Re: A86: More beginner questions

To: assembly-86@lists.ticalc.org
Subject: Re: A86: More beginner questions
From: Dux Gregis <assets@eden.rutgers.edu>
Date: Tue, 12 May 1998 20:14:22 -0400
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
References: <2e403875.3558e38e@aol.com>
Reply-To: assembly-86@lists.ticalc.org


You misunderstood me.  It is a register, but the only way to access it
is by <push af> <pop hl>.

BIOSERRORS wrote:
> 
> In a message dated 5/12/98 6:56:51 PM Central Daylight Time,
> assets@eden.rutgers.edu writes:
> 
> > af isn't a valid register
> 
> F is the Flag register.  (Its 8 bits are the different flags)  It CAN be used
> like a normal register though.
> 
> OOO!  I was just thinking:  Is it possible to just say ld f,0 to reset ALL
> flags?
> 
> The Flags register (register F)
> 
> According to Assembly Studio 86:
> 
> The bits of the F register indicate the following:
> 
> Bit 0   C       Carry flag – this flag is set if the previous addition or subtraction
> instruction                     generated a carry/borrow.
> Bit 1   N       Add/Subtract flag – set if previous operation was a subtraction.
> Bit 2   P/V     Parity/Overflow flag
> Bit 3   --      Not used
> Bit 4   H       Half-carry flag
> Bit 5   --      Not used
> Bit 6   Z       Zero flag – set if previous instruction evaluated to zero.
> Bit 7   S       Sign flag – set if previous instruction produced a negative value.

References:

Re: A86: More beginner questions

From: BIOSERRORS <BIOSERRORS@aol.com>

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