"The Bus Interface Board (BIB) is a 100 x 160mm Eurocard
which plugs onto the standard Acorn computer bus. Using it a card frame and
back-plane carrying Acorn cards can be interfaced to other machines, for
instance AIM65, KIM etc., giving users of these machines access to the wide
range of control and interface circuits manufactured by Acorn. A 40-way flat
ribbon cable connects to the front of the BIB and on to the rear of the AIM65,
this cable carries the data, address and control lines from the AIM and thus
allows the 6502 processor on the AIM to control the Acorn cards in the rack.
Logic circuitry on the BIB allows memory blocks in the Acorn card frame to be
located into the AIM65 address map.
The BIB is available in two configurations. The minimum
configuration provides an interconnection system so the AIM65 can be connected
to the Acorn back-plane and memory blocks on the back-plane connect directly
into the AIM65 address map. In the maximum configuration data bus buffering is
also provided together with block select circuitry so that the Acorn cards on
the back-plane can be located into different blocks in the AIM65 address map.
Buffering for the sixteen address lines is already present on the Acorn
back-plane.
Also on the BIB is an area of pads on a 0.1 inch matrix on
which additional circuitry can be constructed by the user.