This system was heavily customized by its former owner, including a home-built serial board (wire-wrapped). The other boards are a Cromemco Z80 CPU board, Fulcrum Omniram 64KB Static RAM, Morrow Disk Jockey 2D/B controller, Solid State Music IO-4 serial/parallel board, Scitronics real-time clock board and a Compupro Active Terminator board. The system was fairly dirty on the outside, but cleaned up nicely.

This system hadn't been powered up for 20 years, so I took precautions with the huge electrolytic capacitors in the linear power supply. I connected a 6.8K power resistor in series with each capacitor and a variable DC power supply, then ramped up the voltage in steps while monitoring the current. Once I got them up to their rated voltage, I let them sit for several hours. I don't know if it was necessary but when I powered up the system, nothing exploded.

To check out the system, I installed only the active terminator card, the 64KB RAM and the ZPU. After I disabled the Power On Jump (POJ) on the ZPU card, I was able to use the Deposit and Examine switches on the front panel to enter a short program. It does nothing more than scan an LED across the front panel output buffer (Cylon style), but shows that the system generally works.