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CGA4VGA.ASM
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CGA4VGA.ASM
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.model tiny
.code
jumps
org 100h
begin: jmp inst
;Default colors
COLORS:
;Green Red Yellow Low Intensity
;GRYL db 08,1Fh,08, 1Fh,08,08, 12h,12h,08
; db 30,30,30, 20,20,20, 40,40,40
GRYL db 00,42,00, 42,00,00, 42,21,00
;Cyan Magenta White Low
;CMWL db 08,1Fh,1Fh, 1Fh,08h,18h, 1Fh,1Fh,1Fh
; db 38,38,38, 28,28,28, 48,48,48
CMWL db 00,42,42, 42,00,42, 42,42,42
;Cyan Red White Low (Mode 5)
;CRWL db 08,1Fh,1Fh, 1Fh,08h,18h, 1Fh,1Fh,1Fh
; db 38,38,38, 28,28,28, 48,48,48
CRWL db 00,42,42, 42,00,00, 42,42,42
;Green Red Yellow High
;GRYH db 10,2Fh,10, 2Fh,10,10, 20h,20h,10
; db 40,40,40, 30,30,30, 50,50,50
GRYH db 21,63,21, 63,21,21, 63,63,15
;Cyan Magenta White High
;CMWH db 10,2Fh,2Fh, 2Fh,10,20h, 2Fh,2Fh,2Fh
; db 48,48,48, 38,38,38, 58,58,58
CMWH db 15,63,63, 63,21,63, 63,63,63
;Cyan Red White High (Mode 5)
;CRWH db 08,1Fh,1Fh, 1Fh,08h,18h, 1Fh,1Fh,1Fh
; db 38,38,38, 28,28,28, 48,48,48
CRWH db 21,63,63, 63,21,21, 63,63,63
func dw 0
MAXV equ 54
int10 proc
mov cs:[func],ax
pushf
db 09Ah
old10 dd 0
push dx ax ds si
cld
push cs
pop ds
mov ax,[func]
cmp ax,4
je load_mode4
cmp ax,5
je load_mode5
jmp exit_int
load_mode4:
mov dx,3C8h
mov si,offset GRYL
mov al,2
call setcol
mov al,4
call setcol
mov al,6
call setcol
mov si,offset CMWL
mov al,3
call setcol
mov al,5
call setcol
mov al,7
call setcol
mov si,offset GRYH
mov al,18
call setcol
mov al,20
call setcol
mov al,22
call setcol
mov si,offset CMWH
mov al,19
call setcol
mov al,21
call setcol
mov al,23
call setcol
jmp exit_int
load_mode5:
mov dx,3C8h
mov si,offset CRWL
mov al,2
call setcol
mov al,4
call setcol
mov al,6
call setcol
mov si,offset CRWL
mov al,3
call setcol
mov al,5
call setcol
mov al,7
call setcol
mov si,offset CRWH
mov al,18
call setcol
mov al,20
call setcol
mov al,22
call setcol
mov si,offset CRWH
mov al,19
call setcol
mov al,21
call setcol
mov al,23
call setcol
jmp exit_int
exit_int:
pop si ds ax dx
iret
int10 endp
setcol:
out dx,al
inc dx
lodsb
out dx,al
lodsb
out dx,al
lodsb
out dx,al
dec dx
ret
mult proc
cmp ax,0FE01h
jne em
push es di ax
cld
push cs
pop es
mov di,offset COLORS
;Quick sanity check
;We have same offsets, just diff segments
cmp di,si
jne exit_mult
mov cx,MAXV
rep movsb
exit_mult:
pop ax di es
xchg ah,al
iret
em: db 0EAh
old2F dd 0
mult endp
;================================================================================
inst proc
;Banner
mov dx,offset mess
mov ah,09h
int 21h
jmp install
mess db 0Dh,0Ah
db 'CGA4VGA (c) 2024 Serhii Liubshin',0Dh,0Ah
db 'Sets colors for CGA modes 4 and 5 on VGA videocard',0Dh,0Ah
db 0Dh,0Ah,'$'
alred db 'CGA4VGA already installed. TSR colors updated',0Dh,0Ah,'$'
load_msg db 'Error loading file', 0dh,0ah,'$'
unrec_msg db 'Invalid delimiter in file', 0dh,0ah,'$'
number_msg db 'Invalid color value in file', 0dh,0ah,'$'
incorr_msg db 'Incorrect number of values in file, must be exactly 54 or 9', 0dh,0ah,'$'
good_msg db 'Color values loaded', 0dh,0ah,'$'
tsr_msg db 'Installed. Run w/o parameters to reset colors to defaults',0Dh,0Ah
db 'or specify configuration file to update color values from',0Dh,0Ah,'$'
skip_spaces macro
local @@skipb
@@skipb:
lodsb
sub bp,1
js end_cmd_process
cmp al,20h ;' '
jz @@skipb
cmp al,0Dh
jz end_cmd_process
endm
put_chars macro
local @@next, @@fin
mov cx,64
@@next:
stosb
lodsb
sub bp,1
js @@fin
cmp al,20h
jz @@fin
cmp al,0Dh
jz @@fin
loop @@next
@@fin:
xor al,al
stosb
endm
install:
cld
mov si,80h
xor ax,ax
lodsb
mov bp,ax
test bp,bp
jz no_parameter
xor ax,ax
mov es:[infile],al
mov di,offset infile
skip_spaces
put_chars
end_cmd_process:
mov al,es:[infile]
cmp al,0
jz no_parameter
;Load file
mov ah,3Dh ; Function 3Dh - Open file
mov al,0 ; Open for reading
mov dx,offset infile ; Pointer to filename
int 21h
jc load_error
mov bx,ax ; BX holds the file handle
mov dx,offset buf
mov ah,3Fh ; Function 3Fh - Read file
mov cx,1024
int 21h
jnc load_ok
load_error:
mov dx,offset load_msg
mov ah,9
int 21h
mov ax,4C01h
int 21h
load_ok:
mov [inlen],ax
mov ah,3Eh ; Function 3Eh - Close file
int 21h
mov si, offset buf
mov di, offset COLORS
mov bp,[inlen]
inc bp
xor ax,ax
xor cx,cx
next_val:
xor bx,bx
dec bx
next_num:
lodsb
dec bp
jnz next_one ;if we have a number, push it
test bx,bx
js no_pend
mov al,bl
cmp al,3Fh
ja too_big
inc cx
cmp cx,MAXV
ja incorr
stosb
no_pend:
jmp end_process
next_one:
cmp al,30h
jb not_digit
cmp al,39h
ja not_digit
sub al,30h
test bx,bx ;are we processing number?
jns next_digit
xor bx,bx
mov bx,ax
jmp next_num
next_digit:
add bx,bx
mov dx,bx
add bx,bx
add bx,bx
add bx,dx
add bx,ax
jmp next_num
not_digit:
test bx,bx
js no_number
;Push number
mov al,bl
cmp al,3Fh
ja too_big
inc cx
cmp cx,MAXV
ja incorr
stosb
jmp next_val
no_number:
cmp al,'#'
je skip_comment
cmp al,';'
je skip_comment
;Delimiters
cmp al,' '
je next_val
cmp al,','
je next_val
cmp al,08
je next_val
cmp al,0Dh
je next_val
cmp al,0Ah
je next_val
mov dx,offset unrec_msg
mov ah,9
int 21h
jmp exii
too_big:
mov dx,offset number_msg
mov ah,9
int 21h
jmp exii
incorr:
mov dx,offset incorr_msg
mov ah,9
int 21h
jmp exii
exii:
mov ax,4C01h
int 21h
skip_comment:
lodsb
dec bp
jz end_process
cmp al,0Ah
jne skip_comment
jmp next_val
end_process:
;How many color values we got?
cmp cx,MAXV
je go_go
cmp cx,9
jne incorr
;Copy first palette to all other
mov si,offset colors
mov di,offset CMWL
mov cx,9
rep movsb
mov cx,9
rep movsb
mov cx,9
rep movsb
mov cx,9
rep movsb
mov cx,9
rep movsb
go_go:
mov dx,offset good_msg
mov ah,9
int 21h
;Check if we already resident and update colors
no_parameter:
mov si,offset COLORS
mov ax,0FE01h
int 2Fh
cmp ax,01FEh
jne ins1
mov ah,09h
mov dx,offset alred
int 21h
ret
ins1:
cld
cli
xor ax,ax
mov ds,ax
push cs
pop es
mov si,10h*4
mov di,offset old10
movsw
movsw
mov si,2Fh*4
mov di,offset old2F
movsw
movsw
push ds
pop es
mov di,10h*4
mov ax,offset int10
stosw
mov ax,cs
stosw
mov di,2Fh*4
mov ax,offset mult
stosw
mov ax,cs
stosw
sti
push cs
pop ds
mov dx,offset tsr_msg
mov ah,9
int 21h
mov dx,offset inst
int 27h
inst endp
inlen dw ?
infile db 64 dup (?)
buf db 1024 dup (?)
end begin