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Using the Viewmaster
Adjusting the Video Screen
Once the Viewmaster 80 is installed in your computer, the monitor
may need to be readjusted to provide the optimum 80 and 40 column
displays.
Although many of the adjustments and controls are different on the
various brands of monitors, they all basically do the same things.
Read the owner's manual that came with your monitor to find out
how to adjust the video display. If you're not sure what a particular
adjustment knob adjusts, experiment. Turn it slightly in one
direction. If it doesn't adjust what you want it to, return it to its
original position. Adjusting a monitor is similar to adjusting a
television set. But don’t just start twisting knobs!
Here’s basically what you need to do:
1.
Turn the computer on. Boot your system disk. You should be in
40 column mode.
2.
Perform the 40 column video adjustments (Brightness, Contrast,
Focus, Vertical, and Horizontal adjustments).
Adjust the brightness, contrast, and focus controls (if available)
so that the characters are legible and clear and the background is
dark. Too much brightness may cause the background "raster"
lines to appear. Too much contrast or brightness may cause fuzzy
characters. Too little contrast or brightness may result in dim
characters.
Use the horizontal controls to adjust the width of the display.
Then use the vertical controls to adjust the height of the display.
3.
While still in 40 column mode, enter the following video display
program:
10 PRINT CHR$(12)
20 FOR J = 32 TO 127
30 PRINT CHR$(J);
40 NEXT J
50 C = C + 1
60 IF C = 17 THEN END
70 GOTO 20
Ch. 2 - Using the ViewMaster 80
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