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Bitfields for status register information

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Bit Description

0

 display enable
0 - display enabled
1 - vertical or horizontal retrace in progress

1

 light pen flip flop set

2

 light pen switch activated

3

 vertical sync

4

 monitor resolution
0 - high resolution (>200 lines)
1 - low resolution (<=200 lines)

5

 display type
0 - color
1 - monochrome

6, 7

 diagnostic bits

Note:

bits 0-3 are the same as the EGA/VGA status register bits 0-3