[A83] Re: Point of making your own lcd_busy?

To: <assembly-83@lists.ticalc.org>
Subject: [A83] Re: Point of making your own lcd_busy?
From: "Ronald Teune" <rtwolf@gmx.net>
Date: Sun, 2 Feb 2003 16:26:02 +0100
References: <OE41b6GYBp80SiEmAFx00003f57@hotmail.com>
Reply-To: assembly-83@lists.ticalc.org

> What is the point of wasting 5 bytes of memory, in a direct LCD program,
by
> writing your own lcd_busy subroutine, when it is already in ROM?  TI has

I guess it's because a call/bcall is (relatively) extremely slow.

> documented it's own ROM call _lcd_busy, but if that's not good enough for
> us, we can call $07DE and it is exactly the same thing, cycle per cycle,
> byte per byte, as: push af, inc hl, dec hl, pop af, ret...
>
> Jeff

Groeten,
Ronald Teune
--
The reasonable man adapts himself to
the world; the unreasonable tries to
adapt the world to himself. Therefore
all progress depends on the
unreasonable man.

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