There were a bunch of different systems in DEC’s PDP line, many mutually-incompatible (e.g. the PDP-1, 6, and 10 were somewhat compatible, the PDP-8 and PDP-11 were each their own complete universe, and then there were the 5, 9, 12, and 15, etc.) but they were all very well-designed.
My friend @fvzappa has a listing up on eBay for a PDP-8/m, which is a complete PDP-8/m minicomputer: https://www.ebay.com/itm/116163448173 This is an excellent turnkey system for joining the 12-bit world!
