Re: A86: Asm newbie question Part 2


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Re: A86: Asm newbie question Part 2




hmmm its been around for a while, im not sure who actually found it first.
eble? mardell?
-----Original Message-----
From: Andy S Johnson <the_laser@juno.com>
To: assembly-86@lists.ticalc.org <assembly-86@lists.ticalc.org>
Date: Monday, February 02, 1998 11:30 PM
Subject: Re: A86: Asm newbie question Part 2


>
>I was wondering where this call came from.  Everybody seems to know about
>it except me.  Has someone produced a list of rom calls such as this that
>I missed?
>---
>Andy Johnson
>"Change is inevitable...
>     except from vending machines"
>
>On Mon, 02 Feb 1998 01:35:41 -0500 Stephen Hicks <shicks@MindSpring.Com>
>writes:
>>
>>Ok, if you have a number that you just POPed into BC, and you want to
>>display it, then you want to move the value in BC into HL, and zero
>>out A so
>>that AHL is equal to what BC was.  AHL is a 24-bit register pair
>>(somewhat
>>makeshift - the CPU does not directly support it).  In plain assembly,
>>you
>>want to do the following:
>>
>> ld l,c     ;copy the lower byte of BC into HL
>> ld h,b    ;copy the upper byte of BC into HL
>> xor a     ;zero out A.  I'm a little rusty at asm, and not sure if
>>this one
>>is exactly correct...
>> call $4a33   ;display AHL
>
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