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_mmc1.h
+++ b/src/boards/468_mmc1.h
@@ -0,0 +1,70 @@
+#define MMC1_reg regByte
+#define MMC1_shift regByte[4]
+#define MMC1_count regByte[5]
+#define MMC1_filter regByte[6]
+
+static void MMC1_sync () {
+	int AND =prgAND >>1;
+	int OR  =prgOR  >>1 | (mapper &0x01? (MMC1_reg[1] &0x10): (mapperFlags &0x06));
+	if (MMC1_reg[0] &0x8) { /* 16 KiB mode */
+		if (MMC1_reg[0] &0x04) { /* OR logic */
+			setprg16(0x8000, MMC1_reg[3] &AND | OR &~AND);
+			setprg16(0xC000,        0xFF &AND | OR &~AND);
+		} else {                 /* AND logic */
+			setprg16(0x8000,        0x00 &AND | OR &~AND);
+			setprg16(0xC000, MMC1_reg[3] &AND | OR &~AND);
+		}
+	} else
+		setprg32(0x8000, (MMC1_reg[3] &AND | OR &~AND) >>1);
+	
+	AND =mapper &0x01? 0x0F: 0x1F;
+	if (MMC1_reg[0] &0x10) { /* 4 KiB mode */
+		setchr4(0x0000, MMC1_reg[1] &AND);
+		setchr4(0x1000, MMC1_reg[2] &AND);
+	} else                   /* 8 KiB mode */
+		setchr8(MMC1_reg[1] >>1 &(AND >>1));
+
+	switch(MMC1_reg[0] &3) {
+		case 0: setmirror(MI_0); break;
+		case 1: setmirror(MI_1); break;
+		case 2: setmirror(MI_V); break;
+		case 3: setmirror(MI_H); break;
+	}
+}
+
+static DECLFW(MMC1_writeReg) {
+	if (V &0x80) {
+		MMC1_shift =MMC1_count =0;
+		MMC1_reg[0] |=0x0C;
+		sync();
+	} else
+	if (!MMC1_filter) {
+		MMC1_shift |=(V &1) <<MMC1_count++;
+		if (MMC1_count ==5) {
+			MMC1_reg[A >>13 &3] =MMC1_shift;
+			MMC1_count =0;
+			MMC1_shift =0;
+			sync();
+		}
+	}
+	MMC1_filter =2;
+}
+
+static void FP_FASTAPASS(1) MMC1_cpuCycle(int a) {
+	while (a--) if (MMC1_filter) MMC1_filter--;
+}
+
+void MMC1_reset(uint8 clearRegs) {
+	sync =MMC1_sync;
+	MapIRQHook =MMC1_cpuCycle;
+	prgAND =mapperFlags &2? (mapperFlags &8? 0x07: 0x0F): 0x1F;
+	SetWriteHandler(0x8000, 0xFFFF, MMC1_writeReg);
+	if (clearRegs) MMC1_reg[0] =0x0C;
+	sync();
+}
+
+#undef MMC1_reg
+#undef MMC1_shift
+#undef MMC1_count
+#undef MMC1_filter
+