Add mapper 468

2022-12-30 23:56:50 +01:00
parent 5ca702053e
commit 07284ca4af
17 changed files with 1074 additions and 0 deletions
--- a/src/boards/468_cnrom.h
+++ b/src/boards/468_cnrom.h
@@ -0,0 +1,45 @@
+#define CNROM_reg regByte
+
+static void CNROM_sync () {
+	int OR  =prgOR >>1;
+	if (mapperFlags &2) {
+		setprg16(0x8000, CNROM_reg[2] <<1 &0xE | mapperFlags &1 | OR &~0xF);
+		setprg16(0xC000, CNROM_reg[2] <<1 &0xE | mapperFlags &1 | OR &~0xF);
+		setchr8(CNROM_reg[0] &0x03);
+	} else {
+		OR >>=1;
+		setprg32(0x8000, CNROM_reg[2] &0x7 | OR &~0x7);
+		setchr8(CNROM_reg[0] &0x0F);
+	}
+	if (mapperFlags &8)
+		setmirror(mapperFlags &0x04? MI_H: MI_V);
+	else
+		setmirror(CNROM_reg[1] &0x10? MI_1: MI_0);
+}
+
+static DECLFW(CNROM_writeReg) {
+	switch(A &0xE000) {
+	case 0x8000: case 0xA000:
+		CNROM_reg[0] =V;
+		break;
+	case 0xE000:
+		CNROM_reg[2] =V;
+		break;
+	}
+	sync();
+}
+
+static DECLFW(BF9097_writeMirroring) {
+	CNROM_reg[1] =V;
+	sync();
+}
+
+void CNROM_BF9097_reset(uint8 clearRegs) { /* This strange mapper is used for both (C)NROM games and FireHawk. What an absurd combination!*/
+	sync =CNROM_sync;
+	SetWriteHandler(0x8000, 0xFFFF, CNROM_writeReg);
+	if (~mapperFlags &8)
+		SetWriteHandler(0x9000, 0x9FFF, BF9097_writeMirroring);
+	sync();
+}
+
+#undef CNROM_reg