RE: LZ: MORE HELP NEEDED

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RE: LZ: MORE HELP NEEDED

it didnt work... thanx tho.. i figured it out i used jr nz,exitloop.... that 
worked... do you have any suggestions for the type program i should write next 
to learn more...


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From: 	owner-list-zshell@lists.ticalc.org on behalf of Peter Cordes
Sent: 	Wednesday, September 25, 1996 6:26 PM
To: 	list-zshell@lists.ticalc.org
Subject: 	Re: LZ: MORE HELP NEEDED


Frank wrote:
> 
> Well im just bout there.... i still have one major bug that i (being a 
newbie)
> cant yet figure out.. why wont this program exit... i have made sure all my
> call_'s have ret statements and im confused for the 5th time here is the 
code
> anyone who can figure out why it wont exit i would appreciate it...
> 
> #include "ti-85.h"
> .org 0
> .db "By Frank Apap",0
> 
> Init:
>  ld a,4
>  out (5),a
>  ROM_CALL(CLEARLCD)
>  ld b,40                   ; x start
>  ld c,30                   ; y start
> 
> Start:
>     call GET_KEY   ; get a key
>     cp $04         ; up ?
>      jr nz,nextkey
>     CALL_Z(up)
>      JUMP_(Start)
> 
> nextkey:
>     cp $01         ; down
>     CALL_Z(down)
> 
>     cp $02           ; left?
>     CALL_Z(left)
> 
>     cp $03        ; right
>     CALL_Z(right)
> 
>     cp $37              ;exit
>     JUMP_Z(exit)
> 
>     cp $0F   ;clear
>     JUMP_Z(clear)
> 
>     JUMP_(Start)    ; loop
> up:
>   inc c  ; x=x+1
>   CALL_(PlotPixel) ; draw it
>   ret
> 
> down:
>      dec c ; x=x-1
>      CALL_(PlotPixel)
>      ret
> 
> right:
>   inc b  ; y=y+1
>   CALL_(PlotPixel) ; draw it
>   ret    ; go back
> 
> left:
>   dec b  ; y=y-1
>   CALL_(PlotPixel) ; draw it
>   ret   ; go back
> clear:
>     ROM_CALL(CLEARLCD)
>     JUMP_(init)
> 
> PlotPixel:
>     ROM_CALL(FIND_PIXEL)
>     ld de,$FC00
>     add hl,de
>     or (HL)
>     ld (HL),a
>     ret
> 
> exit:
>      ROM_CALL(CLEARLCD)
>      ld hl,$1A1A
>      ld ($8333), hl
>      ld hl, (PROGRAM_ADDR)
>      ld de,bye
>      add hl,de
>      ROM_CALL(D_ZM_STR)
> exitloop:
>    call GET_KEY
>    cp $37
>    ret z
>    jr exitloop <<< make this line state JUMP_Z(exitloop)
> 
> 
> bye: .db "BYE THANKS FOR TESTING",0  ; Displays this line then freezes
> .end


note that is just my theory of a fix.
PCoMP
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