Retro video games delivered to your door every month!
Click above to get retro games delivered to your door ever month!
X-Hacker.org- Interrupts & Ports - Norton Guide http://www.X-Hacker.org [<<Previous Entry] [^^Up^^] [Next Entry>>] [Menu] [About The Guide] 

        014 - Equipment Byte

        The equipment byte defines the basic equipment in the system for
        the power-on diagnostic tests.

          11xx xxxx  Number of diskette drives
                       These bits indicate the mumber of diskette drives
                       installed.
                       00 = One Drive
                       01 = Two Drives
                       10 = Reserved
                       11 = Reserved
          xx11 xxxx  Display Operating Mode
                       These bits indicate the operating mode of the display
                       attached to the video port, as shown in the following
                       figure.
                       00 = Reserved
                       01 = 40-Column Color Mode
                       10 = 80-Column Color Mode
                       11 = 80-Column Monochrome Mode
          xxxx 11xx  Reserved
          xxxx xx1x  Math Coprocessor Presence
                       When set to 1, this bit indicates that a math co-
                       processor (80x87) is installed.
          xxxx xxx1  Diskette Drive Presence
                       When set to 1, this bit indicates that a diskette
                       drive is installed.
Online resources provided by: http://www.X-Hacker.org --- NG 2 HTML conversion by Dave Pearson