Data Flow - IBM 5251 11 Maintenance Information Manual

DATA FLOW
The next figure shows the data flow of the display
station. The following pages of this section describe
functions in each of the major sections of the display
station.
All the electronic logic of this display station is
contained on a main planar board.
Keyboard
o
Status Switch
Planar 1-------
I
I
Keyboard
Adapter
-------,
I
Read-Only
I
Storage
I
I
,
Keylock
Feature
Keylock
Adapter
Feature
I
&-0 ___
--1
Microprocessing
I
Unit ,
To
Controller·--~~
Cable
Adapter
ReadIWrite
Storage
Display
Adapter
I
0-
0 Line Check
o~
Line Sync
e
0 Internal Check
e-
0
Storage Check
4)
0
Ready
Brightness
Contrast
I
L_ ____________ J
To Next
(~
Terminal --~---y--
Cable Thru
Feature
lID
4
2
T
Address Switches
r------~
Power
Supply
Horizontal, Vertical,
and Video Signals
Power
Switch
Theory 5251 MIM 4-3