INT 0x10 - 0x13 - Write String (BIOS versions from 1/10/86)

Request/Call:

reg	value	descr
AH	0x13
AL		write mode (see bit settings below)
BH		Video Page number
BL		attribute if mode 0 or 1 (AL bit 1 = 0)
CX		length of string (ignoring attributes)
DH		row coordinate
DL		column coordinate
ES:BP		pointer to string

AL Write Mode:

0	string is chars only, attribute in BL, cursor not moved
1	string is chard only, attribute in BL, cursor moved
2	string contains chars and attributes, cursor not moved
3	string contains chars and attributes, cursor moved

Nothing

Cursor advances after write
characters BEL (0x07), BS (0x08), LF (0x0A), and CR (0x0D) are treated as control codes
for some older BIOS (10/19/81), the BH register must point to the currently displayed page
on CGA adapters this function can disable the video signal while performing the output which causes flitter.