Hewlett-Packard’s 9000 Series 300 (HP300) was a range of technical workstations based on Motorola 680×0 microprocessors. Superbly engineered in modular form, and ahead of the curve in terms of functionality, these workstations were used mainly as instrument controllers and for desktop technical computing. The HP300 series launched in 1985 with the models 310 (pictured below) and 320. It evolved through numerous variants of increasing power, concluding with the 38x models released in 1991. The series was officially obsolete as of 1997.
The definitive website dedicated to vintage Hewlett-Packard computers is the wonderful HP Computer Museum, which has excellent and wide-ranging archival resources. The present site is focused specifically on the HP 9000 series 300 and is for anyone interested in the history, conservation and restoration of these personal workstations.↫ hp-series300.net
Everything you could possibly ever want to know about the series 300, in one place. It’s incredibly detailed, and if you have your eyes on buying one of these machines, I urge you to keep this resource in a permanently open tab so you know what you’re doing.