Hi All Well, I dug out my H89. I turned it on, POP, turned it off. Smoke comes from the one side. Well, it looked like one of the 2.2 uf tantalums decided to give up. I snipped it with my diagonals and brought it up again. No smoke this time and all the voltages looked good. As the screen came back to life, the H: prompt showed. I next put one of my bootable disk in and typed B(CR). Success! It is alive. I tried a number of disk and some had problems. I tracked it down to the disk not rotating. I'm not sure at what point they fail to rotate. I don't know if the motor isn't turning, the belt is slipping or the clamp on the disk is slipping. It seems that many of the disk envelopes are tight. This should be a warning. Don't stack disk on their sides. Years ago, I'd place a second drive in the machine by installing two half height drives. The boot drive it behind the other drive so I can't see what the difficulty is with the other disk. It got late so I'll fiddle some more, later. I was looking at the HDOS stuff I have and I also found a LISP for the H89 as well. I'll work some more on making a image to serial to transfer this stuff to a PC. Dwight