The original KM11 was two boards
(W130 & W131) that was used in various PDP-11 computers and
devices. They are used in the diagnosis of problems by being able
examine internal states that are not normally visable on the front
The replica KM11 is a single board that is
plugged into an
extender board which is plugged into the appropriate slot(s) in a
PDP-11. Full documentation is provided including schematics and
Other people have created replica KM11
boards. One is from Tom
Uban. His design (and part of this design) is based upon work
Serveral accessories are now available
for the KM11. These include a light mask and a set of overlays
for the different KM11 applications.
KM11 Light Mask
A light mask
is available that is used to shield the light from the LEDs from each
other. It also serves as a good mount for any overlays that might
be used. It is machined from a solid piece of Delrin plastic for
strength and durability. Mounting holes are drilled and tapped
for 4/40 machine screws. When ordered all mounting hardware and
spacers are supplied.
of 8 overlays
for the different applications for the KM11. One set of 8 is
sufficient for any application up to 2 KM11 boards. It is
manufactured on 30 mil (0.030 inch) polycabonite plastic and are
precision cut to size.
Available seperately is an overlay for the RX01 and a set of 2 for
A "delux" version
of the KM11 is available that includes all of the relavent accessories
(it does not include the overlays for the RX01 or the RK11-C).
Documentation and Pricing
Documentation for the KM11 is here.
Pricing for the KM11 is here.