Compatibility: EGA VGA

Expects: AX    1003H

BL    00H = enable bold backgrounds (16 background colors)

01H = enable blinking foreground (8 background colors)

Returns: (none)

Info: This enables or disables blinking foreground colors in EGA/VGA

text modes.  By default, the BIOS enables blinking foregrounds

(characters blink when bit 7 of the Video Attribute is set).

When foreground blink is disabled (BL=00H), all 16 colors are

available for use as background colors.

Notes: This fn is not available on CGAs  and MDAs .  To use this

attractive and often-seen effect, you must program the CGA Mode

Select Register, manually clearing bit 5.  See CGA I/O Ports.

For instance:

mov ax,40H

mov es,ax

mov dx,es:[063H]  ;get port address of the card

add dx,4

mov al,es:[065H]  ;get current value of Mode Select Register

and al,0dfH       ;mask value by 1101 1111 (to clear bit 5)

out dx,al         ;disable blink (set for bold background)

mov es:[065H],al  ;save the new setting

See Also: INT 10H 10H: EGA/VGA Palette Functions

INT 10H: Video Services

EGA/VGA Data Areas

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