meep-eep
e7eabd46b9
git-svn-id: svn://svn.code.sf.net/p/sc2/code/trunk@1545 8092fc87-c524-0410-9efc-e669fe64eaf9
43 lines
1.2 KiB
PHP
43 lines
1.2 KiB
PHP
;---------------------------------------------------------------------------
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; ega.mac
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; This header file defines subroutines to do ega graphics from assembler.
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;-----------------------------------------------------------------
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; EGA register equates
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TS_INDEX equ 3c4h ; Time Sequencer Index
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TS_MASK equ 2 ; -- Map Mask (Enables CPU writes)
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GDC_INDEX equ 3ceh ; Graphics Data Controller Index
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GDC_MODE equ 5 ; -- Mode Register
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GDC_RSEL equ 4 ; -- Read Map Select
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CRTC_INDEX equ 3d4h ; CRT Controller Index
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CRTC_OFFSET equ 13h ; -- Offset Register
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CRTC_STARTH equ 0ch ; -- High Byte of Start Address
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CRTC_STARTL equ 0dh ; -- Low Byte of Start Adrress
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STATUS_REGISTER equ 3dah ; EGA status register
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VSYNC_MASK equ 08h ; -- Vertical synch bit in status register
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;-------------------------------------------------------------------------
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; SETREG macro to set internal register <reg> of chip with
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; index register at <index> to the value stored in AL
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;-----------------------------------------------------------------
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; push dx
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; mov dx,P1
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; mov ah,al
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; mov al,P2
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; out dx,ax
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; pop dx
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SETREG macro P1, P2
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push dx
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mov dx,P1
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mov ah,al
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mov al,P2
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out dx,al
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mov al,ah
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inc dx
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out dx,al
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pop dx
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endm
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