Author: Christophe Theron
Date: 06:41:33 05/08/01
Go up one level in this thread
On May 08, 2001 at 05:35:52, José de Jesús García Ruvalcaba wrote:
>On May 07, 2001 at 18:49:27, Christophe Theron wrote:
>
>>
>>It is true that you do not have access to flat memory in the Palm. Actually you
>>have, but most of the memory is "protected". That is, you can read it with a
>>normal pointer (pointers can point anywhere in the Palm address space), but you
>>cannot write it directly.
>>
>>This is a very simple and clever system that prevents a buggy program from
>>crashing the entire system and erase your valuable data.
>>
>>If you want to write somewhere in a block you have allocated (I mean outside
>>your data segment), you must ask the system to do it for you. Of course the
>>system will first check if the block you are writting into is one of yours.
>>
>>It is possible to bypass this protection system when you know what you are
>>doing.
>>
>>
>>Let me tell you my version about what Richard has said: he wanted to port an
>>existing version of his programs without changing a line of assembly. Because of
>>the special memory protection scheme of the Palm it was easier for him to pick a
>>program that did not use hash tables. The most advanced of his programs which
>>does not use hash tables is the Roma (1987), so he ported the Roma and just had
>>to write a GUI around it.
>>
>>
>>My way of doing it is different. I have decided that I want only one source code
>>for the PC version, the Palm version, the WinCE&PocketPC version and the Linux
>>version. And that the Palm and WinCE versions would not be downgraded versions
>>of Chess Tiger. So when I find an improvement, all the Tiger engines on all
>>platforms benefit from it.
>>
>
>I have no idea how difficult it would be, but do you plan to port Chess Tiger to
>game consoles like the Playstation 2?
>José.
I'm like you: I have no idea how difficult it would be! :)
I'm almost sure I could port the engine without much trouble (it's all written
in C), but writting the GUI would be another story.
If somebody is willing to write the GUI, then I can provide the engine.
Christophe
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