[A83] Re: ldir

To: assembly-83@lists.ticalc.org
Subject: [A83] Re: ldir
From: "Dan Weiss" <dwedit@hotmail.com>
Date: Wed, 11 Apr 2001 11:02:19 -0500
Reply-To: assembly-83@lists.ticalc.org


DJNZ Loops can be smaller if you need to init <= 256 bytes.
ld b,0
ld hl,mem
DJNZ_LOOP:
ld (hl),0
inc hl
djnz DJNZ_LOOP

10 bytes I believe.  (this clears 256 bytes of ram)

  Compared to:
ld hl,mem
ld de,mem+1
ld bc,256
ld (hl),0
ldir

13 bytes here... but faster.

Sorry if my byte totals are off...

>From: SOCCERK121@aol.com
>Reply-To: assembly-83@lists.ticalc.org
>To: assembly-83@lists.ticalc.org
>Subject: [A83] Re: ldir
>Date: Wed, 11 Apr 2001 01:22:24 EDT
>
>
>Whoa, good idea, now i dont have to waste a lot of mem with djnz routines!
>
>Thanks!
>
><< ldir can also be used to clear memory:  (this clears the back buffer)
>
>  ld hl,plotsscreen
>  ld de,plotsscreen+1
>  ld bc,767
>  ld (hl),0
>  ldir >>
>
>

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