mirror of
https://github.com/dborth/snes9xgx.git
synced 2024-12-25 18:51:50 +01:00
106 lines
2.4 KiB
C++
106 lines
2.4 KiB
C++
/*****************************************************************************\
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Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
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This file is licensed under the Snes9x License.
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For further information, consult the LICENSE file in the root directory.
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\*****************************************************************************/
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#include "snes9x.h"
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#include "memmap.h"
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uint8 S9xGetOBC1 (uint16 Address)
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{
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switch (Address)
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{
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case 0x7ff0:
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return (Memory.OBC1RAM[OBC1.basePtr + (OBC1.address << 2)]);
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case 0x7ff1:
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return (Memory.OBC1RAM[OBC1.basePtr + (OBC1.address << 2) + 1]);
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case 0x7ff2:
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return (Memory.OBC1RAM[OBC1.basePtr + (OBC1.address << 2) + 2]);
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case 0x7ff3:
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return (Memory.OBC1RAM[OBC1.basePtr + (OBC1.address << 2) + 3]);
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case 0x7ff4:
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return (Memory.OBC1RAM[OBC1.basePtr + (OBC1.address >> 2) + 0x200]);
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}
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return (Memory.OBC1RAM[Address - 0x6000]);
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}
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void S9xSetOBC1 (uint8 Byte, uint16 Address)
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{
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switch (Address)
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{
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case 0x7ff0:
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Memory.OBC1RAM[OBC1.basePtr + (OBC1.address << 2)] = Byte;
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break;
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case 0x7ff1:
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Memory.OBC1RAM[OBC1.basePtr + (OBC1.address << 2) + 1] = Byte;
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break;
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case 0x7ff2:
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Memory.OBC1RAM[OBC1.basePtr + (OBC1.address << 2) + 2] = Byte;
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break;
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case 0x7ff3:
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Memory.OBC1RAM[OBC1.basePtr + (OBC1.address << 2) + 3] = Byte;
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break;
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case 0x7ff4:
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{
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uint8 Temp;
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Temp = Memory.OBC1RAM[OBC1.basePtr + (OBC1.address >> 2) + 0x200];
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Temp = (Temp & ~(3 << OBC1.shift)) | ((Byte & 3) << OBC1.shift);
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Memory.OBC1RAM[OBC1.basePtr + (OBC1.address >> 2) + 0x200] = Temp;
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break;
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}
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case 0x7ff5:
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if (Byte & 1)
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OBC1.basePtr = 0x1800;
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else
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OBC1.basePtr = 0x1c00;
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break;
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case 0x7ff6:
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OBC1.address = Byte & 0x7f;
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OBC1.shift = (Byte & 3) << 1;
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break;
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}
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Memory.OBC1RAM[Address - 0x6000] = Byte;
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}
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void S9xResetOBC1 (void)
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{
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for (int i = 0; i <= 0x1fff; i++)
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Memory.OBC1RAM[i] = 0xff;
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if (Memory.OBC1RAM[0x1ff5] & 1)
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OBC1.basePtr = 0x1800;
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else
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OBC1.basePtr = 0x1c00;
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OBC1.address = Memory.OBC1RAM[0x1ff6] & 0x7f;
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OBC1.shift = (Memory.OBC1RAM[0x1ff6] & 3) << 1;
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}
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uint8 * S9xGetBasePointerOBC1 (uint16 Address)
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{
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if (Address >= 0x7ff0 && Address <= 0x7ff6)
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return (NULL);
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return (Memory.OBC1RAM - 0x6000);
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}
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uint8 * S9xGetMemPointerOBC1 (uint16 Address)
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{
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if (Address >= 0x7ff0 && Address <= 0x7ff6)
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return (NULL);
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return (Memory.OBC1RAM + Address - 0x6000);
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}
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