[A83] Re: Rotate 16 bits?

To: assembly-83@lists.ticalc.org
Subject: [A83] Re: Rotate 16 bits?
From: "Aaron St.John" <aaronstj@hotmail.com>
Date: Thu, 01 May 2003 17:26:38 -0700
Reply-To: assembly-83@lists.ticalc.org

>Is there an instruction to rotate a sixteen-bit register, or do I have to 
>do something like rotate the low byte and high byte seperately, and then 
>increment the high byte if the low byte produced a carry? (rotating left)

You are correct sir (your second guess, that is).  Here's the best I can do 
off the top of my head.

     ;rotate HL 1 bit to the left
     SLA H
     RL  L
     JP  C, .skip
     L
.skip

>Along the same lines, is the ADC instruction the same as the x86, where you 
>add if carry, or is it different?

ADC will add the operand and the carry bit to the accumulator.

Stupid like a fox!
Look ma, I'm an artist: http://aaronstj.deviantart.com



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Follow-Ups:

[A83] Re: Rotate 16 bits?

From: Gavin Olson <gtolson@comcast.net>