A83: Re:

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A83: Re:


I know plenty about z80 and even about it's clock cycles.  I just don't
know how I can use something to make a delay timer long enough (since I'm
pretty sure djnz's limit is 256).  Beliefve me, I've read every tutorial
I can fin, even the online ZShell school, and TI's documentation.I know
plenty about Z80, I just need a little help.


-----------------------------------------------------------------------------------------------------------------------
Mastermind--benjamin99@juno.com, www.bigfoot.com/~mastermind5
IRC: Master_M
ICQ: 11341114
-Its all about the Benjamins

On Fri, 10 Jul 1998 20:24:06 +0100 Linus Akesson <lairfight@softhome.net>
writes:
>
>Well, first of all you should learn the z80 forwards & backwards, 
>without
>asking us. Then you can come back and ask about the ti-83 system. I'm 
>not
>saying you aren't welcome, but you should find some information on the 
>z80
>_first_, or you'll annoy us all.
>
>Linus
>
>On 10-Jul-98, Jkhum98@aol.com wrote:
>
>>Hey I'm new to this stuff also, but i noticed that your delay loop 
>was a hell
>>of a lot shorter than Alan's... it probably helped him a whole lot, 
>but can
>>you explain to me what "nop" does and why you had to load "b" just 
>before
>>that, and also what the "djnz" does, just give it all to me... im 
>learning
>>little by little, but hey.
>
>
>>Jason Kovacs
>><jkhum98@aol.com>
>
>
>
>>>hahaha :)  that is a great delay routine... here, try this.  There 
>is also
>
>>>one in bounce.asm in the pub/83/asm/source directory of ticalc.org.
>
>>>
>
>>> ld b,20
>
>>>Loop:
>
>>> nop
>
>>> djnz Loop
>
>>>
>
>>>you could also increase the 20.. and you could replace nop with 
>halt.
>
>>>                                                                     
>       
>
>>>       -Ahmed
>
>>>
>
>>>-----Original Message-----
>
>>>From: Alan C Johnson <benjamin99@juno.com>
>
>>>To: assembly-83@lists.ticalc.org <assembly-83@lists.ticalc.org>
>
>>>Date: Thursday, July 09, 1998 9:25 PM
>
>>>
>
>>>
>
>>>>
>
>>>>I'm updating my first ASM progie and I need a little help so I have 
>a few
>
>>>>questions
>
>>>>
>
>>>> 1.  I need an almost 1/2 second delay that doesn't take up much
>
>>>>space.  See my current pathetically inefficient current
>
>>>>delay below.  It takes up most of the program.
>
>>>> 2.  How do you get string input?   (It can be done e.i. Password)
>
>>>> 3.  How do you store string input anywhere accept a user
>
>>>variavble?  (It can be done, also; same example)
>
>>>> 4.  How do you get pixel legnth for a variable legnth string?  (I
>
>>>>don't know if it can be done without too much memory
>
>>>>usage)
>
>>>>
>
>>>>
>
>>>>
>
>>>>My LOOOOOOOOONNNNGGGG delay loop
>
>>>>
>
>>>>KeyDelay: ; This is very inneficient but
>
>>>> call ReadEnter ; it was the only way to get
>
>>>> cp kEnter ; it to a good speed
>
>>>> jp z,exit ;
>
>>>> nop ; This accounts for a lot of
>
>>>> push hl ; space this prog takes up
>
>>>> pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> push hl
>
>>>>pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> push hl
>
>>>>pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> djnz KeyDelay
>
>>>> ld b,250
>
>>>>KeyDelay2:
>
>>>> call ReadEnter
>
>>>> cp kEnter
>
>>>> jp z,exit
>
>>>> nop
>
>>>> push hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> djnz KeyDelay2
>
>>>> ld b,250
>
>>>>KeyDelay3:
>
>>>> call ReadEnter
>
>>>> cp kEnter
>
>>>> jp z,exit
>
>>>> nop
>
>>>> push hl
>
>>>> pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> push hl
>
>>>>pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> djnz KeyDelay3
>
>>>> ld b,250
>
>>>>KeyDelay4:
>
>>>> call ReadEnter
>
>>>> cp kEnter
>
>>>> jp z,exit
>
>>>> nop
>
>>>> push hl
>
>>>> pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>>djnz KeyDelay4
>
>>>> ld b,250
>
>>>> KeyDelay5:
>
>>>> call ReadEnter
>
>>>> cp kEnter
>
>>>> jp z,exit
>
>>>> nop
>
>>>> push hl
>
>>>> pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> djnz KeyDelay5
>
>>>> ld b,250
>
>>>>KeyDelay6:
>
>>>> call ReadEnter
>
>>>> cp kEnter
>
>>>> jp z,exit
>
>>>> nop
>
>>>> push hl
>
>>>> pop hl
>
>>>>push hl
>
>>>> pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> push hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> push hl
>
>>>> pop hl
>
>>>> djnz KeyDelay6
>
>>>>jp Loopstart
>
>>>>
>
>>>>
>
>>>>------------------------------------------------------------------------
>
>>>>Mastermind--benjamin99@juno.com, www.bigfoot.com/~mastermind5
>
>>>>IRC: Master_M
>
>>>>ICQ: 11341114
>
>>>>-Its all about the Benjamins
>
>>>>
>
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>
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>
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>
>>>>
>
>
>
>

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