Sv: A83: Re: Re:

To: <assembly-83@lists.ticalc.org>
Subject: Sv: A83: Re: Re:
From: "Thomas Turn Jensen" <Mukke@get2net.dk>
Date: Wed, 16 Sep 1998 20:47:15 +0200
Delivered-To: assembly-83-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: assembly-83@lists.ticalc.org

hehe ok, didn't think of that one :)

-----Oprindelig meddelelse-----
Fra: Joe Wingbermuehle <joewing@usmo.com>
Til: assembly-83@lists.ticalc.org <assembly-83@lists.ticalc.org>
Dato: 15. september 1998 22:00
Emne: Re: A83: Re: Re:


>
>Actually, ld pc,hl is possible :P
>
>jp (hl)
>
>Joe Wingbermuehle
>http://www.usmo.com/~joewing/
>
>-----Original Message-----
>From: Thomas Turn Jensen <Mukke@get2net.dk>
>To: assembly-83@lists.ticalc.org <assembly-83@lists.ticalc.org>
>Date: Tuesday, September 15, 1998 1:48 PM
>Subject: Sv: A83: Re: Re:
>
>
>>
>>Not that it's very important but couldn't you just have this instead of
>ret:
>>
>>lh hl,(sp)      ; not possible :(
>>dec sp
>>dec sp
>>ld pc,hl        ; not possible
>>
>>Anyways, loading pc isn't possible according to the Tasm80.tab so this is
>quite meaningles.
>>
>>
>>***
>>Thomas Turn Jensen
>>Icq uin => 8128636
>>IRC, Undernet => Mukke
>>***
>>Får computeren dig til at sukke?
>>Så kald da blot på Mukke
>>***
>>
>>
>>-----Oprindelig meddelelse-----
>>Fra: Alan C Johnson <benjamin99@juno.com>
>>Til: assembly-83@lists.ticalc.org <assembly-83@lists.ticalc.org>
>>Dato: 13. september 1998 22:22
>>Emne: Re: A83: Re: Re:
>>
>>
>>>
>>>The stack pointer points to the memory location in the RAM that is used
>>>for the stack.  Now here's a little bit of useless info.  By the way,
>>>does anyone know where thestack memory starts and ends
>>>
>>>Basically, if there was no push command, you would have to do this:
>>>
>>> inc sp ; 2 because the stack locations are 16-bits
>>> inc sp
>>> ld (sp),rr
>>>
>>>Pop would be:
>>> ld rr,(sp)
>>> dec sp
>>> dec sp
>>>
>>>Call would be:
>>> inc sp
>>> inc sp
>>> ld (sp),pc
>>> jp xxxx ; jp actually being ld pc,xxxx
>>>
>>>Ret would basically be:
>>> ld pc,(sp) ; which would actually be impossible, because it would jump
>>>as soon as you
>>> dec sp ; loaded the pc register, so it wouldn't post-decrement the
>>>stack pointer
>>> dec sp
>>>
>>>
>>>>
>>>>Would someone like to explain the stack pointer in more detail?  I
>>>>know
>>>>*roughly* what it does...no, actually I don't :)...
>>>>
>>>>Later,
>>>>
>>>>James Matthews (matthews@tkb.att.ne.jp)
>>>>
>>>>ICQ: 7413754
>>>>http://home.att.ne.jp/gold/tomcat21/index.html
>>>>http://library.advanced.org/18242/
>>>>
>>>>----------
>>>>> From: Scott Dial (Revenant) <homosapian@geocities.com>
>>>>> To: assembly-83@lists.ticalc.org
>>>>> Subject: A83: Re:
>>>>> Date: Sunday, September 13, 1998 9:28 AM
>>>>>
>>>>>
>>>>> Exactly that...
>>>>>
>>>>> sp is a z80 register for the position of stack pointer... so that he
>>>>can
>>>>> return to that exact point later. spbak is defined at the bottom:
>>>>spbak
>>>>> .dw $0000
>>>>>
>>>>> Patrick W Bambrough wrote:
>>>>> >
>>>>> > hey can anyone tell me what this means and if there is an 83
>>>>equivelant??
>>>>> > ld (spbak),sp
>>>>>
>>>>> --
>>>>> Scott Dial
>>>>> revenant_1@hotmail.com
>>>>> ICQ#3608935
>>>>
>>>
>>>_____________________________________________________________________
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>>>Get completely free e-mail from Juno at http://www.juno.com
>>>Or call Juno at (800) 654-JUNO [654-5866]
>>>
>>
>
>