Merge pull request #579 from gameblabla/pio_writes_sen_lib

psxmem: Writes to PIO Expansion area have no effect.

diff --git a/libpcsxcore/psxmem.c b/libpcsxcore/psxmem.c
index c2bed4c..7d9f8bf 100644 (file)
--- a/libpcsxcore/psxmem.c
+++ b/libpcsxcore/psxmem.c
@@ -214,7 +214,11 @@ 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;