[A83] Re: IX and IY Help

To: <assembly-83@lists.ticalc.org>
Subject: [A83] Re: IX and IY Help
From: "Tijl Coosemans" <tijl@ulyssis.org>
Date: Wed, 12 Dec 2001 00:23:17 +0100
References: <1008111057.3c168dd1a4923@mailbox1.cc.stevens-tech.edu>
Reply-To: assembly-83@lists.ticalc.org


> From: <tlutz@stevens-tech.edu>
>
> I have heard that IX and IY can use offsets. I have no clue how to use
them
> yet. Maybe someone could help me out a little bit. Can IX read a byte but
not
> inside a byte boundary?? And write to it too?

IX and IY can be used with byte offsets. As example lets point IX to 8000h.
Now I can load the byte at 8002h directly into the accumulator with LD
A,(IX+2).

8000h    1Fh
8001h    23h
8002h    45h

    ld    ix,8000h    ; point IX to 8000h
    ld    a,(ix+2)    ; now A is 45h

You can also use LD A,(IX-4) for instance.

References:

[A83] IX and IY Help

From: tlutz@stevens-tech.edu

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