LABEL X320Y200 word db 00 ; 0e3h ; dot clock db 02 ; Number of CRTC Registers to update dw 00014h ; turn off dword mode dw 0e317h ; turn on byte mode dw 320 ; width dw 200 ; height LABEL X320Y200s word db 0e3h ; dot clock db 02 ; Number of CRTC Registers to update dw 00014h ; turn off dword mode dw 0e317h ; turn on byte mode dw 320 ; width dw 200 ; height LABEL X320Y240 word db 0e3h ; dot clock db 10 ; Number of CRTC Registers to update dw 00d06h ; vertical total dw 03e07h ; overflow (bit 8 of vertical counts) dw 04109h ; cell height (2 to double-scan) dw 0ea10h ; v sync start dw 0ac11h ; v sync end and protect cr0-cr7 dw 0df12h ; vertical displayed dw 00014h ; turn off dword mode dw 0e715h ; v blank start dw 00616h ; v blank end dw 0e317h ; turn on byte mode dw 320 ; width dw 240 ; height LABEL X360Y200 word db 0e7h ; dot clock db 08 ; Number of CRTC Registers to update dw 06b00h ; horz total dw 05901h ; horz displayed dw 05a02h ; start horz blanking dw 08e03h ; end horz blanking dw 05e04h ; start h sync dw 08a05h ; end h sync dw 00014h ; turn off dword mode dw 0e317h ; turn on byte mode dw 360 ; width dw 200 ; height LABEL X360Y240 word db 0e7h ; dot clock db 16 ; Number of CRTC Registers to update dw 06b00h ; horz total dw 05901h ; horz displayed dw 05a02h ; start horz blanking dw 08e03h ; end horz blanking dw 05e04h ; start h sync dw 08a05h ; end h sync dw 00d06h ; vertical total dw 03e07h ; overflow (bit 8 of vertical counts) dw 04109h ; cell height (2 to double-scan) dw 0ea10h ; v sync start dw 0ac11h ; v sync end and protect cr0-cr7 dw 0df12h ; vertical displayed dw 00014h ; turn off dword mode dw 0e715h ; v blank start dw 00616h ; v blank end dw 0e317h ; turn on byte mode dw 360 dw 240 LABEL X376Y282 word db 0e7h db 18 dw 06e00h ; horz total dw 05d01h ; horz displayed dw 05e02h ; start horz blanking dw 09103h ; end horz blanking dw 06204h ; start h sync dw 08f05h ; end h sync dw 06206h ; vertical total dw 0f007h ; overflow dw 06109h ; cell height dw 0310fh ; dw 03710h ; v sync start dw 08911h ; v sync end and protect cr0-cr7 dw 03312h ; vertical displayed dw 02f13h ; offset dw 00014h ; turn off dword mode dw 03c15h ; v blank start dw 05c16h ; v blank end dw 0e317h ; turn on byte mode dw 376 dw 564 LABEL X320Y400 word db 00 ;0e3h ; dot clock db 03 ; Number of CRTC Registers to update dw 04009h ; cell height dw 00014h ; turn off dword mode dw 0e317h ; turn on byte mode dw 320 ; width dw 400 ; height LABEL X320Y480 word db 0e3h ; dotclock db 10 ; Number of CRTC Registers to update dw 00d06h ; vertical total dw 03e07h ; overflow (bit 8 of vertical counts) dw 04009h ; cell height (2 to double-scan) dw 0ea10h ; v sync start dw 0ac11h ; v sync end and protect cr0-cr7 dw 0df12h ; vertical displayed dw 00014h ; turn off dword mode dw 0e715h ; v blank start dw 00616h ; v blank end dw 0e317h ; turn on byte mode dw 320 ; width dw 480 ; height LABEL X360Y400 word db 0e7h ; dot clock db 09 ; Number of CRTC Registers to update dw 06b00h ; horz total dw 05901h ; horz displayed dw 05a02h ; start horz blanking dw 08e03h ; end horz blanking dw 05e04h ; start h sync dw 08a05h ; end h sync dw 04009h ; cell height dw 00014h ; turn off dword mode dw 0e317h ; turn on byte mode dw 360 ; width dw 400 ; height LABEL X360Y480 word db 0e7h db 17 dw 06b00h ; horz total dw 05901h ; horz displayed dw 05a02h ; start horz blanking dw 08e03h ; end horz blanking dw 05e04h ; start h sync dw 08a05h ; end h sync dw 00d06h ; vertical total dw 03e07h ; overflow dw 04009h ; cell height dw 0ea10h ; v sync start dw 0ac11h ; v sync end and protect cr0-cr7 dw 0df12h ; vertical displayed dw 02d13h ; offset dw 00014h ; turn off dword mode dw 0e715h ; v blank start dw 00616h ; v blank end dw 0e317h ; turn on byte mode dw 360 dw 480 LABEL X360Y360 word db 0e7h db 15 dw 06b00h ; horz total dw 05901h ; horz displayed dw 05a02h ; start horz blanking dw 08e03h ; end horz blanking dw 05e04h ; start h sync dw 08a05h ; end h sync dw 04009h ; cell height dw 08810h ; v sync start dw 08511h ; v sync end and protect cr0-cr7 dw 06712h ; vertical displayed dw 02d13h ; offset dw 00014h ; turn off dword mode dw 06d15h ; v blank start dw 0ba16h ; v blank end dw 0e317h ; turn on byte mode dw 360 dw 360 LABEL X376Y308 word db 0e7h db 18 dw 06e00h ; horz total dw 05d01h ; horz displayed dw 05e02h ; start horz blanking dw 09103h ; end horz blanking dw 06204h ; start h sync dw 08f05h ; end h sync dw 06206h ; vertical total dw 00f07h ; overflow dw 04009h ; dw 0310fh ; dw 03710h ; v sync start dw 08911h ; v sync end and protect cr0-cr7 dw 03312h ; vertical displayed dw 02f13h ; offset dw 00014h ; turn off dword mode dw 03c15h ; v blank start dw 05c16h ; v blank end dw 0e317h ; turn on byte mode dw 376 dw 308 LABEL X376Y564 word db 0e7h db 18 dw 06e00h ; horz total dw 05d01h ; horz displayed dw 05e02h ; start horz blanking dw 09103h ; end horz blanking dw 06204h ; start h sync dw 08f05h ; end h sync dw 06206h ; vertical total dw 0f007h ; overflow dw 06009h ; dw 0310fh ; dw 03710h ; v sync start dw 08911h ; v sync end and protect cr0-cr7 dw 03312h ; vertical displayed dw 02f13h ; offset dw 00014h ; turn off dword mode dw 03c15h ; v blank start dw 05c16h ; v blank end dw 0e317h ; turn on byte mode dw 376 dw 564 LABEL X256Y240 word db 0e3h ; dot clock db 16 ; Number of CRTC Registers to update dw 05f00h ; horz total dw 03f01h ; horz displayed dw 04002h ;04202h ; start horz blanking dw 0a003h ;09f03h ; end horz blanking dw 04f04h ; start h sync dw 00405h ; end h sync dw 00d06h ; vertical total dw 03e07h ; overflow (bit 8 of vertical counts) dw 04109h ; cell height (2 to double-scan) dw 0ea10h ; v sync start dw 0ac11h ; v sync end and protect cr0-cr7 dw 0df12h ; vertical displayed dw 0e715h ; v blank start dw 00616h ; v blank end dw 00014h ; turn off dword mode dw 0e317h ; turn on byte mode dw 256 dw 240 LABEL X256Y70 word db 0e3h ; dot clock db 16 ; Number of CRTC Registers to update dw 05f00h ; horz total dw 03f01h ; horz displayed dw 04002h ;04202h ; start horz blanking dw 0a003h ;09f03h ; end horz blanking dw 04f04h ; start h sync dw 00405h ; end h sync dw 00d06h ; vertical total dw 03e07h ; overflow (bit 8 of vertical counts) dw 04709h ; cell height (8 to get blocky) dw 0ea10h ; v sync start dw 0ac11h ; v sync end and protect cr0-cr7 dw 0df12h ; vertical displayed dw 0e715h ; v blank start dw 00616h ; v blank end dw 00014h ; turn off dword mode dw 0e317h ; turn on byte mode dw 256 dw 240 LABEL X256Y154 word db 0e3h ; dot clock db 18 ; Number of CRTC Registers to update dw 05f00h ; horz total dw 03f01h ; horz displayed dw 04002h ;04202h ; start horz blanking dw 0a003h ;09f03h ; end horz blanking dw 04f04h ; start h sync dw 00405h ; end h sync dw 06206h ; vertical total dw 00f07h ; overflow dw 04109h ; CELL HEIGHT dw 0310fh ; dw 03710h ; v sync start dw 08911h ; v sync end and protect cr0-cr7 dw 03312h ; vertical displayed dw 02f13h ; offset dw 00014h ; turn off dword mode dw 03c15h ; v blank start dw 05c16h ; v blank end dw 0e317h ; turn on byte mode dw 256 dw 308 LABEL X256Y282 word db 0e3h ; dot clock db 18 ; Number of CRTC Registers to update dw 05f00h ; horz total dw 03f01h ; horz displayed dw 04002h ;04202h ; start horz blanking dw 0a003h ;09f03h ; end horz blanking dw 04f04h ; start h sync dw 00405h ; end h sync dw 06206h ; vertical total dw 0f007h ; overflow dw 06109h ; cell height dw 0310fh ; dw 03710h ; v sync start dw 08911h ; v sync end and protect cr0-cr7 dw 03312h ; vertical displayed dw 02f13h ; offset dw 00014h ; turn off dword mode dw 03c15h ; v blank start dw 05c16h ; v blank end dw 0e317h ; turn on byte mode dw 256 dw 564 LABEL X256Y200 word db 0e3h ; dot clock db 8 ; Number of CRTC Registers to update dw 05f00h ; horz total dw 03f01h ; horz displayed dw 04002h ; start horz blanking dw 0a003h ; end horz blanking dw 04f04h ; start h sync dw 00405h ; end h sync dw 00014h ; turn off dword mode dw 0e317h ; turn on byte mode dw 256 dw 200 LAST_X_MODE = 17 LABEL ModeTable word ; Mode X tweak table dw offset X320Y200 dw offset X320Y240 dw offset X360Y200 dw offset X360Y240 dw offset X376Y282 dw offset X320Y400 dw offset X320Y480 dw offset X360Y400 dw offset X360Y480 dw offset X360Y360 dw offset X376Y308 dw offset X376Y564 dw offset X256Y240 dw offset x256y200 dw offset X320Y200s dw offset x256y154 dw offset x256y282 dw offset x256y70 M320x200x256 =0 ;constants for easy calling M320x240x256 =1 M360x200x256 =2 M360x240x256 =3 M376x282x256 =4 M320x400x256 =5 M320x480x256 =6 M360x400x256 =7 M360x480x256 =8 M360x360x256 =9 M376x308x256 =10 M376x564x256 =11 M256x240x256 =12 ;GREAT modes - ypos is upper byte, xpos is lower M256x200x256 =13 M320x200x256s=14 M256x154x256 =15 M256x282x256 =16 M256x70x256 =17 InputStatus1= 3dah MISC_OUTPUT = 3c2h SC_Index = 3c4h CRTC_Index = 3d4h Graph_Index = 3ceh Attr_Index = 3c0h ;don't forget to clear flipflop & set bit 5 on index PEL_Write = 3c8h PEL_Read = 3c7h PEL_Data = 3c9h VGASeg dw 0a000h ModeXWidth dw 0 ModeXHeight dw 0 ModeXLogWidth dw 0 ;----------------------------------------------------------------------- ; ; Sets mode # in AX, returns ax=0 if successful, ax=-1 if failed ; cx= width of screen ; ; SetModeX Adapted for VLA by Draeden, ; Originally written by Themie Gouthas, ; who adapted parts from M. Abrash code. ; (Talk about code reuse!) ;------------------------------------------------------------------------ _Mode dw 0 _Scrw dw 0 MACRO @SetModeX DaMode,DaWidth mov ax,DaMode mov cx,DaWidth call _Set_X_Mode ENDM @SetModeX PROC _Set_X_Mode NEAR pusha push es ds cld mov bx,cs mov ds,bx mov es,bx cmp ax,LAST_X_MODE ; have we selected a valid mode? jle @@ValidMode ; Yes ! pop ds es popa mov ax,-1 ; idiot. ret @@ValidMode: mov [_Mode],ax mov [_Scrw],cx mov ax,13h ; let the BIOS set standard 256-color int 10h ; mode (320x200 linear) mov dx,SC_INDEX mov ax,0604h out dx,ax ; disable chain4 mode mov ax,0100h out dx,ax ; synchronous reset while setting Misc ; Output for safety, even though clock ; unchanged mov bx,[_Mode] add bx,bx mov si,[bx + ModeTable] lodsb or al,al jz @@DontSetDot mov dx,MISC_OUTPUT out dx,al ; select the dot clock and Horiz ; scanning rate @@DontSetDot: mov dx,SC_INDEX mov ax,0300h out dx,ax ; undo reset (restart sequencer) mov dx,CRTC_INDEX ; reprogram the CRT Controller mov al,11h ; VSync End reg contains register write out dx,al ; protect bit inc dx ; CRT Controller Data register in al,dx ; get current VSync End register setting and al,07fh ; remove write protect on various out dx,al ; CRTC registers dec dx ; CRT Controller Index cld xor cx,cx lodsb mov cl,al @@SetCRTParmsLoop: lodsw ; get the next CRT Index/Data pair out dx,ax ; set the next CRT Index/Data pair dec cx jne @@SetCRTParmsLoop lodsw mov [cs:ModeXWidth],ax lodsw mov [cs:ModeXHeight],ax mov dx,SC_INDEX mov ax,0f02h out dx,ax ; enable writes to all four planes ; now clear all display memory, 8 pixels mov es,[cs:VGAseg] ; at a time sub di,di ; point ES:DI to display memory sub ax,ax ; clear to zero-value pixels mov cx,8000h ; # of words in display memory rep stosw ; clear all of display memory ; Mode X is set, now set the required logical page width. mov cx,[cs:_Scrw] shr cx,2 mov [cs:ModeXLogWidth],cx shr cx,1 ;divide by 8 mov dx,CRTC_INDEX mov al,13h mov ah,cl out dx,ax pop ds es popa xor ax,ax ret ENDP _Set_X_Mode 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴 ;* MISC planar mode routines 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴 ;ah: 0000b : bit 0= plane 0, bit 1=plane 1, etc.. ; ;DESTROYS: al, dx ; MACRO @Set_Write_Plane mov dx,SC_Index mov al,2 and ah,1111b out dx,ax ENDM @Set_Write_Plane ;ah: plane to latch for read (0-3) ; ;DESTROYS: al, dx ; MACRO @Set_Read_Plane mov dx,Graph_Index mov al,4 out dx,ax ENDM @Set_Read_Plane ;ah: write mode (0-3) ; ;DESTROYS: ax, dx ; MACRO @Set_Write_Mode mov dx,Graph_Index mov al,5 out dx,al inc dx in al,dx and al,11111100b ;clear out write mode bits and ah,00000011b or al,ah out dx,al ENDM @Set_Write_Mode ;ah: Read mode (0-1) ; ;DESTROYS: ax, dx ; MACRO @Set_Read_Mode mov dx,Graph_Index mov al,5 out dx,al inc dx in al,dx and al,11110111b ;clear out write mode bits shl ah,3 ;move bit to correct position and ah,00001000b or al,ah out dx,al ENDM @Set_Read_Mode ;bx: starting offset ; ;DESTROYS: ax, dx ; MACRO @Set_Start_Offset mov dx,CRTC_Index mov al,0ch mov ah,bh ;write the HIGH byte out dx,ax inc al mov ah,bl ;write the LOW byte out dx,ax ENDM @Set_Start_Offset ;ah = pelpan value ; ;DESTROYS: ax, dx ; MACRO @Set_HPP mov dx,InputStatus1 in al,dx ;dummy input mov dx,Attr_Index mov al,33h out dx,al mov al,ah out dx,al ENDM ;DESTROYS: ax, dx - sets pixel pan compatibility ; MACRO @Set_PPC mov dx,InputStatus1 in al,dx ;dummy input mov dx,Attr_Index mov al,30h out dx,al inc dx in al,dx dec dx or al,00100000b out dx,al ENDM ;bx: scanline to set split screen at ; ;DESTROYS: ax, dx ; MACRO @Set_Split mov al,18h mov ah,bl mov dx,CRTC_Index out dx,ax ;set bits 0-7 mov al,09h out dx,al inc dx in al,dx mov ah,bh and ah,00000010b shl ah,5 and al,10111111b or al,ah out dx,al ;set bit 9 dec dx mov al,07h out dx,al inc dx in al,dx and al,11101111b mov ah,bh and ah,00000001b shl ah,4 or al,ah out dx,al ;set bit 8 ENDM @Set_SPlit MACRO @FullVertWait LOCAL @@Vr, @@Nvr mov dx,InputStatus1 @@Vr: in al,dx test al,8 jz @@Vr ;wait until Verticle Retrace starts @@Nvr: in al,dx test al,8 jnz @@Nvr ;wait until Verticle Retrace Ends ENDM @FullVertWait MACRO @WaitVert LOCAL @@Vr mov dx,InputStatus1 @@VR: in al,dx test al,8 jz @@VR ;wait until Verticle Retrace starts ENDM @WaitVert MACRO @WaitVertEnd LOCAL @@NVr mov dx,InputStatus1 @@NVR: in al,dx test al,8 jnz @@NVR ;wait until Verticle Retrace Ends ENDM @WaitVertEnd ;si = offset to palette ;cx = number of colors to write ;al = starting palette register ; ;DESTROYS: dx,si,cx ; MACRO @WritePalette mov dx,cx add cx,cx add cx,dx mov dx,03c8h out dx,al inc dx cld rep outsb ENDM @WritePalette ;Changes the mode back to ModeX after a ResetLinear was called MACRO @ResetModeX mov dx,SC_INDEX mov ax,0604h out dx,ax ; disable chain4 mode mov dx,CRTC_INDEX mov ax,00014h ; turn off dword mode out dx,ax mov ax,0e317h ; turn on byte mode out dx,ax ENDM ;changes from ModeX to normal linear mode ; only will work with an 320x200 screen w/ screenwidth of 80 bytes MACRO @ResetLinear mov dx,SC_INDEX mov ax,0E04h out dx,ax ; enable chain4 mode mov dx,CRTC_INDEX ; reprogram the CRT Controller mov ax,04014h ; turn on dword mode out dx,ax mov ax,0a317h ; turn off byte mode out dx,ax ENDM