From: gameblabla <gameblabla@openmailbox.org>
Date: Sun, 21 Jul 2019 03:39:55 +0000 (+0200)
Subject: psxbios: Some games read from address 0, fix that.
X-Git-Tag: r23~156^2~5
X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bf643fd9c59939266ee95021292a08b5d20a250e;hp=bf643fd9c59939266ee95021292a08b5d20a250e;p=pcsx_rearmed.git

psxbios: Some games read from address 0, fix that.

See Garbage Area at Address 00000000h in Nocash PSX Specifications for more inf>

R-types will refuse to boot if psxM[0] is zero.
Fade to Black can crash upon memory card access if psxM[5] is set to the wrong >
Crash Team Racing will refuse to boot if psxM[2] and psxM[3] are not zero.
(Previously, that region of memory would be overwritten above. No explanation why.)

It's set as such according to nocash :
[00000000h]=3C1A0000h  ;<-- but overwritten by 00000003h after soon
[00000004h]=275A0C80h  ;<-- or 275A0C50h (in older BIOS)
[00000008h]=03400008h
[0000000Ch]=00000000h

Note that setting 00000000h to 00000003h doesn't work for R-types.
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