How do I Screen delay and Cls

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adroit

Joined: 21 Feb 2010
Posts: 252

adroit 07 Mar 2010, 19:34

Ahh, I see. These are all the deterrents of DOS programming - it's a headache. But as I go along, I pick up a few stuff here and there. Thanks alot guys.

One more question: How do you know when your advanced in programming?

07 Mar 2010, 19:34

baldr

Joined: 19 Mar 2008
Posts: 1651

baldr 07 Mar 2010, 20:02

MeshNix,

It's simple: when you stop asking yourself such questions. Wink

07 Mar 2010, 20:02

edfed

Joined: 20 Feb 2006
Posts: 4354
Location: Now

edfed 07 Mar 2010, 20:49

and i can say more:

when you can answer to advanced questions.

one thing is sure, you SHOULD code A LOT to become an advanced programmer

07 Mar 2010, 20:49

adroit

Joined: 21 Feb 2010
Posts: 252

adroit 09 Mar 2010, 21:09

Thanks guys, I think i've got a grip of the concept

09 Mar 2010, 21:09

edfed

Joined: 20 Feb 2006
Posts: 4354
Location: Now

edfed 12 Mar 2010, 17:05

cool, welcome to code addicts. Smile

12 Mar 2010, 17:05

adroit

Joined: 21 Feb 2010
Posts: 252

adroit 17 Mar 2010, 20:47

Thanks Guys

17 Mar 2010, 20:47

adroit

Joined: 21 Feb 2010
Posts: 252

adroit 04 Nov 2010, 03:32

OLD POST

Ok guys, I'm back again with the same question, but this time, a little less vague.
I would like to know how to do a screen delay? Meaning, the program waiting for a given time before continuing onto the next instruction. For example:

algorithm:

I want to know how to do something like that.

(Thank in advance)

04 Nov 2010, 03:32

baldr

Joined: 19 Mar 2008
Posts: 1651

baldr 04 Nov 2010, 09:17

MeshNix,

For a simple solution you may wait for 5*18.2 timer ticks to pass using 0:46Ch in BIOS data area. RTC can be used too (ports 70h/71h).

There is int 15h/86h BIOS service.

04 Nov 2010, 09:17

Picnic

Joined: 05 May 2007
Posts: 1416
Location: Piraeus, Greece

Picnic 05 Nov 2010, 08:12

Quick & dirty solution with this old gem.
Notice that both this and baldr's suggestion won't work on XP.

Code:

mov cx, 18   ; 1-second delay
hlt
loop $-1

05 Nov 2010, 08:12

baldr

Joined: 19 Mar 2008
Posts: 1651

baldr 05 Nov 2010, 08:46

Picnic,

You should mask all IRQs except IRQ0 for this to work as expected. "Work on XP" — did you mean "in NTVDM"? It works there.

05 Nov 2010, 08:46

Picnic

Joined: 05 May 2007
Posts: 1416
Location: Piraeus, Greece

Picnic 05 Nov 2010, 08:59

I think that Windows XP does not support this interrupt 15h/86h.

05 Nov 2010, 08:59

adroit

Joined: 21 Feb 2010
Posts: 252

adroit 08 Nov 2010, 00:32

Unfortunately, I use XP.

I cannot recall properly, but I saw someone using a code similar to this, to delay the computer:

Code:

mov ax,0
mov cx,65365
.loop:
mov [es:di],ax
loop .loop

[Don't quote me on this]

08 Nov 2010, 00:32

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20621
Location: In your JS exploiting you and your system

revolution 08 Nov 2010, 01:50

MeshNix wrote:

[Don't quote me on this]

Hehe, couldn't resist quoting you on that. Wink

08 Nov 2010, 01:50

bitRAKE

Joined: 21 Jul 2003
Posts: 4224
Location: vpcmpistri

bitRAKE 08 Nov 2010, 04:10

http://ip-tietgennet.tietgen.dk/staff/mlha/PC/Prog/asm/int/21/index.htm#2C

DOS Services INT 21, AH=2C

Should work from dosbox on WinXP.

Get time, add delay, and wait for projected time.

08 Nov 2010, 04:10

rugxulo

Joined: 09 Aug 2005
Posts: 2341
Location: Usono (aka, USA)

rugxulo 08 Nov 2010, 15:07

Sorry guys, been preoccupied these past few days, kept forgetting to post this, hope it helps:

Code:

; wait_for_me
wait_for_me:
        push cx                        ; CX = seconds to wait (max. 59)
        call scroll                    ; only scroll if at screen bottom

        mov si,offset pauze_msg
        call getlen

;        mov bp,si
;        add bp,ax
;        dec bp
;        dec bp
        xchg ax,bx
        lea bp,[si+bx-2]               ; saves two bytes

        test word ptr [suboptions],(SUBOPT_H or SUBOPT_Y)
        jnz wait_for_me_no_msg

        cmp byte ptr [scroll_status],1 ; if scrolled, don't print CR+LF
        jz wait_for_me_no_crlf

        call print_crlf2               ; (non-redirectable)

wait_for_me_no_crlf:
        call print2                    ; (non-redirectable)
wait_for_me_no_msg:
        pop cx
        cmp cl,60

;        jnb wait_for_me_goto_end       ; (won't fit w/ some asms)
        jb wait_for_me_here
        jmp wait_for_me_ret            ; cheesy workaround  
wait_for_me_here:
        xor ch,ch
        mov bx,cx
        mov ah,2Ch
        int 21h                        ; get current DOS time
        add bl,dh                      ; DH = seconds
        cmp bl,60
        jb wait_for_me_check
        sub bl,60
wait_for_me_check:
        int 21h
        push ax
        push bx
        cmp bl,dh
        jae wait_for_me_okay
        add bl,60
wait_for_me_okay:
        sub bl,dh
        mov al,bl

;        xor ah,ah                      ; =
;        mov cl,10                      ; =
;        div cl                         ; = 6 bytes
        aam                            ; =
        xchg ah,al                     ; = 4 bytes

        or ax,'00'                     ; convert to ASCII

        mov di,bp
        mov si,di

        scasw                          ; prevents cursor flickering
        jz wait_for_me_no_print
        mov di,si
        stosw

;        push ax                        ; this helps prove that it doesn't
;        mov al,BEEP                    ;   display more often than needed
;        int 29h                        ;   (i.e. only when secs. changed)
;        pop ax

        test word ptr [suboptions],(SUBOPT_H or SUBOPT_Y)
        jnz wait_for_me_no_print

        mov al,BACKSPACE
        mov bx,offset print_char2
        call bx
        call bx                        ; backup the cursor twice
        lodsb
        call bx                        ; overwrite countdown digits
        lodsb
        call bx

wait_for_me_no_print:
        pop bx
        mov ah,0Bh
        int 21h                        ; check for keypress
        test al,al                     ;  (and eat extended byte, if exists)
        pop ax
        jz wait_for_me_compare
        mov ah,8
        int 21h                        ; get keypress w/o echo
        cmp al,ESCAPE_KEY              ; on Esc, disable pauzing (/P)
        jnz wait_for_me_test
        or word ptr [options],OPT_P
        and word ptr [suboptions],not SUBOPT_H
wait_for_me_test:
        cmp al,'p'                     ; 'p' or 'P' pauzes the countdown
        jz wait_for_me_really_wait
        cmp al,'P'
        jnz wait_for_me_test2
wait_for_me_really_wait:
        push ax
;        mov ah,8
wait_for_me_test_again:
        int 21h                        ; get keypress w/o echo
        test al,al
        jz wait_for_me_test_again
        pop ax
wait_for_me_test2:
        test al,al                     ; if zero, extended keypress
        jnz wait_for_me_ret
        int 21h                        ; so, eat next (extended) byte
wait_for_me_goto_end:
        jmp short wait_for_me_ret
wait_for_me_compare:
        cmp bl,dh

        jnz wait_for_me_check         ; used to be too big for short jump
;        jz wait_for_me_ret
;        jmp wait_for_me_check
wait_for_me_ret:
        ret

08 Nov 2010, 15:07

adroit

Joined: 21 Feb 2010
Posts: 252

adroit 10 Nov 2010, 01:41

lol

[b]revolution Laughing

bitRake, I'll see what I can do

rugxolu, i've got to analyze this code

...ill be back

10 Nov 2010, 01:41

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