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https://github.com/ekeeke/Genesis-Plus-GX.git
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[Core/MCD] fixed access to "write-only" communication flags from Main-CPU & SUB-CPU (verified on real hardware by Notaz)
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20dd11e558
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5fbde4e187
@ -703,13 +703,8 @@ static void scd_write_byte(unsigned int address, unsigned int data)
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return;
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}
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case 0x0e: /* MAIN-CPU communication flags, normally read-only (Space Ace, Dragon's Lair) */
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{
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/* ROR8 operation */
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data = (data >> 1) | ((data << 7) & 1);
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}
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case 0x0f: /* SUB-CPU communication flags */
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case 0x0e: /* SUB-CPU communication flags */
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case 0x0f: /* !LWR is ignored (Space Ace, Dragon's Lair) */
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{
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s68k_poll_sync(1<<0x0f);
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scd.regs[0x0f>>1].byte.l = data;
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@ -990,12 +985,12 @@ static void scd_write_word(unsigned int address, unsigned int data)
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return;
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}
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case 0x0e: /* SUB-CPU communication flags */
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case 0x0e: /* CPU Communication flags */
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{
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s68k_poll_sync(1<<0x0f);
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/* MSB is read-only */
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scd.regs[0x0f>>1].byte.l = data;
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/* D8-D15 ignored -> only SUB-CPU flags are updated */
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scd.regs[0x0f>>1].byte.l = data & 0xff;
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return;
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}
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@ -730,13 +730,8 @@ void ctrl_io_write_byte(unsigned int address, unsigned int data)
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return;
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}
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case 0x0f: /* SUB-CPU communication flags, normally read-only (Space Ace, Dragon's Lair) */
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{
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/* ROL8 operation */
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data = (data << 1) | ((data >> 7) & 1);
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}
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case 0x0e: /* MAIN-CPU communication flags */
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case 0x0e: /* MAIN-CPU communication flags */
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case 0x0f: /* !LWR is ignored (Space Ace, Dragon's Lair) */
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{
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m68k_poll_sync(1<<0x0e);
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scd.regs[0x0e>>1].byte.h = data;
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@ -949,12 +944,12 @@ void ctrl_io_write_word(unsigned int address, unsigned int data)
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return;
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}
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case 0x0e: /* MAIN-CPU communication flags */
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case 0x0e: /* CPU communication flags */
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{
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m68k_poll_sync(1<<0x0e);
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/* LSB is read-only (Mortal Kombat) */
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scd.regs[0x0e>>1].byte.h = data;
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/* D8-D15 ignored -> only MAIN-CPU flags are updated (Mortal Kombat) */
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scd.regs[0x0e>>1].byte.h = data & 0xff;
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return;
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}
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