Probably an HP 16600/16700[1]. The control processor is basically a repackaged HP-PA workstation running a full version of HP/UX. Used X11 for remote access.

Probably an HP 16600/16700[1]. The control processor is basically a repackaged HP-PA workstation running a full version of HP/UX. Used X11 for remote access. The earlier 16500 had an optional, separate equivalent processor. I have a 16702A, which includes a front panel LCD and keyboard console. It's a beast. [1] https://www.keysight.com/us/en/product/16700A/logic-analysis-system.html https://www.keysight.com/us/en/product/16700A/logic-analysis...