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From: Lewis_Evans@Playstation.sony.com
Newsgroups: scee.yaroze.beginners
Subject: Re: Memory address selection?
Date: 19 Feb 1998 10:58:13 -0000
Organization: Sony Computer Entertainment Europe - 119.SS5
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From: Lewis_Evans@Playstation.sony.com
To: news@playstation.co.uk


To:       Lewis Evans
cc:
From:     news @ playstation.co.uk
Subject:  Re: Memory address selection?:scee.yaroze.beginners




From: "JohnT" <johnt@nettech.demon.co.uk>
Newsgroups: scee.yaroze.beginners
Subject: Re: Memory address selection?
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>The Yaroze kernal and base library take up the memory
>from 0x80000000 - 0x8008ffff, so Never load anything before
>0x80090000; this is effectively the starting address.
>The top address is 0x801fffff, but the stack grows down from that
>point, so best to leave it some space; hence you can take
>values like 0x801f0000 or 0x801ff000 as the top-most address.
>
So, what you are saying is that the claims in the documentation we got
about
the Net Yaroze is wrong when it states we have 2MB of memory to use!
Because
of the kernel we only get 1.44MB.

As someone else said, on the professional kit all executables are _much_
larger
than Yaroze executables because they must link with libraries; Yaroze
executables
do not contain library functions and variables. The difference is hence
very small.
Further, on almost every machine there are libraries to be linked with,
and hence available program memory is always less than the N Mb quoted
for the machine.

The documentation has a FAQ section in
which is effectively asked "What sort of game can I make in 2MB?" and the
answer is effectively "Anything. Ridge Racer, Tomb Raider etc." I think
that
is very misleading and should be re-written to say 1.44MB instead of 2 and
that those games spool the level data off the CD and do not keep it all in
memory.

Many games do spool off CD; but Ridge Racer does not do so at all, the
entire caper
fits into RAM. This game is undoubtedly realistic for Yaroze, the main
barriers
being graphic artwork and sheer development time.

Also those games were written with a full development kit which may
give the programmer more memory.

The full dev kit does allow you to use 8Mb, it's true; but a game using
over 2 Mb can
only been played by other people with full dev kits, ie a restriction in
your game market
from 20 million machines to a few thousand. Every game that has ever
been published on PlayStation uses only 2Mb, since that's all the console
has.

     Cheers,

          Lewis
JohnT