Re: LZ: A new programming question
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Re: LZ: A new programming question
Nathan Adams wrote:
>
> I have question about memory. Say I have the letters a through e stored in
> memory locations $80DF through $80E3 and I want to delete the b stored in
> $80E0 and then shift the contents of the rest of the memory that I have used
> to take up the slack so it would look something like this:
>
> (This isn't assembly language, just a table of values)
> Before: After:
> $80DF = a $80DF = a
> $80E0 = b $80E0 = c
> $80E1 = c $80E1 = d
> $80E2 = d $80E2 = e
> $80E3 = e $80E3 = nothing
>
> Is there a short and fast way of doing this?
Yup, you should use LDIR:
ld hl,$80E1 ; Copy from $80E1
ld de,$80E0 ; To $80E0
ld bc,$0003 ; 3 bytes
ldir ; Do the copy!
xor a ; Clear A for storage,
ld (de),a ; if you really want to put a 0 at $80E3
--
Jimmy Mårdell "To tell you the truth I'm so damned tired
mailto:mja@algonet.se A life-long leave is what I require
http://www.algonet.se/~mja Rules, regulations try to form us
IRC: Yarin But not me, I'm gonna be enormous" /CRD
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