Jak działa INT 10, 13h z atrybutami?
Hey Im próbuję zrozumieć INT 10h, 13h (19), które zapisuje ciąg znaków z przerwaniem BIOS 10 z 13h w ah. Poniżej znalazłem informacje o różnych flagach, które należy umieścić w różnych rejestrach. Jedną rzeczą, której wciąż nie dostaję, jest to, co powinno być w BL, jeśli chcę po prostu napisać łańcuch za pomocą tej funkcji, co powinno być w BL jako atrybut? W tej chwili wypisuje dziwne migające symbole, które nie mają sensu. Z góry dziękuję
Writes a string of characters with specified attributes to any display
page.
On entry: AH 13h
AL Subservice (0-3)
BH Display page number
BL Attribute (Subservices 0 and 1)
CX Length of string
DH Row position where string is to be written
DL Column position where string is to be written
ES:BP Pointer to string to write
Returns: None
Notes: This service is available only for XTs dated 1/19/86
and later, ATs, EGAs, and PC Convertibles.
The service has four subservices, as follows:
AL=00h: Assign all characters the attribute in BL;
do not update cursor
AL=01h: Assign all characters the attribute in BL;
update cursor
AL=02h: Use attributes in string; do not update
cursor
AL=03h: Use attributes in string; update cursor
In Subservices 0 and 1, all characters in the string
are written to the screen with the same attribute--
the attribute specified in BL.
In Subservices 2 and 3, the attribute byte for each
character is found in the string itself. The string
itself consists of a character followed by its
attribute, another character followed by its
attribute, and so on. The string is copied directly
to the video buffer as is.
In Subservices 0 and 2, the cursor position is not
updated after the string is written.
In Subservices 1 and 3, the cursor is moved to the
first position following the last character in the
string.
Like Service 0Eh, Service 13h responds appropriately
to ASCII 07h (bell), 08h (backspace), 10h (line
feed), and 0Dh (carriage return). All other
characters are printed.