Coming in from the cold...

Index > Windows > Coming in from the cold...

Author

Thread

sittingduck

Joined: 31 Dec 2007
Posts: 7

sittingduck 31 Dec 2007, 12:24

Yes, have done alot of asm coding in 68000 series.
But new to I386.
Q1: What Instruction set should i use?
Have an Opteron, Xeon, & pentium4, same to all?

Q2: in some Instruction sets several instructions are missing
like 'stosb' for example why?

Q3: Tried some of the simple examples on this forum, like
turn on gfx & plot a dot, but screen turns black no dot
and never come back... Missing anything?

Code:

org 256

        mov ax,$13
        int $10

plot:
        mov al,255
        mov bx,160
        mov cx,100      
        push $a000
        pop es
        push ax
        mov ax,320
        mul cx
        add ax,bx
        mov di,ax
        pop ax
        stosb

        mov ax,$03
        int $10
        int 20h

Q4: Please help NOW Smile

i really wanna go from 68000 series...

Edit by moderator: Please use code tags next time

31 Dec 2007, 12:24

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20299
Location: In your JS exploiting you and your system

revolution 31 Dec 2007, 12:52

A1: The basline instructions are all the same. But MMX, SSE*, 3DNOW support differs between CPU's.

A2: stosb is a baseline instruction. All CPU's can do it.

A3: Try this before you change back to mode 3

Code:

mov ah,0 ;wait for a key before exiting
int 16h

A4: Check the AMD and Intel websites for the specs.

31 Dec 2007, 12:52

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 31 Dec 2007, 13:24

A4: http://x86asm.net/links/index.html

31 Dec 2007, 13:24

sittingduck

Joined: 31 Dec 2007
Posts: 7

sittingduck 31 Dec 2007, 23:50

Thank you very much, just what i need

31 Dec 2007, 23:50

sittingduck

Joined: 31 Dec 2007
Posts: 7

sittingduck 31 Dec 2007, 23:54

and btw...
this does no work why?

org 256

mov ax,$13
int $10

plot:
mov al,255
mov bx,160
mov cx,100
push $a000
pop es
push ax
mov ax,320
mul cx
add ax,bx
mov di,ax
pop ax
stosb

mov ah,0 ;wait for a key before exiting
int 16h

mov ax,$03
int $10

int 20h

31 Dec 2007, 23:54

sittingduck

Joined: 31 Dec 2007
Posts: 7

sittingduck 01 Jan 2008, 00:47

revolution wrote:

A1: The basline instructions are all the same. But MMX, SSE*, 3DNOW support differs between CPU's.

What are the baseline instructions?

If i want my code to work on all PCs should i avoid
MMX,SSE and 3DNOW?

01 Jan 2008, 00:47

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 01 Jan 2008, 10:50

Quote:

What are the baseline instructions?

those which are present on every processor since 386 Smile

Quote:

If i want my code to work on all PCs should i avoid
MMX,SSE and 3DNOW?

practically all new processor has MMX present (it's there since around Pentium Pro I think). But generaly yes, if you use only "baseline instructions", you won't have problems

01 Jan 2008, 10:50

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20299
Location: In your JS exploiting you and your system

revolution 01 Jan 2008, 10:58

sittingduck wrote:

and btw...
this does no work why?

I haven't used the old 256 colour mode for a long time. But, from memory, it uses a palette to map the 8 bit pixel to the screen colour. Perhaps you could try mov al,15. IIRC 15 will be bright white.

01 Jan 2008, 10:58

< Last Thread | Next Thread >

Forum Rules:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum