2).? You would need to also get an AUI adapter as the 2501 predates 10Base-T.? Truly retro.? Maybe.
I see, this might be a problem for the time being... also it seems that the WIC-2T is no longer supported on the 1900 series, and the HWIC-2T are quite a lot more expensive, so I might need to postpone XOT on the router. I vaguely remember there being X25 support in the Linux kernel a while ago, is doing XOT on a Linux box an option? Or perhaps on some other older OS?
