I started with the 1802P that you wired. When Heathkit first came out with an 8080A based machine, the H8, I bought that and built it along with a paper tape reader/punch. This together with a casette player was how you loaded your operating system. It had a massive 8k memory. I also built the H9 Video Terminal and a printer. Later I souped it up to a Z80A with 64K memory and all the add-on boards from Trionyx. Once card was for computer graphics which could do some of the special effects for Wrath of Khan. I even got it to read double density floppies. Later I built several Z89 computers. Then IBM came out with their PC and made all of it obsolete. Then I went the same route everyone else did through 8086, 80286, etc. I still have the H8 and H89A.