CRT
CONTROL
1st.
REfRESH
ADJ)RESS
1
1
1
3rd.
REfRESH
ADDRESS
--+--+---}----}----:-
I 1 1 1 1
1 1 1 1 1
---}----}---
-:-
--
-:-
-
--:
1 1 1
1 1 I
--+--+--+
1 I
49th.
REfRESH
ADDRESS
1
1
1 1
--:---
-:--
--
1 1
1 1
1 1
-1---
-1----
1
1
-
-:----
1
___
:
____
:
50
x
25
GRAPHICS
1
:----
::
SCREEN
1201.st.
REfRESH
AJ)J)RESS
I
1 1
--+---}----:-
1 1 1
1 1 1
1 1 1
REfRESH
ADDRESS
RASTER
ADDRESS
N N + 1
0000
0
----
_L
-
-----
---
-
---
__
L -
----
---
----
___
L
----
1
------------------------------------------
1111
2
3
-----
---------------
----------
---
----
~
~~~E~~~~~~~~~~~~~~~~~~~~~~
~~~E~~~~
8
,
10
11
12
13
14
15
::~E:::::~::::::~:::::::::
--------------------------------
::-~:::::-::::::-:::::::::
:::~::::
--------------------------------
-----r---------------r----------
Figure 3. Graphics Screen
125O'th.
REFRESH
AJlJlRESS
1
CHARACTER
ROW
(16
SCAN
LINES)