Re: Sv: Sv: Sv: A83: Random values

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Re: Sv: Sv: Sv: A83: Random values


No, it doesn't work with zasmload, which is by far the most commonly used
loader.

Linus

On 12-Sep-98, Alan C Johnson wrote:

>It'll work as long as you squish it.. What good game isn't squished
>anyway?

>On Sat, 12 Sep 1998 10:50:43 +0100 Linus Akesson <lairfight@softhome.net>
>writes:
>>
>>That will only work when the program is run through a shell. Besides, 
>>you
>>can't do ex a,e.
>>
>>Linus
>>
>>On 11-Sep-98, Phelan Wolf wrote:
>>
>>>ok, writeback isn't hard.
>>>make a label at the end of your program, like this:
>>
>>>lastRandom:
>>
>>>and allocate it 1 byte like this:
>>
>>>lastRandom: .db $00
>>
>>>now we have where we place the random number.  We do it like so...
>>
>>>;code getting random number into 'e'
>>>ld hl,lastRandom     ;get ready to copy the random number
>>>ex a,e               ;exchange 'a' and 'e', putting the random number 
>>       
>>
>>>            
>>>;from 'e' into 'a', while not destroying 'a'
>>>ld (hl),a            ;(hl) is the memory location, lastRandom, and 
>>we
>>>                     ;just put the random number into there
>>>ex a,e               ;restore the registors 'a' and 'e' by putting    
>>       
>>
>>>         
>>>;back the origional values
>>
>>>hope this helps, any questions just ask.
>>
>>>-Phelan 'Amen' Wolf
>>
>>
>>>>From owner-assembly-83-outgoing@towerguard.unix.edu.sollentuna.se 
>>Fri 
>>>Sep 11 11:48:46 1998
>>>>Delivered-To: 
>>assembly-83-outgoing@towerguard.unix.edu.sollentuna.se
>>>>Received: by towerguard.unix.edu.sollentuna.se (VMailer, from userid 
>>
>>>507)
>>>>id 44099C60AF; Fri, 11 Sep 1998 20:48:31 +0200 (CEST)
>>>>Message-ID: <000701bdddb4$f98a8ae0$bcc752c3@turn>
>>>>From: "Thomas Turn Jensen" <Mukke@get2net.dk>
>>>>To: <assembly-83@lists.ticalc.org>
>>>>Subject: Sv: Sv: Sv: A83: Random values
>>>>Date: Fri, 11 Sep 1998 20:49:55 +0200
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>>>>
>>>>
>>>>Ah.... That last thing sounds interesting...
>>>>the writing back thing is kinda tricky.. Wouldn't know how to do 
>>that 
>>>yet - and any explanation ppl could get me would still be too 
>>technical 
>>>I'm afraid... but just wait.. maybe next week I'll ask....
>>>>
>>>>Thanks again for the great delay measuring trick.
>>>>
>>>>-----Oprindelig meddelelse-----
>>>>Fra: Linus Akesson <lairfight@softhome.net>
>>>>Til: Thomas Turn Jensen <assembly-83@lists.ticalc.org>
>>>>Dato: 11. september 1998 20:45
>>>>Emne: Re: Sv: Sv: A83: Random values
>>>>
>>>>
>>>>>
>>>>>Yupp. So you can do a writeback to the program, saving the last 
>>random 
>>>number
>>>>>and reading it back as the first random number when the program is 
>>run 
>>>again.
>>>>>Another widely used method is to check how long time the user waits 
>>
>>>before
>>>>>pressing a key. This would involve using your own key loop, instead 
>>of
>>>>>_getkey:ing.
>>>>>
>>>>>Linus
>>>>>
>>>>>On 11-Sep-98, Thomas Turn Jensen wrote:
>>>>>
>>>>>>But if I start with a constant - wouldn't my program just come up 
>>
>>>with the
>>>>>>same random numbers everytime it is run?
>>>>>
>>>>>>This may be a stupid question, but I simply doesn't follow you.. 
>>Care 
>>>to
>>>>>>explain more (plz :-)?
>>>>>
>>>>>>-----Oprindelig meddelelse-----
>>>>>>Fra: Linus Akesson <lairfight@softhome.net>
>>>>>>Til: Thomas Turn Jensen <assembly-83@lists.ticalc.org>
>>>>>>Dato: 11. september 1998 18:30
>>>>>>Emne: Re: Sv: A83: Random values
>>>>>
>>>>>
>>>>>>>
>>>>>>>You don't. Use a constant, or the contents of some register at 
>>>program start
>>>>>>>or whatever. The random routines in the os always start with the 
>>
>>>same
>>>>>number,
>>>>>>>I think it is 0.94 or something the first time you use math->rand 
>>
>>>with new
>>>>>>>batteries.
>>>>>>>
>>>>>>>Linus
>>>>>>>
>>>>>>>On 10-Sep-98, Thomas Turn Jensen wrote:
>>>>>>>
>>>>>>>>Great!....
>>>>>>>>..ehm.. How do I get that Starting random # ?
>>>>>>>
>>>>>>>>-----Oprindelig meddelelse-----
>>>>>>>>Fra: Linus Akesson <lairfight@softhome.net>
>>>>>>>>Til: Thomas Turn Jensen <assembly-83@lists.ticalc.org>
>>>>>>>>Dato: 10. september 1998 21:02
>>>>>>>>Emne: Re: A83: Random values
>>>>>>>
>>>>>>>
>>>>>>>>>
>>>>>>>>>Random algorithms are quite numerous out there... one idea is 
>>to 
>>>take the
>>>>>>>>>previous random number you got, rotate it some, add some, eor 
>>>some, then
>>>>>>try
>>>>>>>>>the program and see if there's a visible pattern. If there is, 
>>
>>>change some
>>>>>>>of
>>>>>>>>>the constants and try again...
>>>>>>>>>
>>>>>>>>>Linus
>>>>>>>>>
>>>>>>>>>On 10-Sep-98, Thomas Turn Jensen wrote:
>>>>>>>>>>I need to get two random values...
>>>>>>>>>>one in the range [0..94] and the other in [1..64] (yes you 
>>guesed 
>>>it -
>>>>>>it's
>>>>>>>>>>for the graph-screen)
>>>>>>>>>
>>>>>>>>>>I've found a function called "_Random" but have no idea what 
>>>parameters
>>>>>it
>>>>>>>>>>takes where - nor what/where the output is...
>>>>>>>>>
>>>>>>>>>>Could someone either explain to me how it works or tell me how 
>>to 
>>>write
>>>>>>>>>>something which results in the above mentined numbers. (If i 
>>get 
>>>a
>>>>>>function
>>>>>>>>>>that results in a random byte thats ok - where I need it, 
>>speed 
>>>isn't
>>>>>>>>>>essential so I can just check it and if not good generate 
>>another 
>>>random
>>>>>>>>>>number)
>>>>>>>>>>In case someone gives me some code, _plz_ explain what it does 
>>as 
>>>I'm
>>>>>more
>>>>>>>>>>interesting in learning how to make it rather than always use 
>>
>>>other
>>>>>>peoples
>>>>>>>>>>code.
>>>>>>>>>
>>>>>>>>>>Thank you.
>>>>>>>>>
>>>>>>>>>>***
>>>>>>>>>>Thomas Turn Jensen
>>>>>>>>>>Icq uin => 8128636
>>>>>>>>>>IRC, Undernet => Mukke
>>>>>>>>>>***
>>>>>>>>>>If your computer gives you trouble
>>>>>>>>>>Call for Mukke on the double
>>>>>>>>>>***
>>>>>>>>>
>>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>
>>
>>>______________________________________________________
>>>Get Your Private, Free Email at http://www.hotmail.com
>>
>>
>>

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