I am the original purchaser and constructor of this famous vintage computer as a young nerd. System works for all switches and apparently lights as well as fan. I tested all operating voltages and the electrolytics look good.I no longer have the cassette tape or floppy to run programs but I can see that it can run boot. This has the advanced dual CPU board, a CompuPro 8085/88. Other boards powered up on the bus are Cromenco TU-ART with dual serial and parallel ports, and CompuPro Disk1 for your floppy, RAM17, SystemSupport1, and a bus terminator board. Finally, I included a CompuPro Interfacer1 dual channel RS232 which blew some small electrolytics that I didn\'t get around to replacing. I used a toggle switch on the back for power; don\'t remember why. There is also a battery backup for the SystemSupport board.Let me know if you want more info or photos. This is sold as a collectable as is. It has been a really long time since I programmed with this to verify all operating functionality. I did have it nicely stored in my company though; note no rust or damage. Serial number is 1009835. I have the main manual and some CompuPro manuals to include.