ZiLOG System 8000 Hardware Reference Manual

HRM
Zilog HRM
The basic system contains five or six printed circuit boards
in the ten-slot card cage. These boards (Figures 1-2
through 1-8) are:
the CPU
the Winchester Disk Controller (WDC)
or Storage Module Device Controller Boards A and B
the Cartridge Tape Controller
and the Memory Subsystem
including ~he ECC Controller
and one or more Memory Arrays.
The lower three slots of the card cage are normally dedi-
cated to the memory sUbsystem; with the addition of more
memory boards, the basic system can have a physical memory
of 2 megabytes, not including the small bootstrap memory on
the CPU board. An optional memory configuration uses the
lower five slots of the card cage for a maximum physical
memory of 4 megabytes.
An expansion chassis module will be available that can be
added to the system increasing the number of cards attached
to the bus from 10 to 18. This allows still more options.
1.2. Functional Relationships
The diagram in Figure 1-9 shows the functional relationships
of the boards that make up the basic system. These elements
communicate with one a~other over Zilog's Z-Bus Backplane
Interconnect (ZBI), a high-speed, 32-bit, semisynchronous
bus. The following paragraphs briefly describe the func-
tions of each element on the bus.
1.2.1. CPU Board (CPU): The CPU is the host of the System
8000; it controls the ZBI and terminal communications into
and out of the system. The CPU supports eight serial I/O
ports and a parallel I/O port (Figure 1-9). The serial
ports are compatible with RS232-C. The parallel port, with
the appropriate jumpers inserted, is compatible with the
line printer standards of either Centronics or Data Pro-
ducts.
1-2
Zilog
1-2

ZiLOG System 8000 Specifications

General

Brand	ZiLOG
Model	System 8000
Category	Desktop
Language	English