A SOL-20 assembled from four vendors’ parts has an unidentified power supply

Sol-20 Terminal ComputerProcessor Technology Power SupplyS100 Memory CardNos Keyboard Assembly
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A 1976-era SOL-20 came together as one machine for the first time in 2024, assembled from four vendors’ parts, according to its restorer. One vendor supplied the chassis, case and power supply; others supplied the motherboard, an unused old-stock keyboard assembly and an S-100 memory card. The fit was not straightforward: the restorer says they had to cut away built-in chassis standoffs to install a regular SOL-20 motherboard.

The power supply is an original Processor Technology unit, but the restorer could not identify its model, even after asking a vintage-computer forum. They also noticed that it lacks mounting holes for the internal side panels normally seen in SOL-20 units. Those details make this more than a matter of collecting compatible parts: the hardware itself raises questions. Why does this chassis differ from other SOL-20 units?

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  • What is the model of the unusual power supply? : Still exploring
  • Why does the chassis differ from other SOL-20 units? : Still exploring

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