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 04202h ; start horz blanking
dw 09f03h ; end horz blanking
dw 04c04h ; start h sync
dw 00005h ; 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 256
dw 240
LABEL X256Y200 word
db 0e3h ; dot clock
db 8 ; Number of CRTC Registers to update
dw 05f00h ; horz total
dw 03f01h ; horz displayed
dw 04202h ; start horz blanking
dw 09f03h ; end horz blanking
dw 04c04h ; start h sync
dw 00005h ; end h sync
dw 00014h ; turn off dword mode
dw 0e317h ; turn on byte mode
dw 256
dw 200
LAST_X_MODE = 14
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
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
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
────────────────────────────────────────────────────────────────────────────
;* MISC planar mode routines
────────────────────────────────────────────────────────────────────────────
;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
