A few years back, I got a IMSAI 8080 computer along with all the basic system boards, dual 8" disk drives, some CP/M and BASIC disks, and two MIO rev. 2 boards, and most of the system manuals. I've tested the system with the example programs that are in the manual and the system seems to work just fine. Using the MIO rev. 2 manual, I set the jumpers to 1200 baud, and I connected the SIO port to the DB25 port coming out the back, the DB25 port to an adapter which turns it into DB9, and then the DB9 is plugged into a USB adapter and is in the back of my PC. Using a serial terminal, I set up a connection to USB-TTY at 1200 baud, no parity. I turn the system and the disk drive on with a CP/M disk in it, and hit run. The computer seems to react to the disk drive being powered up, but nothing at all is displayed on the terminal. Can somebody help me troubleshoot my system so I can get the IMSAI up and running?