Re: A83: Flags
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Re: A83: Flags
Yeah, it helps some, but what dso HC, N, S, and the overflow part of the
P flag do? Is the flags register #6?
Thanks,
Alan
>
>Here you go:
>----------+------+--------------------------------------------
> S S Sign flag (Bit 7)
> Z Z Zero flag (Bit 6)
> HC H Half Carry flag (Bit 4)
> P/V P Parity/Overflow flag (Bit 2, V=overflow)
> N N Add/Subtract flag (Bit 1)
> CY C Carry flag (Bit 0)
>
>Does that help?
>
>James Matthews (matthews@tkb.att.ne.jp)
>
>ICQ: 7413754
>http://home.att.ne.jp/gold/tomcat21/index.html
>http://library.advanced.org/18242/
>
>----------
>> From: Alan C Johnson <benjamin99@juno.com>
>> To: assembly-83@lists.ticalc.org
>> Subject: Re: A83: Flags
>> Date: Saturday, September 26, 1998 3:20 AM
>>
>>
>> I haven't seen anything on the flags there.
>>
>> >
>> >Alan C Johnson wrote:
>> >>
>> >> What are all of the Z80's flags?
>> >>
>> >
>> >read some z80 specifications..
>> >
>> >In general they are bits set and cleared according to the result of
>
>> >an
>> >instruction
>> >Z, the zero flag is for example set if the result of for example a
>
>> >sub
>> >instruction is zero.
>> >
>> >You use them mainly in conditional jumps
>> >
>> >To see exactly all flags that exist, and when they are set and
>> >cleared,
>> >check the instructions listings for the z80, for example them that
>is
>> >available at ticalc.com, those are the ones I use..
>> >
>> >
>> >//Olle
>> >
>>
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