Subject:
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Re: Help in Assembler
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Fri, 7 Nov 1997 17:03:53 GMT
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Original-From:
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MAR ERICSON <MAR@COOPER.EDUnomorespam>
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Viewed:
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1553 times
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What is "ORG"? Does it matter what number you use?
Is the number a memory location?
Thanks for any help! :)
-----------
ericson mar
Master of Engineering Candidate
Project: Mobile Robotics
mar@cooper.edu
(212)353-4356
Department of Mechanical Engineering
The Cooper Union for the Advancement of Science and Art
-------------------------------------------------------
On Wed, 5 Nov 1997, Brian S Jappinen wrote:
> > From mar@cooper.edu Wed Nov 5 18:33:16 1997
>
> > Consider a part of a program:
> >
> > var1 FCB 1
> > var2 FCB 7
> > var3 FCB 4
> > .
> > .
> > .
> > varN FCB ?
> >
> > If I want to use a variable (say X) to determine when to use "var1" to
> > "varN", how can I do this (other than a whole bunch of CMP's).
> > (i.e. when X = 3, I want to access var3)
> >
> > I guess what I'm asking is...Is there a way to indicate the address var3
> > as "the address of var1 plus an offset"?
>
> I think this might be what you want to do:
>
> varind FCB $00 * 0 <= varind <= FF
>
> ORG $c100 * some location of table
> var1 FCB 1
> var2 FCB 7
> var3 FCB 4
> .
> .
> .
> varN FCB ?
> .
> .
> tabadr FDB #$c100 * address where table is stored
>
> start ORG $c000
> LDX tabadr
> .
> .
> .
> INC num
> .
> .
> LDAA num,x
>
>
> Note: 0,x would access the first element of the table.
>
> You might think about a hash table.
>
> Scott
>
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Message is in Reply To:
 | | Re: Help in Assembler
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| (...) I think this might be what you want to do: varind FCB $00 * 0 <= varind <= FF ORG $c100 * some location of table var1 FCB 1 var2 FCB 7 var3 FCB 4 . . . varN FCB ? . . tabadr FDB #$c100 * address where table is stored start ORG $c000 LDX tabadr (...) (27 years ago, 6-Nov-97, to lugnet.robotics.handyboard)
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