Control Power Input [+] - Husky MP2500 Manual

Description

Control power input [+]

Entry
Exit
250
If you set AL to 0, this function will read the attribute
table into the 256 byte buffer pointed to by DS:SI. If you
set AL to non-zero, the attribute table will be set to the
contents of this buffer.
The first entry in the table is for text attribute 00H, the
second for text attribute 01H and so on. Whenever a
character is displayed, its character dot data is XORed
with the appropriate entry in the table and the result is
displayed.
For example, if a character has the attribute 01H and
entry 01H in the table is 00H, the character will be
displayed as normal; if the entry is FFH, the character
will be displayed as inverse video.
The dot data is XORed a row at a time, with the least
significant bits of the entry. For example, if the entry is
0FH (00001111), the righthand four pixels of the
character will be reversed. In 8x8 mode, the righthand
half will be reversed, while in 8x6 mode the righthand
two thirds will be reversed.
Users can also
combination to display as reversed, by using the HOT
key. This will override changes made by using this
function, but you can prevent access by using INT 15
function 7BH.
Note that this function has no effect in graphics modes,
since there are no text attributes in graphics modes.
AH=8AH
AL=0 (disable) or non 0 (enable)
SI=1234H (password)
DI=5678H (password)
AH=00H (success) or 0FFH (failure)
select the particular
H MP2500 System Developer's Guide
USKY
attribute