The M series FLIP-CHIP boards were used in
the PDP-8/I introduced in 1968 and peripherals. They were also
sold as building blocks for custom hardware. These board replaced
the function of the R series boards
using modern TTL IC's instead of the discrete transistor logic. The later
board in this series were special purpose boards for the computers and
peripherals and not sold as building blocks.
The M series board were first listed in the 1968 logic handbook.
More M series information
The M series boards have Magenta handles.
M Series Features:
The following picture links below also have descriptions of what is show in the pictures.
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M700 Manual Timing Generator ( 45K) back of board ( 61K)
M707 Early Teletype Transmitter ( 74K) back of board ( 70K)