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provide data to and from the respective drive units. The
"Multiplex" connector routes control signals to each drive
in a daisy-chain fashion. Additionally, the "Multiplex"
connector returns disc-drive status information to the
computer.
It should be pointed out that peripheral devices controlled
by integrated adapters associated with processor states 0,
1, and 2 do not attach to the
1/0
panel. Rather, those
connections are made directly to the associated adapter
by means of a connector slipped over the wire-wrap pins
on the logic chassis. These devices include card readers,
card reader/punches, and all external communication-line
EPO EXTERNAL
USED WHEN MRX/50 IS TO BE SE·
QUENCED FROM AN EXTERNAL
SOURCE.
~
LJ
modems and local terminals.
The power-sequence relays are part of the power sequence
network and are used in conjunction with the
EPO* /Power Sequence connector panel (shown in Figure
1-4) to sequence any subsystems attached to the
Processing Unit.
Figure 1-5 shows a map of the two logic chassis,
generalized by function.
*
EPO: Emergency Power Off
MU L Tl-SYSTEM EPO
USED WHEN TWO OR MORE SYSTEMS
REQUIRE EPO INTERLOCK.
D
D
1-6
D
[J
D
D
D
D
EIGHT EPO CONNECTORS
(POWER CONTROL)
"JUMPER" PLUGS MUST BE INSERTED
IN UNUSED JACKS TO ENSURE COM·
PLETION OF POWER-UP SEQUENCE.
Figure 1-4.
EPO/Power Sequenc:e Connector Panel
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