pixel in asm

Fri, 03 Nov 2000 08:57:04 -0700

cpu: amd k6-2 500 
system: win98 
compiler: c++ (ms-dos) 
 
is it correct to draw a pixel?: 
 
int 10h 
mov ah,00h 
mov al,13h 320x200x256 
 
int 10h 
mov ah,0ch 
mov al,5 
mov bh,(page) 
mov cx,15 
mov dx,25 
 
question 1: what is "page"? 
question 2: i've tried to put some values in bh but it doesn't works; the screen is black and I can't see any pixel drawed. 
Thanks.

Re: pixel in asm

Sat, 04 Nov 2000 13:28:04 -0700

You have everything backwards. The registers need to be loaded BEFORE calling the INT. 
 
: cpu: amd k6-2 500 
: system: win98 
: compiler: c++ (ms-dos) 
: 
: is it correct to draw a pixel?: 
 
mov ah,00h 
mov al,13h 320x200x256 
 
: int 10h 
 
mov ah,0ch 
mov al,5 
mov bh,(page) 
mov cx,15 
mov dx,25 
: int 10h 
: 
: question 1: what is "page"? 
 
Well, in your case, just put 0 in for bh. A video page is just a backbuffer, an offscreen buffer, or a double-buffer, whichever term you prefer. 
 
However, mode 13h doesn't have any extra pages, but you can still make a software double-buffer. 
 
: question 2: i've tried to put some values in bh but it doesn't works; the screen is black and I can't see any pixel drawed. 
 
It might work now. 
: Thanks. 
: 
: 
:

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