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[Core/CD] fixed access to Sub-CPU "read-only" communication registers (fixes Round 5 Boss freeze in Streets of Rage / Sega Classics Arcade Collection)

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EkeEke 2016-09-07 23:01:40 +02:00
parent b5c243664d
commit 60bb5edb17
5 changed files with 18 additions and 3 deletions
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3
HISTORY.txt
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@ -33,7 +33,8 @@ Genesis Plus GX 1.7.5 (xx/xx/xxxx) (Eke-Eke)
* fixed incorrect masking of Level 3 (GFX) interrupts (spurious freeze during Japanese BIOS intro)
* fixed H-INT vector handling when using Mode 1
* fixed access to "write-only" communication flags (verified on real hardware by Notaz)
* fixed pending level 1 interrupts when GFX interrupt is disabled (fixes random freezes out of "Batman Returns" option menu)
* fixed access to Sub-CPU "read-only" communication registers (fixes Round 5 Boss freeze in Streets of Rage / Sega Classics Arcade Collection)
* fixed pending level 1 interrupts when GFX interrupt is disabled (fixes random freezes when exiting "Batman Returns" option menu)
* fixed CDD seek command again (Final Fight CD freeze with model 2 BIOS)
* optimized Sub-CPU / Main-CPU synchronization

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builds/genesis_plus_gx_libretro.dll
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18
core/cd_hw/scd.c
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@ -1010,11 +1010,18 @@ static void scd_write_byte(unsigned int address, unsigned int data)
default:
{
/* SUB-CPU communication words */
if ((address & 0xf0) == 0x20)
if ((address & 0x1f0) == 0x20)
{
s68k_poll_sync(1 << ((address - 0x10) & 0x1f));
}
/* MAIN-CPU communication words */
else if ((address & 0x1f0) == 0x10)
{
/* read-only (Sega Classic Arcade Collection) */
return;
}
/* default registers */
if (address & 1)
{
@ -1297,11 +1304,18 @@ static void scd_write_word(unsigned int address, unsigned int data)
default:
{
/* SUB-CPU communication words */
if ((address & 0xf0) == 0x20)
if ((address & 0x1f0) == 0x20)
{
s68k_poll_sync(3 << ((address - 0x10) & 0x1e));
}
/* MAIN-CPU communication words */
else if ((address & 0x1f0) == 0x10)
{
/* read-only (Sega Classic Arcade Collection) */
return;
}
/* default registers */
scd.regs[(address >> 1) & 0xff].w = data;
return;