That's 160MB ESDI. 969/9/36 Easy: 820/6/17 MFM (seen them very often when it was around in past but now most of them have died off fast.) That's CDC. Yup. Don't be too bothered if it's bad. S0S failure is the loose rack gear held down by 2 female hex screws to slider table that heads rack mounts to without any locking provisions. Too common! I seen these 5 out of 10 ratio. I think that's in 34xx series. I think 30xx series is voice rotary type, 5.25" HH. Correct. All of zeniths in 1xx and 2xx series are passive slot type with cards in it. Well made and very compatiable. Had fixed few and very trouble-free for years, that helped my friend to go through unvirsity with a turbo 8088 XT desktop w/ 20MB in it after I replaced a socket on mem card! I don't know if my friend still have it. I love those CFC containing stuff to wash out cards. They came out like new. CFC now banned which I agree. The Z148 is low cost version of 2 nonstandard boards slimline machine w/ 5.25" HH bays side to side. 2 slots via optional daughterboard plugged into i/o board. Very common item, I saw about 5 in last 2 months. All parts (chips) can be used to repair the 1xx series passive bus desktops. Better display ur listing of cards here, it might pop out at us as interesting items. Wizard