MLSI-BA11-200

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The MDB Systems MLSI-BA11-200 is a third party QBus chassis, backplane, and power supply offering that is fully compatible with DEC QBus dual-height cards, and some quad-height cards. It includes an eight-slot quad height Q/Q backplane. Original backplanes appear to be Q18 only, but can be wire wrapped to Q22.

A small PDP-11/03 style front panel is provided, with typical RUN/HALT, RESET, and LTC switches. There are indicators for DC OK and RUN. The RUN lamp is actually an illuminated pushbutton switch, and doubles as the RESET switch.

The bare MLSI-BA11-200 configuration does not contain a LTC, bus termination, powerfail detect/sequencing, or even an interface to the front panel lamps and switches. These functions are provided by the MLSI-SMU, which is a dual-height QBus card. The MLSI-SMU also provides a pseudo switch register.

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