The TMB14 Motherboard
TMB M 711
Transputer Motherboard User Manual
103
8.4.3 Control Configuration
Figure 72 shows the control circuit for the TRAM slots, and the
functions of the jumpers J8, J9, J10 and J11. This information is
tabulated below
Unlike most transputer motherboards, which have up, down and
subsystem control ports, the TMB14 has only up and down. The up
port can be switched between P2 and P4, and the down port can be
switched between P2 and P5. The down port always carries the
same controls signals as slots 1 to 7, so it is not possible to construct
a hierarchical control structure with more than one board.
J8
J9
Description
in
don’t
care
Slot 0 is controlled from the VMEbus
(default)
out
in
Slot 0 is controlled by the P4 connector
up port
out
out
Slot 0 is controlled by the P2 connector
up port
Table 38: Slot 0 control jumpers
Jumper
in/out
Description
J10
out
Down port on P2
in
Down port on P5 (default)
Table 39: Down port selection jumper
Jumper
in/out
Description
J11
out
Slots 1 to 7 are controlled from the Slot
0’s subsystem port
in
Slots 1 to 7 are controlled from the same
source as Slot 0 (default)
Table 40: Slot 1 to 7 control jumper
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