Re: LZ: AF', BC', DE', HL' and exx

Subject: Re: LZ: AF', BC', DE', HL' and exx
From: Rob Taylor <rtaylor@rtaylor.u-net.com>
Date: Fri, 26 Jul 1996 20:08:13 +0100
In-Reply-To: <LZ: AF', BC', DE', HL' and exx>

> All the registers with a ' after them are alternate registers...
> 
> exx exchanges BC with BC', DE with DE', and HL with HL'. I havent done too much
> asm yet (just got back from vacation..). To exchange AF with AF' do an
> EX AF,AF'
> to exchange the genereal purpose regs, just do an
> EXX
> 
> hope this helps......
> 
I should also mention that you can only use these registers when you 
have switched interrupts off (di) as the TI-85's interrupt routine 
uses them. NB switching interrupts off will also disable GET_KEY, so 
use with care (you'll have to read the keyboard directly), and don't forget 
to switch them back on again at teh end of the code (ei).


Rob Taylor MAIL - mailto:rtaylor@rtaylor.u-net.com 
           WEB  - http://www.u-net.com/~rtaylor/

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