[新聞] (WIP) MAME - Demon Front WIP
2012.03.22
魔域戰線進入模擬階段了，科科～
Haze got Demon Front working. Legendary!
http://smitdogg.mameworld.info/pics/d1.png
--
Give me all your demons / They don’t scare me now
The IGS027A chips are meant to be scary boxes of hell, and in most
cases they are.
** If used correctly **
I was looking at Demon Front and noticed something odd. Unlike ‘The
Gladiator’ and most of the other later type games the code in the
external ARM rom makes no reference to the internal ROM space. There
are no obvious jumps back to the internal code area anywhere.
So I did a quick mod, wrote some fake ARM code to set up the stack
pointer and then jump straight to the external area, and this happened.
http://www.youtube.com/watch?feature=player_embedded&v=pH_DD-CWERo
Now while I can’t guarantee this is perfectly emulated because it’s
possible the internal ARM code should be setting up some more things
before jumping to the external code it’s still a huge surprise, and
looks like a massive oversight when the game was developed. I guess
the biggest surprise is that it’s taken until now to notice, it’s
literally a 8-word patch.
My only theory is that maybe if this is the first game with an
‘Execute Only’ area IGS wanted to contain all the internal code in
that area to make it more secure, but it has the opposite effect. I
guess I should probe it a bit to see if there is anything interesting
there at all.
http://mamedev.emulab.it/haze/pics2012/dfront_1.png
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來源：http://0rz.tw/hbcOm
and
http://mamedev.emulab.it/haze/
--
ポーラステーション
http://perryt0517.wordpress.com/
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※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 59.115.182.193
※ 編輯: conpo 來自: 59.115.182.193 (03/22 12:48)
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