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4. t
INTRODUCTION
CHAPTER 4
SYSTEM MODULE TECHNICAL DESCRIPTION
This chapter provides a technical description of the Rainbow 100 system module for repair or maintenance
personnel. The system module is described both to the block diagram level and the functional block
diagram level. The logic circuits are generally not described to the detailed circuit level except in those
cases where such description is considered necessary for a clear understanding of the subject matter.
4. t. t
Chapter Organization
The information in this chapter is divided into four sections:
•
A general description of the functions performed by the system module (Paragraph 4.2)
•
A physical description of the system module (Paragraph 4.3)
•
A functional description of the system module (Paragraph 4.4)
•
A description of the system module connectors (Paragraph 4.5)
4. t.2
Related Documentation
In some of the block diagrams within this chapter, the logic blocks contain the word SHEET followed by a
number. This refers to a sheet number of the system module circuit schematics. These numbers may be
used while reading this chapter to locate the detailed circuit logic represented by the function logic blocks.
The PC 1 00 system module circuit schematics (D-CS-5415486-0-1) consist of 13 sheets and are a part of
the PC 1 00 Field Maintenance Print Set (MP-O 1491-00).
4.2
GENERAL DESCRIPTION
The system module has a dual-processor architecture that uses an 8088 16-bit processor coupled with a
Z80A 8-bit processor. Figure 4-1 is a block diagram that shows the relationship between the processors
and their supporting logic. The processors operate from and transfer data through a shared block of 62K
bytes of RAM to direct, control, and monitor the system's functions. Each processor has, in addition to the
shared block of memory, 2K bytes of private RAM and peripheral circuitry.
Each processor supports a portion of the system's function in addition to running 8-bit or 16-bit applica-
tion/user software. The 8088 processor controls the monitor, keyboard, communications connector, and
all options added to the system. The 8088 communicates with its supporting logic and installed options via
a 20-bit unidirectional address bus and an 8-bit bidirectional data bus.
The Z80A processor transfers address/data and control signals to the RX50 controller, which uses these
signals to read data from and write data to the dual-diskette drives. The Z80A communicates with its
supporting logic and the RX50 controller via a 16-bit unidirectional address bus and an 8-bit bidirectional
data bus.
4-1
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