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Technotools (Chestnut CD-ROM)(1993).ISO
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vgakit41
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svgamode.asm
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Assembly Source File
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1991-10-02
|
2KB
|
134 lines
include model.h
;
; VGAKIT Version 4.1
;
; Copyright 1988,89,90,91 John Bridges
; Free for use in commercial, shareware or freeware applications
;
; SVGAMODE.ASM
;
;
.data
extrn cirrus:byte,everex:byte,paradise:byte,tseng:byte,trident:byte
extrn t8900:byte,ativga:byte,aheada:byte,aheadb:byte
extrn oaktech:byte,video7:byte,chipstech:byte,tseng4:byte,genoa:byte
extrn ncr:byte,compaq:byte,vesa:byte
extrn vga512:byte,vga1024:byte
extrn curbk:word
public maxx,maxy,xwidth
maxx dw ? ;xwidth of screen in pixels
maxy dw ? ;height of screen in pixels
xwidth dw ? ;actual xwidth of screen in bytes
.code
public svgamode
public txtmode
public setmany
svgamode proc ;Set 640x480x256 on most SVGA cards
cmp [vesa],0
jz novs
mov ax,4f02h
mov bx,101h
jmp godo
novs: cmp [compaq],0
jz nocp
mov ax,2eh
jmp godo
nocp: cmp [genoa],0
jz nogn
mov ax,5ch
jmp godo
nogn: cmp [ncr],0
jz noncr
mov ax,5fh
jmp godo
noncr: cmp [oaktech],0
jz noak
mov ax,53h
jmp short godo
noak: cmp [aheada],0
jnz @f
cmp [aheadb],0
jz noab
@@: mov ax,61h
jmp short godo
noab: cmp [everex],0
jz noev
mov ax,70h
mov bl,30h
jmp short godo
noev: cmp [ativga],0
jz noati
mov ax,62h
jmp short godo
noati: cmp [trident],0
jz notr
mov ax,5dh
jmp short godo
notr: cmp [video7],0
jz nov7
mov ax,6f05h
mov bl,67h
jmp short godo
nov7: cmp [chipstech],0
jz noct
mov ax,79h
jmp short godo
noct: cmp [paradise],0
jz nopd
mov ax,5fh
jmp short godo
nopd: cmp [tseng],0
jz nots
mov ax,2eh
godo: int 10h
mov [curbk],-1
mov ax,640
mov [maxx],ax ;default xwidth to 640 for now
cmp [compaq],0
jz nokludge
mov ax,1024
nokludge:
mov [xwidth],ax
mov ax,40h
mov es,ax
mov al,es:[84h] ;get height of screen
inc al
mul byte ptr es:[85h]
mov [maxy],ax
nots: ret
svgamode endp
txtmode proc
mov ax,3
int 10h
ret
txtmode endp
setmany proc palbuf:ptr byte,begcol:word,numcol:word
if @Datasize
les dx,[palbuf]
else
mov ax,ds
mov es,ax
mov dx,[palbuf]
endif
mov bx,[begcol]
mov cx,[numcol]
mov ax,1012h
int 10h
ret
setmany endp
end