Function 1Bh    Functionality/State Information              (MCGA, VGA) 

entry   AH      1Bh 

	BX      implementation type 

		0000h return funtionality/state information 

	ES:DI   pointer to 64 byte buffer 

return  AL      1Bh if function supported 

	ES:DI   buffer filled 

		00h     address of functionality table 

		01h     unknown 

		02h     unknown 

		03h     unknown 

		04h     current video mode 

		05h     number of columns 

		06h     unknown 

		07h     length of regen buffer in bytes 

		09h     starting address of regen buffer 

		0Bh     cursor position for page 0 

		0Dh     cursor position for page 1 

		0Fh     cursor position for page 2 

		11h     cursor position for page 3 

		13h     cursor position for page 4 

		15h     cursor position for page 5 

		17h     cursor position for page 6 

		19h     cursor position for page 7 

		1Bh     cursor type 

		1Dh     active display page 

		1Eh     CRTC port address 

		20h     current setting of register (3?8) 

		21h     current setting of register (3?9) 

		22h     number of rows 

		23h     bytes/character 

		25h     DCC of active display 

		26h     DCC of alternate display 

		27h     number of colors supported in current mode 

		29h     number of pages supported in current mode 

		2Ah     number of scan lines active 

			(0,1,2,3) = (200,350,400,480) 

		2Bh     primary character block 

		2Ch     secondary character block 

		2Dh     miscellaneous flags byte 

			bit 0 all modes on all displays on 

			    1 gray summing on 

			    2 monochrome display attached 

			    3 default palette loading disabled 

			    4 cursor emulation enabled 

			    5 0=intensity; 1=blinking 

			    6 reserved 

			    7 reserved 

		2Eh to 30h reserved 

		31h     video memory available 

			00h=64K, 01h=128K, 02h=192K, 03h=256K 

		32h     save pointer state flags byte 

			bit 0 512 character set active 

			    1 dynamic save area present 

			    2 alphanumeric font override active 

			    3 graphics font override active 

			    4 palette override active 

			    5 DCC override active 

			    6 reserved 

			    7 reserved 

		33h to 3Fh  reserved 


note    State Functionality Table format (16 bytes) 

	00h     modes supported #1 

		bit 0 to bit 7 = 1 modes 0,1,2,3,4,5,6 supported 

	01h     modes supported #2 

		bit 0 to bit 7 = 1 modes 8,9,A,B,C,D,E,F supported 

	02h     modes supported #3 

		bit 0 to bit 3 = 1 modes 10,11,12,13 supported 

		bit 4 to bit 7 reserved 

	03h to 06h reserved 

	07h     scan lines supported 

		bit 0 to bit 2 = 1 if scan lines 200,350,400 supported 

	08h     total number of character blocks available in text modes 

	09h     maximum number of active character blocks in text modes 

	0Ah     miscellaneous function flags #1 

		bit 0 all modes on all displays function supported 

		    1 gray summing function supported 

		    2 character font loading function supported 

		    3 default palette loading enable/disable supported 

		    4 cursor emulation function supported 

		    5 EGA palette present 

		    6 color palette present 

		    7 color paging function supported 

	0Bh     miscellaneous function flags #2 

		bit 0 light pen supported 

		    1 save/restore state function 1Ch supported 

		    2 intensity blinking function supported 

		    3 Display Combination Code supported 

		    4-7 reserved 

	0Ch to 0Dh reserved 

	0Eh     Save pointer function flags 

		bit 0 512 character set supported 

		    1 dynamic save area supported 

		    2 text font override supported 

		    3 graphics font override supported 

		    4 palette override supported 

		    5 DCC extension supported 

		    6 reserved 

		    7 reserved 

	0Fh     reserved 

 

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