AT&T 6300 Service Manual page 236

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1 - MEMORY TEST: No error should occur during this test. If

any error does occur, reject the DEB.

The "Diagnostic Utility" will write data to the

default drive. MFD default drives must have a formatted

(write unprotected) diskette installed.

2 - OPTION BOARD TRANSPARENT MODE: This test

displays a framed full screen with three lines. If any additional

random character and/or blocks are displayed, rej ect the board.

3 - TEXT WITH 400-LINE GRAPHICS: This test produces a

screen with 8 lines, each exercising a different video feature. The

monitor contrast control must be set to midrange. Each line

describes its appearance. If the description and the actual

appearance do not agree, reject the board.

4 - TEXT WITH 200-LINE GRAPHICS: This test is similar to

the 400-line graphics test and displays the same self-explanatory

messages. The monitor contrast control must be set to midrange.

5 - 400-LINE GRAPHICS, 4-BIT PLANES, FULL LUT:

This test verifies the proper performance of several screen

capabilities. Several lines containing self-explanatory messages

are displayed on the screen, each testing a different feature.

6 - REDUCED LUT TEST (LITTLEBIT): Three self

explanatory messages are displayed for this test.

Approval of the question asked on the screen redisplays the main

screen options. Selection "0" then summarizes the results on the

screen in a set of messages.