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#include "../copyright"
#include <string.h>
#include "memmap.h"
#include "obc1.h"
static uint8_t* OBC1_RAM = NULL;
int OBC1_Address;
int OBC1_BasePtr;
int OBC1_Shift;
uint8_t GetOBC1(uint16_t Address)
{
switch (Address)
{
case 0x7ff0:
return OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2)];
case 0x7ff1:
return OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2) + 1];
case 0x7ff2:
return OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2) + 2];
case 0x7ff3:
return OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2) + 3];
case 0x7ff4:
return OBC1_RAM[OBC1_BasePtr + (OBC1_Address >> 2) + 0x200];
}
return OBC1_RAM[Address & 0x1fff];
}
void SetOBC1(uint8_t Byte, uint16_t Address)
{
switch (Address)
{
case 0x7ff0:
{
OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2)] = Byte;
break;
}
case 0x7ff1:
{
OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2) + 1] = Byte;
break;
}
case 0x7ff2:
{
OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2) + 2] = Byte;
break;
}
case 0x7ff3:
{
OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2) + 3] = Byte;
break;
}
case 0x7ff4:
{
unsigned char Temp;
Temp = OBC1_RAM[OBC1_BasePtr + (OBC1_Address >> 2) + 0x200];
Temp = (Temp & ~(3 << OBC1_Shift)) | ((Byte & 3) << OBC1_Shift);
OBC1_RAM[OBC1_BasePtr + (OBC1_Address >> 2) + 0x200] = Temp;
break;
}
case 0x7ff5:
{
if (Byte & 1)
OBC1_BasePtr = 0x1800;
else
OBC1_BasePtr = 0x1c00;
OBC1_RAM[0x1ff5] = Byte;
break;
}
case 0x7ff6:
{
OBC1_Address = Byte & 0x7f;
OBC1_Shift = (Byte & 3) << 1;
break;
}
default:
OBC1_RAM[Address & 0x1fff] = Byte;
break;
}
}
uint8_t* GetBasePointerOBC1(uint32_t Address)
{
return Memory.FillRAM;
}
uint8_t* GetMemPointerOBC1(uint32_t Address)
{
return (Memory.FillRAM + (Address & 0xffff));
}
void ResetOBC1()
{
OBC1_Address = 0;
OBC1_BasePtr = 0x1c00;
OBC1_Shift = 0;
OBC1_RAM = &Memory.FillRAM[0x6000];
memset(OBC1_RAM, 0x00, 0x2000);
}
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