NOTES ON VIDEO TESTS

Roy Stedman : 08APR92
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The system should be started with a STe color monitor or VGA
monitor plugged in. 

Both monitors will work for most tests. Starting with a STe monitor is 
required for the 'M' video modes test. The STe monitor will be slightly
more compatible and should be used if a choice is available.

The VGA monitor is recommended for a test station running the 'V' tests.
after running the 'V' tests, the submenu background will be black to
signify a VGA monitor. Returning to the main menu will restore the
screen background color.

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Video Test Menu, option C - Color test

	This is the same as the old STe Color test,
it can be viewed on the monitor the system was started with,
color or VGA.

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Video Test Menu, option M - Monitors test

	This tests the Videl, the TV modulator, and the
other video output circuitry. This test should be run
with a RS232 terminal attached so all messages will be
shown to the tester. 
	The test starts with the color monitor attached,
shows the screen from option 1 (below). Then the tester
should connect a TV monitor to the modulator connector and
verify proper output. 
	The tester then connects a monochrome monitor and
presses SPACE to advance to the monochrome test (option 3, below) 
After verifying monochrome output, the tester then connects
a VGA monitor and again presses SPACE. After checking (option 4, below)
the VGA output, the tester connectes the color monitor again and
presses SPACE to return to the video test menu.

note: if the tester presses ESC instead of SPACE, the rest of 
the test will be skipped and the video test menu will return
after a color monitor is connected.

each test may be run independantly by using the numbered tests.

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Video Test Menu, option V - VGA Modes test

	This test tests more of the Videl circuits by displaying
several different video modes on a VGA monitor. Again, a RS232
terminal should be connected in order to recieve the test prompts

	The first screen is the same as option 4, below. The
second screen tests 320 x 480 XGA. 

NOTE: The second screen does not work on rev. 1 combels and should
be skipped by pressing 'B' instead of space after the first screen. 
The system will most likely crash otherwise.

	The third screen tests 640 x 200 STe modes and shows the
video test menu screen while changing the background colors. There
should be four of each color, in order: dim, bright, less, less..
if there are not, there are problems with the STe palette.

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Video Test Menu, option 1 - Color

Screen: 640 x 200 XGA
	A set of R,G,B color bars on the left half,
and a rainbow of colors in a block on the right half.
System is ok if all colors are in the bars, and the
rainbow colors are the same as a good system.

note that the color bars are each one DAC bit. If one
is missing, check connections to the DAC. 

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Video Test Menu, option 2 - TV 

Screen: 640 x 200 XGA
	same as above, viewed on the TV monitor

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Video Test Menu, option 3 - Mono

Screen: 640 x 400, monochrome
	A black screen with white blocks,
alternating to a white screen with black blocks
(same as old STe Hires test)

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Video Test Menu, option 4 - VGA

Screen: 640 x 480, 256 Colors
	A black screen with crossed white lines,
(vertical and horizontal centered, diagonal shifted left)
a set of color bars on the right, just left of the
color bars, a white block with black lines through it,
and the contents of the Sparrow palette in a 16x16 square on the left

The system is ok if the screen is stable, the color bars are of
increasing intensity for each color, and in the order G,B,R from top down.

The system has a problem if the colors are in the wrong
order, are mixed, or if the lines or blocks are not
steady and clear.

note that the color bars are each one DAC bit. If one
is missing, check connections to the DAC. 

NOTE: A rev. 1 combel will show mixed and out of order color bars.

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