Redirect Serial Number [+]; Set Backlight (Option) Power Up State [+] - Husky MP2500 Manual

Redirect serial number [+]

Entry
Exit
Description
Note:

Set backlight (option) power up state [+]

Entry
Exit
Description
Chapter 26: INT 15H, BIOS Extension Functions [+]
AH=72H
AL=0 (reset) or non-0 (set)
DS=segment address of serial number
BX=segment offset of serial number
AH=0 (success)
By default, each MP2500 has the same 6-digit serial
number stored in ROM, but serial numbers can be
stored in the RAM. These can then be used to identify
the unit which a program is running on (eg for copy-
protection purposes). These serial numbers are read
by using function 6CH.
Use this function to change the serial number read
routine so that it returns the serial number stored in the
RAM, or reset it to read the standard serial number.
Store the serial number as six consecutive bytes, with
each byte specifying a decimal digit in ASCII (ie in the
range 30H (0) to 39H (9)).
More usefully, the unit's actual serial number can be
read by using function 99H (get unit serial number).
The default, restored by a cold start, is to use the ROM
serial number, which is identical on all units.
AH=74H AL=mode (1=off, 2=same level, 3=on)
AH=status
If the backlight option is fitted, use this function to
specify how the backlight should be set when MP2500
is next turned on.
The default level, restored by a cold start, is 0.
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