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

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


Well, there is a good way of allocating memory under a swapping shell that
Florent came up with. I think he used it in Sqrxz actually.

Joe Wingbermuehle
http://www.usmo.com/~joewing/

-----Original Message-----
From: Linus Akesson <lairfight@softhome.net>
To: Joe Wingbermuehle <assembly-83@lists.ticalc.org>
Date: Sunday, September 13, 1998 11:42 AM
Subject: Re: Sv: Sv: Sv: Sv: A83: Random values


>
>I know there's a reason for it, but I want to be able to trash the program,
>f.ex. by displaying an intro pic, and then using the memory it occupied for
>other stuff. With automatic program writeback, that is impossible.
>
>It would have been allright if TI had decided to have automatic program
>writeback in the first place, but as it is now they implicitly state that
it
>is safe to do what I suggested, and thus sos and others suffer from a big
>flaw in their compatibility.
>
>Linus
>
>On 13-Sep-98, Joe Wingbermuehle wrote:
>
>>It isn't stupid, the programs aren't actually written back you know. They
>>are actually moved and, therefore, the program only exists once in the
>>calculator's memory. This allows the programs to take up almost all the
>>calculators memory and still run.
>
>>Joe Wingbermuehle
>>http://www.usmo.com/~joewing/
>
>>-----Original Message-----
>>From: Linus Akesson <lairfight@softhome.net>
>>To: Thomas Turn Jensen <assembly-83@lists.ticalc.org>
>>Date: Sunday, September 13, 1998 9:17 AM
>>Subject: Re: Sv: Sv: Sv: Sv: A83: Random values
>
>
>>>
>>>I did. But some shells have the feature of writing back the whole program
>>>automatically, which I think is stupid. But anyway, this makes people
>>assuume
>>>that everything they store into variables inside the program memory will
>>be
>>>automatically written back to  the program file, and thus the confusion.
>>>
>>>Linus
>>>
>>>On 12-Sep-98, Thomas Turn Jensen wrote:
>>>
>>>>Oh _thats_ what you mean by writeback. I thought you meant writeback as
in
>>>>storing the value for next time the program is run...
>>>
>>>>-----Oprindelig meddelelse-----
>>>>Fra: Phelan Wolf <phelanwolf@hotmail.com>
>>>>Til: assembly-83@lists.ticalc.org <assembly-83@lists.ticalc.org>
>>>>Dato: 12. september 1998 00:43
>>>>Emne: Re: Sv: Sv: Sv: A83: Random values
>>>
>>>
>>>>>
>>>>>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
>>>>>>MIME-Version: 1.0
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>>>>>> charset="iso-8859-1"
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>>>>>towerguard.unix.edu.sollentuna.se id UAA20933
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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
>>>>>
>>>
>>>
>>>
>
>
>