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Chapter 3
Controller PCB
The Controller PCB (G9PFCU) is the same size and has the same general physical
arrangement as the Processor PCB. Like the Processor PCB, it fits into the Mother
Board with a 100-pin card-edge socket. It is normally located in the first slot
position (closest to the CRT).
Installed on the Controller PCB are five cable connectors: a communications
interface connector, a CRT interface connector, an FDD interface connector, a
speaker interface connector, and a volume interface connector (see Figure 3-1).
Figure 3-2 shows the functional relationships between the five principal compo-
nents that occupy the Controller PCB.
• CRT Display control for the 12.;.inch monochrome or color display --
designed around the
~PD7220
graphic display controller
• An 8-inch FDD control, that can read from and drive double-sided double-
density flexible disks or single-sided single-density disks
• Serial 110 device control, supported by the NEC 8251A controller, converts
serial data to parallel data and parallel data to serial data -- it can do so
synchronously or asynchronously, using half- or full-duplex at various
baud rates
• Sound control is supported by Large-Scale Integration (LSI) NEC
~PD
1771-006 and generates signal beeps and programmed melodies
• Arithmetic processing unit, an optional device, that provides high perform-
ance fixed-and-floating-point arithmetic operations and floating-point tri-
gonometric operations.
3.1
MOTHER BOARD/CARD CAGE INTERFACE
For a description of this interface, see Section 2.1.
3-1
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