Archiving hardware projects

From time to time I do some project involving old hardware that requires connecting it to a modern computer. For example, Getting the KIM-1 to talk to my Mac Resurrecting a Dataman S4 PROM programmer Ripping old mini DV video tapes on a Mac And I've come to the conclusion that archiving the related hardware is important. For example, I got this Dataman S4 talking to my Mac using a few different…