[A83] Re: Defined Variables
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[A83] Re: Defined Variables
You can load bc, de, and hl with 16 bit words from ram...
ld bc,(pencol) works fine...
You can even store too...
ld bc,$1C20
ld (pencol),bc
and you're not even using hl or a...
But you can only use A or HL for single register stuff.
ld b,(hl)
ld a,(pencol)
so you can't:
ld b,(penrow)
unless you use BOTH b and c.
>From: Gavin Olson <gtolson@snet.net>
>Reply-To: assembly-83@lists.ticalc.org
>To: assembly-83@lists.ticalc.org
>Subject: [A83] Re: Defined Variables
>Date: Mon, 24 Sep 2001 14:51:46 -0400
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>
>At 03:59 PM 9/23/2001 -0600, you wrote:
>
> >Thanks, I have part of it working. When I try to assign the value in
>(VAR)
> >to a register however, I get an error.
> >
> >ld (VAR),a ;works fine
> >
> >
> >The error I get is "Unused data in MS byte of argument. (82)", in
>reference
> >to the line which I have this on (I've tried both):
> >
> >ld b,VAR
> >or
> >ld b,(VAR)
> >
> >Again, its probably some idiotic syntax thing, so bear with me.
>
>Actually, it is a hardware restriction whereby only the accumulator and hl
>can do memory access. You need to use a or hl whenever you do anything
>with memory.
>
>
>
>
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