Does anyone have an idea what these IBM model numbers are like more precisely ?? 3380- AD/AE DL131 BE4 3380- AD/AE LK 3380- AD/AE LM135 AE4 3380 "E" DL 3380 "K" BP BK4 3380 "K" BP AK4 3380 "K" LM131 BK4 3380 "D" AD/AE KJ131 3380 "D" AD/AE JJ131 3390 "2" B2C 3390 "2" A28 I am particularly concerned about disks inside these machines; is there anything known ? Is any documentation available ? Thanks and regards John G. Zabolitzky