IBM 6400 Series - Page 46

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Principles of Operation
Expansion
Port
RS–232/422
IEEE–1284
(Parallel)
Fault
Sensors
Paper
Feed
Ribbon
Shuttle
Platen
Hammer
Drive
TTL
Diagnostic
Port
Control
Panel
RS–232
Diagnostic
Port
25 or 40 MHz
Figure 17. CMX Controller Board Block Diagram