Hi,
I am trying the code provided by Steve (with some modification) on this forum but some how its not displaying the pixel. I dont know if there is a color problem. If some body can guide me, i would be thankful for this.
.MODEL TINY
.CODE
ORG 0
;code branch
boot0: jmp short boot1
boot1: cli ;disable maskable interrupts
xor di,di
mov ss,di
mov sp,7C00h ;SS:SP = 0000:7C00
sti
;----------------------
cld
mov ax,0B800h
mov es,ax
xor di,di
mov ax,1F41h
stosw
;-----------------------
mov ah, 0
int 16h
;-----------------
MOV AH,0 ; Function 0
MOV AL,13H ; set 320 x 200 256 color mode
INT 10H ; Video BIOS Call
;--------------Use function 0BH to write a pixel.
;-----Code:
MOV AH,0BH ; function 0BH
MOV BH,0 ; page number
MOV CX,100 ; X or column
MOV DX,100 ; Y or row
MOV AL,15 ; Color value
INT 10H ; Video BIOS Call
ORG 1FEH
dw 0AA55h
;----------------------------------------------------------------------------------
END boot0
Zulfi.
hiya Zulfi
the beauty of video mode 13h is, you can write pixels directly to the video buffer - very fast
but, the bios call will work also
i see one problem that may fix it - you have row 256 and column 256
there are only 200 rows, numbered 0 to 199 (0 to 0C7h)
Hi,
No he has 100 not 100H, so that's not the problem. He has no
"halt" code, so he's not terminating cleanly. He may be resetting
or some such so he doesn't see anything.
Regards,
Steve N.
you got me Steve - lol
i cudda swore i saw 100h - gettin old, here
he should have a dead loop at the end
it could be he has chosen a poor color, too - i don't remember the standard palette
might try a colour of 255
ohhhhhhhhhhhhhhhh
lol
function 0Bh - wrong function
you want function 0Ch, Zulfi
mov ax,13h ;set mode 13h
int 10h
xor bx,bx
mov cx,100
mov dx,100
mov ax,0C0Fh ;write pixel, colour=15
int 10h
Oops, good catch Dave.
Regards,
Steve N.
Hi,
Thanks. Its working now.
Zulfi.