Wang 5536 - Chapter 2 Theory of Operation; Functional Overview

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2.1 FUNCTIONAL OVERVIEW
CHAPTER 2
THEORY OF OPERATION
3402
Workstation logic resides on two circuit boards, PCA 210-7545 and PCA
210-7744 (figure 2-1). The major logic functions for each board are:
210··7545-2 PCA
o Instruction/Bus control(CPU)
o Video Display Logic
o CRT M1~mory
o Keyboard Logic
210-7744 PCA (Models A, lA, 2A and 3A depending on memory size)
o Main Memory
o Data Link
These functions are interconnected by the System Address Bus and the System
Data Bus .
If the workstation contains the TC option, a third PCA -- 210-7541-- will
be located in slot number 3 of the motherboard. See section 2.4 for more
information on the TC option.
ZBOA
CPU
TIMING
15 9 4
4MHz
PARITY
GENtCHK
IEVENI
KEYBOARO
INTERFACE C
1
I
KEYBOARD
ADDRESS BUS AO • A 15
BEEP
CLICK
TO
CR1
DATA 00·07
OUT
DECODE
MEMORY
CONFIG
IDIPSW I
~ \,.
r ...;:w:'.. l
I I
I ~1
1
~.~~~~~ I
I ~:~·~ I
I
.. ~ ..
I I
I I
I
""' ?
MAIN
MEMORY
48K
OR
•••
OMA ·
CONTROL
Figure 2-1. Workstation Block Diagram
2-1
DATA
LINK
,....., J60
K BYTE
4MBPS
ITO MASTER!