KM11-A Maintenance Set

The KM11-A Maintenance Set (also variously called the KM11-A Maintenance Panel, KM11-A Maintenance Console and KM11-A Maintenance Cards in some later DEC manuals) is a device used to perform maintenance activities on early PDP-11 CPUs and some early PDP-11 peripherals.

As produced by DEC, a KM11 consists of a W131 Maintenance Indicator Module plugged into a W130 Maintenance Connector Module; later a W131 and a W133 Driver Module. The W131 contains an array of 28 lights, three double-throw switches, and a single spring-loaded double-throw switch.

Overlays

A variety of overlays, specific to a CPU or peripheral, indicate the meaning of the lights, and the function of the switches, when used with that CPU or peripheral.

The CPUs which can use the KM11-A, and for which overays exist, are:

• KA11
• KB11 - all models
  • FP11-B
• KD11-A
  • KT11-D, KE11-E/KE11-F
• KD11-B

Devices which support the KM11-A, and for which overays exist, are:

• RK11-C (2 inlays)
• RK11-D
• TM11
• RX01