Vector 4 - Page 140

09-01-82
VECTOUR 4
TECHNICAL INFORMATION
To measure and inspect the screen to make sure all the video adjustments
are correct, it will be necessary to fill the screen with one of three
characters. The following chart gives the characters used for the four
primary video adjustments:
Yideo ASCII
Adjustment Chargcter
V. Linearity "E"
H. Linearity "H"
Contrast/Focus ngn
Refer to Section III 4.2, Screen Test, for information on filling screen
with desired characters. Here is an alternate method.
To fill the screen, boot the Vector 4 and load the BASIC interpreter
(enter the command MBASIC5 [RETURN]). Enter the following program:
10 INPUT E$
20 FOR I=1 TO 24
30 FOR J=1 TO 79
40 PRINT ES;
50 NEXT J
60 PRINT
70 NEXT 1
80 END
To keep this program on your adjustment diskette, enter the command
SAVE "VIDEO",A [RETURN]. This will allow you to use the program on
other systems without a MONITOR program,
To run the program, enter the command RUN [RETURN] when the screen
gives the Ok prompt. At the ?, enter the letter indicated in Exhibit III
2-3 for the test you are performing.
Fill the screen with the letter "E" and measure the length and height of
the data field. The length should be 9 inches and the height between 6
and 6 1/2 inches. If your data field is smaller or bigger (off the screen)
or is not linear, then perform Steps 5 through 9, beginning this page. It
may be necessary to go through steps 5 to 9 several times (using
different orders) until the proper "adjustment relationship” can be
achieved.
Normal fi
EEEEEE.EEEE
6, 6-1/2 EEEEEE.EEEE
inches«<—+ EEEEEE.EEEE
EEEEEE.EEEE [, (g
EEEEEE.EEEE CRT
'EEEEEE.EEEE
9 infhes
:
7200-0001 I 2-3