[A83] Re: Getting a value from a data table

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[A83] Re: Getting a value from a data table


To add a little more info:

.db 01h gives:
 01
in the output,
.dw 01h gives
 0100
.dw 3421h gives
 2134 

in output (all output is hexadecimal).

.dw switches byte order too...

 
> 
> .db makes the compiler reserve 1 byte for data
> .dw makes the compiler reserve 2 bytes (1 word) for data
> 
> > -----Oorspronkelijk bericht-----
> > Van: assembly-83-bounce@lists.ticalc.org
> > [mailto:assembly-83-bounce@lists.ticalc.org]Namens TypeR unknown
> > Verzonden: Wednesday, January 23, 2002 18:03
> > Aan: assembly-83@lists.ticalc.org
> > Onderwerp: [A83] Re: Getting a value from a data table
> > 
> > 
> > 
> > About data tables; what's the exact difference between .db and .dw ?
> > 
> > 
> > >From: Peter-Martijn Kuipers <hyper@hbyte.net>
> > >Reply-To: assembly-83@lists.ticalc.org
> > >To: assembly-83@lists.ticalc.org
> > >Subject: [A83] Re: Getting a value from a data table
> > >Date: Tue, 22 Jan 2002 09:18:22 +0100 (CET)
> > >
> > >
> > > > >
> > > > >Personally i'd go for
> > > > >ld de, datatable + (4*5) +3  ; start table + ((4)* row length [to 
> > >select
> > > > 4rth
> > > > >column]) + 3
> > > > >
> > > > >this assumes 0,0 is the origin, not 1,1
> > > > >
> > > > >> so de is now 13, which was at 4,3 in the data table
> > > > >>
> > >
> > > > That simply loads the memory address of datatable+(4*5)+3 
> > into de, and 
> > >that
> > > > isn't even the byte of the table that he wants to find.  Try this:
> > > >
> > > > ld a,(datatable+(3*5)+2)     ;a=byte (4-1),(3-1) or 3, 2
> > >
> > >Ofcourse...
> > >I thought he wanted the mem address in de to ld from himself
> > >
> > >
> > > > - - Joe
> > > >
> > > >
> > > > --------------------------------
> > > > Joe Pemberton
> > > > http://tiworld.calc.org
> > > > --------------------------------
> > > >
> > > >
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References: