INT 10 - VIDEO - TEXT-MODE CHARGEN - SET BLOCK SPECIFIER (PSIBM PS/2, any model,EGAEnhanced Graphics Adapter(Enhanced Graphics Adapter) IBMInternational Busiuness Machines's second color video board for the IBMInternational Busiuness Machines PCIBM PC family, capable of a maximum resolution of 640x350 pixels in 16 simultaneous colors of a total of 64 possible colors.,VGAVideo Graphics Array(Video Graphics Array) The video adapter introduced with the IBMInternational Busiuness Machines PS/2IBM PS/2, any model series of computers.)
	AX = 1103h
	BL = block specifier (see #00020)
Return: nothing
Notes:	(see also AX=1110h)
	This function allows dual character sets to appear on screen
	  simultaneously
SeeAlso: AX=1100h,AX=1101h,AX=1102h,AX=1104h,AH=1Bh,AX=CD10h
SeeAlso: MEM 0040h:0084h
Index:	text mode;font|text mode;screen rows


Bitfields for block specifier:
Bit(s)	Description	(Table 00020)
---EGA/MCGA---
 0,1	block selected by characters with attribute bit 3 clear
 2,3	block selected by characters with attribute bit 3 set
---VGA---
 0,1,4	block selected by characters with attribute bit 3 clear
 2,3,5	block selected by characters with attribute bit 3 set