46 lines
1.0 KiB
C
46 lines
1.0 KiB
C
#define CNROM_reg regByte
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static void CNROM_sync () {
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int OR =prgOR >>1;
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if (mapperFlags &2) {
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setprg16(0x8000, CNROM_reg[2] <<1 &0xE | mapperFlags &1 | OR &~0xF);
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setprg16(0xC000, CNROM_reg[2] <<1 &0xE | mapperFlags &1 | OR &~0xF);
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setchr8(CNROM_reg[0] &0x03);
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} else {
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OR >>=1;
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setprg32(0x8000, CNROM_reg[2] &0x7 | OR &~0x7);
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setchr8(CNROM_reg[0] &0x0F);
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}
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if (mapperFlags &8)
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setmirror(mapperFlags &0x04? MI_H: MI_V);
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else
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setmirror(CNROM_reg[1] &0x10? MI_1: MI_0);
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}
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static DECLFW(CNROM_writeReg) {
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switch(A &0xE000) {
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case 0x8000: case 0xA000:
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CNROM_reg[0] =V;
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break;
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case 0xE000:
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CNROM_reg[2] =V;
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break;
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}
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sync();
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}
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static DECLFW(BF9097_writeMirroring) {
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CNROM_reg[1] =V;
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sync();
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}
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void CNROM_BF9097_reset(uint8 clearRegs) { /* This strange mapper is used for both (C)NROM games and FireHawk. What an absurd combination!*/
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sync =CNROM_sync;
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SetWriteHandler(0x8000, 0xFFFF, CNROM_writeReg);
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if (~mapperFlags &8)
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SetWriteHandler(0x9000, 0x9FFF, BF9097_writeMirroring);
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sync();
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}
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#undef CNROM_reg
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