From fa18abb20fe2316f078023ddec6068bafef86014 Mon Sep 17 00:00:00 2001 From: gameblabla Date: Mon, 27 Sep 2021 19:09:52 +0000 Subject: [PATCH] psxmem: Writes to PIO Expansion area have no effect. (#220) This is related to the Tetris with Card Captor fix a while back. However, i forgot to merge this one as well related to writes, even though it was not really necessary to fix that particular game. Co-authored-by: senquack --- libpcsxcore/psxmem.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/libpcsxcore/psxmem.c b/libpcsxcore/psxmem.c index 3caf889b..61b14c65 100644 --- a/libpcsxcore/psxmem.c +++ b/libpcsxcore/psxmem.c @@ -176,7 +176,11 @@ int psxMemInit() { memcpy(psxMemWLUT + 0x8000, psxMemWLUT, 0x80 * sizeof(void *)); memcpy(psxMemWLUT + 0xa000, psxMemWLUT, 0x80 * sizeof(void *)); - psxMemWLUT[0x1f00] = (u8 *)psxP; + // Don't allow writes to PIO Expansion region (psxP) to take effect. + // NOTE: Not sure if this is needed to fix any games but seems wise, + // seeing as some games do read from PIO as part of copy-protection + // check. (See fix in psxMemReset() regarding psxP region reads). + psxMemWLUT[0x1f00] = NULL; psxMemWLUT[0x1f80] = (u8 *)psxH; return 0; -- 2.39.2