Maybe I'm misunderstanding, but I thought communication is what LAN cables are all about.
As to your question, I see two solutions: Either buy a USB-to-serial adapter for the modern computer, or a network card for the old one. If you can get a 10Mbps Ethernet line running, then you can debug using TCP.
I have in the past hacked Ethernet cables apart to turn them into serial cables (they are arbitrarily long eight-conductor cables, after all), but this only works if both sides can use serial.
BTW, my OS uses serial as a console. Serial is very easy to use in write-only poll mode.
_________________ Thou hast outraged, not insulted me, sir; but for that I ask thee not to beware of Starbuck; thou wouldst but laugh; but let Ahab beware of Ahab; beware of thyself, old man.
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