All zero page instructions implemented. Tests passing.
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Seth J. Morabito committed
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commit
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@@ -158,8 +158,10 @@ public class Cpu implements InstructionTable {
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setArithmeticFlags(a);
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break;
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case 0x06: // ASL - Arithmetic Shift Left - Zero Page
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bus.write(operands[0], asl(bus.read(operands[0])));
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setArithmeticFlags(bus.read(operands[0]));
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j = bus.read(operands[0]);
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k = asl(j);
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bus.write(operands[0], k);
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setArithmeticFlags(k);
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break;
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case 0x07: // n/a
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break;
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@@ -232,9 +234,16 @@ public class Cpu implements InstructionTable {
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setNegativeFlag((k & 0x80) != 0);
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setOverflowFlag((k & 0x40) != 0);
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break;
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case 0x25: // n/a
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case 0x25: // AND - Logical And - Zero Page
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j = bus.read(operands[0]);
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a &= j;
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setArithmeticFlags(a);
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break;
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case 0x26: // n/a
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case 0x26: // ROL - Rotate Left - Zero Page
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j = bus.read(operands[0]);
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k = rol(j);
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bus.write(operands[0], k);
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setArithmeticFlags(k);
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break;
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case 0x27: // n/a
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break;
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@@ -306,9 +315,16 @@ public class Cpu implements InstructionTable {
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break;
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case 0x44: // n/a
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break;
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case 0x45: // n/a
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case 0x45: // EOR - Exclusive OR - Zero Page
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j = bus.read(operands[0]);
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a ^= j;
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setArithmeticFlags(a);
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break;
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case 0x46: // n/a
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case 0x46: // LSR - Logical Shift Right - Zero Page
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j = bus.read(operands[0]);
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k = lsr(j);
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bus.write(operands[0], k);
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setArithmeticFlags(k);
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break;
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case 0x47: // n/a
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break;
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@@ -380,9 +396,19 @@ public class Cpu implements InstructionTable {
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break;
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case 0x64: // n/a
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break;
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case 0x65: // n/a
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case 0x65: // ADC - Add with Carry - Zero Page
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j = bus.read(operands[0]);
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if (decimalModeFlag) {
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a = adcDecimal(a, j);
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} else {
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a = adc(a, j);
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}
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break;
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case 0x66: // n/a
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case 0x66: // ROR - Rotate Right - Zero Page
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j = bus.read(operands[0]);
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k = ror(j);
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bus.write(operands[0], k);
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setArithmeticFlags(k);
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break;
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case 0x67: // n/a
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break;
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@@ -452,11 +478,17 @@ public class Cpu implements InstructionTable {
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break;
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case 0x83: // n/a
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break;
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case 0x84: // n/a
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case 0x84: // STY - Store Y Register - Zero Page
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bus.write(operands[0], y);
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setArithmeticFlags(y);
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break;
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case 0x85: // n/a
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case 0x85: // STA - Store Accumulator - Zero Page
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bus.write(operands[0], a);
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setArithmeticFlags(a);
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break;
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case 0x86: // n/a
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case 0x86: // STX - Store X Register - Zero Page
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bus.write(operands[0], x);
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setArithmeticFlags(x);
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break;
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case 0x87: // n/a
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break;
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@@ -529,11 +561,17 @@ public class Cpu implements InstructionTable {
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break;
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case 0xa3: // n/a
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break;
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case 0xa4: // n/a
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case 0xa4: // LDY - Load Y Register - Zero Page
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y = bus.read(operands[0]);
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setArithmeticFlags(y);
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break;
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case 0xa5: // n/a
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case 0xa5: // LDA - Load Accumulator - Zero Page
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a = bus.read(operands[0]);
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setArithmeticFlags(a);
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break;
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case 0xa6: // n/a
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case 0xa6: // LDA - Load X Register - Zero Page
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x = bus.read(operands[0]);
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setArithmeticFlags(x);
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break;
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case 0xa7: // n/a
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break;
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@@ -596,7 +634,7 @@ public class Cpu implements InstructionTable {
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case 0xbf: // n/a
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break;
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case 0xc0: // CPY - Immediate
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case 0xc0: // CPY - Compare Y Register - Immediate
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cmp(y, operands[0]);
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break;
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case 0xc1: // n/a
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@@ -605,11 +643,17 @@ public class Cpu implements InstructionTable {
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break;
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case 0xc3: // n/a
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break;
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case 0xc4: // n/a
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case 0xc4: // CPY - Compare Y Register - Zero Page
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cmp(y, bus.read(operands[0]));
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break;
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case 0xc5: // n/a
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case 0xc5: // CMP - Compare Accumulator - Zero Page
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cmp(a, bus.read(operands[0]));
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break;
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case 0xc6: // n/a
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case 0xc6: // DEC - Decrement Memory - Zero Page
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j = bus.read(operands[0]);
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k = --j & 0xff;
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bus.write(operands[0], k);
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setArithmeticFlags(k);
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break;
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case 0xc7: // n/a
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break;
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@@ -678,11 +722,22 @@ public class Cpu implements InstructionTable {
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break;
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case 0xe3: // n/a
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break;
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case 0xe4: // n/a
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case 0xe4: // CPX - Compare X Register - Zero Page
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cmp(x, bus.read(operands[0]));
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break;
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case 0xe5: // n/a
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case 0xe5: // SBC - Subtract with Carry (Borrow) - Zero Page
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j = bus.read(operands[0]);
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if (decimalModeFlag) {
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a = sbcDecimal(a, j);
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} else {
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a = sbc(a, j);
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}
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break;
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case 0xe6: // n/a
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case 0xe6: // INC - Increment Memory - Zero Page
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j = bus.read(operands[0]);
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k = ++j & 0xff;
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bus.write(operands[0], k);
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setArithmeticFlags(k);
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break;
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case 0xe7: // n/a
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break;
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@@ -866,6 +921,28 @@ public class Cpu implements InstructionTable {
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setCarryFlag((m & 0x01) != 0);
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return (m >>> 1) & 0xff;
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}
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/**
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* Rotates the given value left by one bit, setting bit 0 to the value
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* of the carry flag, and setting the carry flag to the original value
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* of bit 7.
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*/
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private int rol(int m) {
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int result = ((m << 1) | getCarryBit()) & 0xff;
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setCarryFlag((m & 0x80) != 0);
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return result;
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}
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/**
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* Rotates the given value right by one bit, setting bit 7 to the value
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* of the carry flag, and setting the carry flag to the original value
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* of bit 1.
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*/
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private int ror(int m) {
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int result = ((m >>> 1) | (getCarryBit() << 7)) & 0xff;
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setCarryFlag((m & 0x01) != 0);
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return result;
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}
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/**
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* @return the negative flag
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