Mapper 256: Add register scrambling based on NES 2.0 submapper.

src/boards/onebus.c

@@ -27,6 +27,8 @@
 
 #include "mapinc.h"
 
+static uint8 submapper;
+
 /* General Purpose Registers */
 static uint8 cpu410x[16], ppu201x[16], apu40xx[64];
 
@@ -35,9 +37,6 @@ static uint8 IRQCount, IRQa, IRQReload;
 #define IRQLatch cpu410x[0x1]	/* accc cccc, a = 0, AD12 switching, a = 1, HSYNC switching */
 
 /* MMC3 Registers */
-static uint8 inv_hack = 0;		/* some OneBus Systems have swapped PRG reg commans in MMC3 inplementation,
-								 * trying to autodetect unusual behavior, due not to add a new mapper.
-								 */
 #define mmc3cmd  cpu410x[0x5]	/* pcv- ----, p - program swap, c - video swap, v - internal VRAM enable */
 #define mirror   cpu410x[0x6]	/* ---- ---m, m = 0 - H, m = 1 - V */
 
@@ -79,8 +78,8 @@ static void PSync(void) {
 	uint8 bank2  = (cpu410x[0xb] & 0x40)?(cpu410x[0x9]):(~1);
 	uint8 bank3  = ~0;
 #endif
-	uint8 bank0 = cpu410x[0x7 ^ inv_hack];
+	uint8 bank0 = cpu410x[0x7];
-	uint8 bank1 = cpu410x[0x8 ^ inv_hack];
+	uint8 bank1 = cpu410x[0x8];
 	uint8 bank2 = (cpu410x[0xb] & 0x40) ? (cpu410x[0x9]) : (~1);
 	uint8 bank3 = ~0;
 
@@ -126,29 +125,91 @@ static void Sync(void) {
 	CSync();
 }
 
+static const uint8 cpuMangle[16][4] = {
+	{ 0, 1, 2, 3 }, 	// Submapper 0: Normal
+	{ 0, 1, 2, 3 }, 	// Submapper 1: Waixing VT03
+	{ 1, 0, 2, 3 }, 	// Submapper 2: Trump Grand
+	{ 0, 1, 2, 3 }, 	// Submapper 3: Zechess
+	{ 0, 1, 2, 3 }, 	// Submapper 4: Qishenglong
+	{ 0, 1, 2, 3 }, 	// Submapper 5: Waixing VT02
+	{ 0, 1, 2, 3 }, 	// Submapper 6: unused so far
+	{ 0, 1, 2, 3 }, 	// Submapper 7: unused so far
+	{ 0, 1, 2, 3 }, 	// Submapper 8: unused so far
+	{ 0, 1, 2, 3 }, 	// Submapper 9: unused so far
+	{ 0, 1, 2, 3 }, 	// Submapper A: unused so far
+	{ 0, 1, 2, 3 }, 	// Submapper B: unused so far
+	{ 0, 1, 2, 3 }, 	// Submapper C: unused so far
+	{ 0, 1, 2, 3 }, 	// Submapper D: Cube Tech (CPU opcode encryption only)
+	{ 0, 1, 2, 3 }, 	// Submapper E: Karaoto (CPU opcode encryption only)
+	{ 0, 1, 2, 3 }  	// Submapper F: Jungletac (CPU opcode encryption only)
+};
 static DECLFW(UNLOneBusWriteCPU410X) {
 /*	FCEU_printf("CPU %04x:%04x\n",A,V); */
-	switch (A & 0xf) {
+	A &=0xF;
+	switch (A) {
 	case 0x1: IRQLatch = V & 0xfe; break;	/* íå ïî äàòàøèòó */
 	case 0x2: IRQReload = 1; break;
 	case 0x3: X6502_IRQEnd(FCEU_IQEXT); IRQa = 0; break;
 	case 0x4: IRQa = 1; break;
 	default:
-		cpu410x[A & 0xf] = V;
+		if (A >=0x7 && A <=0xA) A =0x7 +cpuMangle[submapper][A -0x7];
+		cpu410x[A] = V;
 		Sync();
 	}
 }
 
+static const uint8 ppuMangle[16][6] = {
+	{ 0, 1, 2, 3, 4, 5 }, 	// Submapper 0: Normal
+	{ 1, 0, 5, 4, 3, 2 }, 	// Submapper 1: Waixing VT03
+	{ 0, 1, 2, 3, 4, 5 }, 	// Submapper 2: Trump Grand
+	{ 5, 4, 3, 2, 0, 1 }, 	// Submapper 3: Zechess
+	{ 2, 5, 0, 4, 3, 1 }, 	// Submapper 4: Qishenglong
+	{ 1, 0, 5, 4, 3, 2 }, 	// Submapper 5: Waixing VT02
+	{ 0, 1, 2, 3, 4, 5 }, 	// Submapper 6: unused so far
+	{ 0, 1, 2, 3, 4, 5 }, 	// Submapper 7: unused so far
+	{ 0, 1, 2, 3, 4, 5 }, 	// Submapper 8: unused so far
+	{ 0, 1, 2, 3, 4, 5 }, 	// Submapper 9: unused so far
+	{ 0, 1, 2, 3, 4, 5 }, 	// Submapper A: unused so far
+	{ 0, 1, 2, 3, 4, 5 }, 	// Submapper B: unused so far
+	{ 0, 1, 2, 3, 4, 5 }, 	// Submapper C: unused so far
+	{ 0, 1, 2, 3, 4, 5 }, 	// Submapper D: Cube Tech (CPU opcode encryption only)
+	{ 0, 1, 2, 3, 4, 5 }, 	// Submapper E: Karaoto (CPU opcode encryption only)
+	{ 0, 1, 2, 3, 4, 5 }  	// Submapper F: Jungletac (CPU opcode encryption only)
+};
 static DECLFW(UNLOneBusWritePPU201X) {
 /*	FCEU_printf("PPU %04x:%04x\n",A,V); */
-	ppu201x[A & 0x0f] = V;
+	A &=0x0F;
+	if (A >=2 && A <=7) A =2 +ppuMangle[submapper][A -2];
+	ppu201x[A] = V;
 	Sync();
 }
 
+static const uint8 mmc3Mangle[16][8] = {
+	{ 0, 1, 2, 3, 4, 5, 6, 7 }, 	// Submapper 0: Normal
+	{ 5, 4, 3, 2, 1, 0, 6, 7 }, 	// Submapper 1: Waixing VT03
+	{ 0, 1, 2, 3, 4, 5, 7, 6 }, 	// Submapper 2: Trump Grand
+	{ 0, 1, 2, 3, 4, 5, 6, 7 }, 	// Submapper 3: Zechess
+	{ 0, 1, 2, 3, 4, 5, 6, 7 }, 	// Submapper 4: Qishenglong
+	{ 0, 1, 2, 3, 4, 5, 6, 7 }, 	// Submapper 5: Waixing VT02
+	{ 0, 1, 2, 3, 4, 5, 6, 7 }, 	// Submapper 6: unused so far
+	{ 0, 1, 2, 3, 4, 5, 6, 7 }, 	// Submapper 7: unused so far
+	{ 0, 1, 2, 3, 4, 5, 6, 7 }, 	// Submapper 8: unused so far
+	{ 0, 1, 2, 3, 4, 5, 6, 7 }, 	// Submapper 9: unused so far
+	{ 0, 1, 2, 3, 4, 5, 6, 7 }, 	// Submapper A: unused so far
+	{ 0, 1, 2, 3, 4, 5, 6, 7 }, 	// Submapper B: unused so far
+	{ 0, 1, 2, 3, 4, 5, 6, 7 }, 	// Submapper C: unused so far
+	{ 0, 1, 2, 3, 4, 5, 6, 7 }, 	// Submapper D: Cube Tech (CPU opcode encryption only)
+	{ 0, 1, 2, 3, 4, 5, 6, 7 }, 	// Submapper E: Karaoto (CPU opcode encryption only)
+	{ 0, 1, 2, 3, 4, 5, 6, 7 }  	// Submapper F: Jungletac (CPU opcode encryption only)
+};
 static DECLFW(UNLOneBusWriteMMC3) {
 /*	FCEU_printf("MMC %04x:%04x\n",A,V); */
 	switch (A & 0xe001) {
-	case 0x8000: mmc3cmd = (mmc3cmd & 0x38) | (V & 0xc7); Sync(); break;
+	case 0x8000: 
+		V =V &0xF8 | mmc3Mangle[submapper][V &0x07];
+		mmc3cmd = (mmc3cmd & 0x38) | (V & 0xc7);
+		Sync();
+		break;
 	case 0x8001:
 	{
 		switch (mmc3cmd & 7) {
@@ -301,9 +362,10 @@ void UNLOneBus_Init(CartInfo *info) {
 	info->Reset = UNLOneBusReset;
 	info->Close = UNLOneBus_Close;
 
-	if (((*(uint32*)&(info->MD5)) == 0x305fcdc3) ||	/* PowerJoy Supermax Carts */
+	if (info->iNES2)
-		((*(uint32*)&(info->MD5)) == 0x6abfce8e))
+		submapper =info->submapper;
-		inv_hack = 0xf;
+	else
+		submapper =(((*(uint32*)&(info->MD5)) == 0x305fcdc3) ||	((*(uint32*)&(info->MD5)) == 0x6abfce8e))? 2: 0; /* PowerJoy Supermax Carts */
 
 	GameHBIRQHook = UNLOneBusIRQHook;
 	MapIRQHook = UNLOneBusCpuHook;