* Correct implementation of Indirect Indexed and Indexed Indirect addressing modes.
* Unit tests for Indirect Indexed and Indexed Indirect. * Updated copyright dates. * Started moving to JUnit 4.
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Seth Morabito committed
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@@ -192,8 +192,8 @@ public class Cpu implements InstructionTable {
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case 1:
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switch(irAddressMode) {
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case 0: // (Zero Page,X)
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// TODO: UNIT TESTS
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effectiveAddress = bus.read(zpxAddress(args[0]));
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tmp = args[0] + getXRegister();
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effectiveAddress = address(bus.read(tmp), bus.read(tmp + 1));
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effectiveData = bus.read(effectiveAddress);
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break;
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case 1: // Zero Page
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@@ -209,11 +209,12 @@ public class Cpu implements InstructionTable {
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effectiveData = bus.read(effectiveAddress);
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break;
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case 4: // (Zero Page),Y
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// TODO: UNIT TESTS
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effectiveAddress = yAddress(bus.read(args[0]), getYRegister());
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tmp = address(bus.read(args[0]),
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bus.read((args[0]+1)&0xff));
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effectiveAddress = (tmp + getYRegister())&0xffff;
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effectiveData = bus.read(effectiveAddress);
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break;
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case 5: // Zero Page, X
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case 5: // Zero Page,X
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effectiveAddress = zpxAddress(args[0]);
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effectiveData = bus.read(effectiveAddress);
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break;
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@@ -418,14 +419,14 @@ public class Cpu implements InstructionTable {
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/** ASL - Arithmetic Shift Left *****************************************/
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case 0x0a: // ASL - Accumulator
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case 0x0a: // Accumulator
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a = asl(a);
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setArithmeticFlags(a);
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break;
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case 0x06: // ASL - Zero Page
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case 0x0e: // ASL - Absolute
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case 0x16: // ASL - Zero Page,X
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case 0x1e: // ASL - Absolute,X
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case 0x06: // Zero Page
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case 0x0e: // Absolute
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case 0x16: // Zero Page,X
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case 0x1e: // Absolute,X
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tmp = asl(effectiveData);
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bus.write(effectiveAddress, tmp);
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setArithmeticFlags(tmp);
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@@ -457,14 +458,14 @@ public class Cpu implements InstructionTable {
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/** ROL - Rotate Left ***************************************************/
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case 0x2a: // ROL - Accumulator
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case 0x2a: // Accumulator
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a = rol(a);
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setArithmeticFlags(a);
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break;
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case 0x26: // ROL - Zero Page
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case 0x2e: // ROL - Absolute
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case 0x36: // ROL - Zero Page,X
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case 0x3e: // ROL - Absolute,X
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case 0x26: // Zero Page
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case 0x2e: // Absolute
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case 0x36: // Zero Page,X
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case 0x3e: // Absolute,X
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tmp = rol(effectiveData);
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bus.write(effectiveAddress, tmp);
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setArithmeticFlags(tmp);
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@@ -472,28 +473,28 @@ public class Cpu implements InstructionTable {
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/** EOR - Exclusive OR **************************************************/
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case 0x41: // EOR - (Zero Page, X)
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case 0x45: // EOR - Zero Page
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case 0x49: // EOR - Immediate
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case 0x4d: // EOR - Absolute
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case 0x51: // EOR - (Zero Page,Y)
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case 0x55: // EOR - Zero Page,X
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case 0x59: // EOR - Absolute,Y
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case 0x5d: // EOR - Absolute,X
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case 0x41: // (Zero Page,X)
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case 0x45: // Zero Page
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case 0x49: // Immediate
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case 0x4d: // Absolute
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case 0x51: // (Zero Page,Y)
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case 0x55: // Zero Page,X
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case 0x59: // Absolute,Y
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case 0x5d: // Absolute,X
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a ^= effectiveData;
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setArithmeticFlags(a);
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break;
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/** LSR - Logical Shift Right *******************************************/
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case 0x4a: // LSR - Accumulator
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case 0x4a: // Accumulator
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a = lsr(a);
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setArithmeticFlags(a);
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break;
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case 0x46: // LSR - Zero Page
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case 0x4e: // LSR - Absolute
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case 0x56: // LSR - Zero Page,X
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case 0x5e: // LSR - Absolute,X
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case 0x46: // Zero Page
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case 0x4e: // Absolute
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case 0x56: // Zero Page,X
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case 0x5e: // Absolute,X
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tmp = lsr(effectiveData);
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bus.write(effectiveAddress, tmp);
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setArithmeticFlags(tmp);
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@@ -533,7 +534,7 @@ public class Cpu implements InstructionTable {
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/** STA - Store Accumulator *********************************************/
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case 0x81: // (Zero Page, X)
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case 0x81: // (Zero Page,X)
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case 0x85: // Zero Page
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case 0x8d: // Absolute
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case 0x91: // (Zero Page),Y
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@@ -564,11 +565,11 @@ public class Cpu implements InstructionTable {
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/** LDY - Load Y Register ***********************************************/
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case 0xa0: // LDY - Immediate
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case 0xa4: // LDY - Zero Page
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case 0xac: // LDY - Absolute
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case 0xb4: // LDY - Zero Page,X
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case 0xbc: // LDY - Absolute,X
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case 0xa0: // Immediate
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case 0xa4: // Zero Page
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case 0xac: // Absolute
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case 0xb4: // Zero Page,X
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case 0xbc: // Absolute,X
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y = effectiveData;
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setArithmeticFlags(y);
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break;
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@@ -586,7 +587,7 @@ public class Cpu implements InstructionTable {
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/** LDA - Load Accumulator **********************************************/
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case 0xa1: // Zero Page, X)
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case 0xa1: // (Zero Page,X)
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case 0xa5: // Zero Page
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case 0xa9: // Immediate
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case 0xad: // Absolute
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@@ -608,11 +609,11 @@ public class Cpu implements InstructionTable {
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/** CMP - Compare Accumulator *******************************************/
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case 0xc1: // (Zero Page, X)
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case 0xc1: // (Zero Page,X)
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case 0xc5: // Zero Page
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case 0xc9: // #Immediate
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case 0xcd: // Absolute
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case 0xd1: // (Zero Page), Y
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case 0xd1: // (Zero Page),Y
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case 0xd5: // Zero Page,X
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case 0xd9: // Absolute,Y
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case 0xdd: // Absolute,X
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@@ -623,7 +624,7 @@ public class Cpu implements InstructionTable {
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/** DEC - Decrement Memory **********************************************/
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case 0xc6: // Zero Page
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case 0xce: // Absolute
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case 0xd6: // Zero Page, X
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case 0xd6: // Zero Page,X
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case 0xde: // Absolute,X
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tmp = --effectiveData & 0xff;
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bus.write(effectiveAddress, tmp);
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@@ -640,11 +641,11 @@ public class Cpu implements InstructionTable {
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/** SBC - Subtract with Carry (Borrow) **********************************/
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case 0xe1: // (Zero Page, X)
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case 0xe1: // (Zero Page,X)
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case 0xe5: // Zero Page
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case 0xe9: // Immediate
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case 0xed: // Absolute
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case 0xf1: // (Zero Page), Y
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case 0xf1: // (Zero Page),Y
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case 0xf5: // Zero Page,X
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case 0xf9: // Absolute,Y
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case 0xfd: // Absolute,X
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@@ -1255,7 +1256,7 @@ public class Cpu implements InstructionTable {
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* Given two bytes, return an address.
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*/
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int address(int lowByte, int hiByte) {
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return ((hiByte<<8)|lowByte);
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return ((hiByte<<8)|lowByte) & 0xffff;
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}
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/**
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@@ -1313,8 +1314,34 @@ public class Cpu implements InstructionTable {
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case ABS:
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sb.append(String.format(" $%04X", address(op1, op2)));
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break;
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case ABX:
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sb.append(String.format(" $%04X,X", address(op1, op2)));
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break;
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case ABY:
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sb.append(String.format(" $%04X,Y", address(op1, op2)));
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break;
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case IMM:
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sb.append(String.format(" #$%02X", op1));
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break;
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case IND:
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sb.append(String.format(" ($%04X)", address(op1, op2)));
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break;
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case XIN:
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sb.append(String.format(" ($%02X),X", op1));
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break;
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case INY:
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sb.append(String.format(" ($%02X,Y)", op1));
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break;
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case REL:
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case ZPG:
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sb.append(String.format(" $%02X", op1));
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break;
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case ZPX:
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sb.append(String.format(" $%02X,X", op1));
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break;
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case ZPY:
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sb.append(String.format(" $%02X,Y", op1));
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break;
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}
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return sb.toString();
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