mirror of https://github.com/sethm/symon.git
1135 lines
36 KiB
Java
1135 lines
36 KiB
Java
package com.loomcom.symon;
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import com.loomcom.symon.devices.Memory;
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import com.loomcom.symon.exceptions.MemoryAccessException;
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import junit.framework.TestCase;
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public class CpuZeroPageXModeTest extends TestCase {
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protected Cpu cpu;
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protected Bus bus;
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protected Memory mem;
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protected void setUp() throws Exception {
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this.cpu = new Cpu();
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this.bus = new Bus(0x0000, 0xffff);
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this.mem = new Memory(0x0000, 0xffff);
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bus.addCpu(cpu);
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bus.addDevice(mem);
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// Load the reset vector.
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bus.write(0xfffc, Bus.DEFAULT_LOAD_ADDRESS & 0x00ff);
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bus.write(0xfffd, (Bus.DEFAULT_LOAD_ADDRESS & 0xff00) >>> 8);
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cpu.reset();
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// Assert initial state
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assertEquals(0, cpu.getAccumulator());
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assertEquals(0, cpu.getXRegister());
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assertEquals(0, cpu.getYRegister());
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assertEquals(0x200, cpu.getProgramCounter());
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assertEquals(0xff, cpu.getStackPointer());
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assertEquals(0x24, cpu.getProcessorStatus());
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}
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/*
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* The following opcodes are tested for correctness in this file:
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*
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* ORA - $15
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* ASL - $16
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* AND - $35
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* ROL - $36
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* EOR - $55
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*
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* LSR - $56
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* ADC - $75
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* ROR - $76
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* STY - $94
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* STA - $95
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*
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* LDY - $b4
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* LDA - $b5
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* CMP - $d5
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* DEC - $d6
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* SBC - $f5
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*
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* INC - $f6
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*/
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/* ORA - Logical Inclusive OR - $15 */
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public void test_ORA() throws MemoryAccessException {
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// Set some initial values in zero page.
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bus.write(0x30, 0x00);
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bus.write(0x32, 0x11);
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bus.write(0x34, 0x22);
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bus.write(0x38, 0x44);
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bus.write(0x40, 0x88);
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bus.write(0x02, 0x88);
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// Set offset in X register.
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cpu.setXRegister(0x30);
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bus.loadProgram(0x15, 0x00, // ORA $00,X
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0x15, 0x02, // ORA $02,X
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0x15, 0x04, // ORA $04,X
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0x15, 0x08, // ORA $08,X
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0x15, 0x10, // ORA $10,X
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0xa9, 0x00, // LDA #$00
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0x15, 0xd2); // ORA $d2,X - should wrap around
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cpu.step();
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assertEquals(0x00, cpu.getAccumulator());
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assertTrue(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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cpu.step();
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assertEquals(0x11, cpu.getAccumulator());
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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cpu.step();
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assertEquals(0x33, cpu.getAccumulator());
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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cpu.step();
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assertEquals(0x77, cpu.getAccumulator());
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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cpu.step();
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assertEquals(0xff, cpu.getAccumulator());
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assertFalse(cpu.getZeroFlag());
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assertTrue(cpu.getNegativeFlag());
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// Should wrap around and ORA with value in 0x02
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cpu.step(2);
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assertEquals(0x88, cpu.getAccumulator());
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assertFalse(cpu.getZeroFlag());
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assertTrue(cpu.getNegativeFlag());
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}
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/* ASL - Arithmetic Shift Left - $16 */
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public void test_ASL() throws MemoryAccessException {
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bus.write(0x30, 0x00);
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bus.write(0x31, 0x01);
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bus.write(0x32, 0x02);
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bus.write(0x33, 0x44);
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bus.write(0x34, 0x80);
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bus.write(0x02, 0x01);
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// Set offset in X register.
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cpu.setXRegister(0x30);
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bus.loadProgram(0x16, 0x00, // ASL $00,X
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0x16, 0x01, // ASL $01,X
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0x16, 0x02, // ASL $02,X
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0x16, 0x03, // ASL $03,X
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0x16, 0x04, // ASL $04,X
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0x16, 0xd2); // ASL $d2,X
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cpu.step();
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assertEquals(0x00, bus.read(0x30, true));
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assertTrue(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x02, bus.read(0x31, true));
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x04, bus.read(0x32, true));
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x88, bus.read(0x33, true));
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assertFalse(cpu.getZeroFlag());
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assertTrue(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x00, bus.read(0x34, true));
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assertTrue(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertTrue(cpu.getCarryFlag());
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// Should wrap around, d2 + 30 = 02
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cpu.step();
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assertEquals(0x02, bus.read(0x02, true));
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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}
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/* AND - Logical AND - $35 */
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public void test_AND() throws MemoryAccessException {
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bus.write(0x30, 0x00);
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bus.write(0x31, 0x11);
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bus.write(0x32, 0xff);
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bus.write(0x33, 0x99);
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bus.write(0x34, 0x11);
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bus.write(0x35, 0x0f);
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bus.write(0x02, 0x11);
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// Set offset in X register.
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cpu.setXRegister(0x30);
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bus.loadProgram(0x35, 0x00, // AND $00
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0x35, 0x01, // AND $01,X
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0xa9, 0xaa, // LDA #$aa
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0x35, 0x02, // AND $02,X
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0x35, 0x03, // AND $03
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0x35, 0x04, // AND $04,X
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0xa9, 0xff, // LDA #$ff
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0x35, 0x05, // AND $05,X
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0xa9, 0x01, // LDA #$01
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0x35, 0xd2); // AND $d2,X
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cpu.step();
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assertEquals(0x00, cpu.getAccumulator());
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assertTrue(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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cpu.step();
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assertEquals(0x00, cpu.getAccumulator());
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assertTrue(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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cpu.step(2);
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assertEquals(0xaa, cpu.getAccumulator());
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assertFalse(cpu.getZeroFlag());
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assertTrue(cpu.getNegativeFlag());
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cpu.step();
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assertEquals(0x88, cpu.getAccumulator());
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assertFalse(cpu.getZeroFlag());
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assertTrue(cpu.getNegativeFlag());
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cpu.step();
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assertEquals(0x00, cpu.getAccumulator());
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assertTrue(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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cpu.step(2);
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assertEquals(0x0f, cpu.getAccumulator());
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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cpu.step(2);
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assertEquals(0x01, cpu.getAccumulator());
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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}
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/* ROL - Rotate Shift Left - $36 */
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public void test_ROL() throws MemoryAccessException {
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bus.write(0x70, 0x00);
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bus.write(0x71, 0x01);
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// Set offset in X register
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cpu.setXRegister(0x70);
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bus.loadProgram(0x36, 0x00, // ROL $00,X (m=%00000000, c=0)
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0x36, 0x01, // ROL $01,X (m=%00000010, c=0)
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0x38, // SEC (m=%00000010, c=1)
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0x36, 0x01, // ROL $01,X (m=%00000101, c=0)
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0x36, 0x01, // ROL $01,X (m=%00001010, c=0)
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0x36, 0x01, // ROL $01,X (m=%00010100, c=0)
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0x36, 0x01, // ROL $01,X (m=%00101000, c=0)
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0x36, 0x01, // ROL $01,X (m=%01010000, c=0)
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0x36, 0x01, // ROL $01,X (m=%10100000, c=0)
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0x36, 0x01, // ROL $01,X (m=%01000000, c=1)
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0x36, 0x01); // ROL $01,X (m=%10000001, c=0)
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cpu.step();
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assertEquals(0x00, bus.read(0x70, true));
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assertTrue(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x02, bus.read(0x71, true));
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step(2);
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assertEquals(0x05, bus.read(0x71, true));
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x0a, bus.read(0x71, true));
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x14, bus.read(0x71, true));
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x28, bus.read(0x71, true));
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x50, bus.read(0x71, true));
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0xa0, bus.read(0x71, true));
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assertFalse(cpu.getZeroFlag());
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assertTrue(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x40, bus.read(0x71, true));
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertTrue(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x81, bus.read(0x71, true));
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assertFalse(cpu.getZeroFlag());
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assertTrue(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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}
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/* EOR - Exclusive OR - $55 */
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public void test_EOR() throws MemoryAccessException {
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bus.write(0x40, 0x00);
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bus.write(0x41, 0xff);
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bus.write(0x42, 0x33);
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bus.write(0x43, 0x44);
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cpu.setXRegister(0x30);
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bus.loadProgram(0xa9, 0x88, // LDA #$88
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0x55, 0x10, // EOR $10,X
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0x55, 0x11, // EOR $11,X
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0x55, 0x12, // EOR $12,X
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0x55, 0x13); // EOR $13,X
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cpu.step(2);
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assertEquals(0x88, cpu.getAccumulator());
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assertTrue(cpu.getNegativeFlag());
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assertFalse(cpu.getZeroFlag());
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cpu.step();
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assertEquals(0x77, cpu.getAccumulator());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getZeroFlag());
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cpu.step();
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assertEquals(0x44, cpu.getAccumulator());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getZeroFlag());
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cpu.step();
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assertEquals(0x00, cpu.getAccumulator());
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assertFalse(cpu.getNegativeFlag());
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assertTrue(cpu.getZeroFlag());
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}
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/* LSR - Logical Shift Right - $56 */
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public void test_LSR() throws MemoryAccessException {
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bus.write(0x30, 0x00);
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bus.write(0x31, 0x01);
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bus.write(0x32, 0x02);
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bus.write(0x33, 0x44);
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bus.write(0x34, 0x80);
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bus.write(0x35, 0x02);
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cpu.setXRegister(0x30);
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bus.loadProgram(0x56, 0x00, // LSR $00,X
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0x56, 0x01, // LSR $01,X
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0x56, 0x02, // LSR $02,X
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0x56, 0x03, // LSR $03,X
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0x56, 0x04, // LSR $04,X
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0x38, // SEC
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0x56, 0x05); // LSR $05,X
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cpu.step();
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assertEquals(0x00, bus.read(0x30, true));
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assertTrue(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x00, bus.read(0x31, true));
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assertTrue(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertTrue(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x01, bus.read(0x32, true));
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x22, bus.read(0x33, true));
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x40, bus.read(0x34, true));
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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// Setting Carry should not affect the result.
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cpu.step(2);
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assertEquals(0x01, bus.read(0x35, true));
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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}
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/* ADC - Add with Carry - $75 */
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public void test_ADC() throws MemoryAccessException {
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bus.write(0x40, 0x01);
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bus.write(0x41, 0xff);
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cpu.setXRegister(0x30);
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bus.loadProgram(0xa9, 0x00, // LDA #$00
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0x75, 0x10); // ADC $10,X
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cpu.step(2);
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assertEquals(0x01, cpu.getAccumulator());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getOverflowFlag());
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.reset();
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cpu.setXRegister(0x30);
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bus.loadProgram(0xa9, 0x7f, // LDA #$7f
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0x75, 0x10); // ADC $10,X
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cpu.step(2);
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assertEquals(0x80, cpu.getAccumulator());
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assertTrue(cpu.getNegativeFlag());
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assertTrue(cpu.getOverflowFlag());
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.reset();
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cpu.setXRegister(0x30);
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bus.loadProgram(0xa9, 0x80, // LDA #$80
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0x75, 0x10); // ADC $10,X
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cpu.step(2);
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assertEquals(0x81, cpu.getAccumulator());
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assertTrue(cpu.getNegativeFlag());
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assertFalse(cpu.getOverflowFlag());
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.reset();
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cpu.setXRegister(0x30);
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bus.loadProgram(0xa9, 0xff, // LDA #$ff
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0x75, 0x10); // ADC $10,X
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cpu.step(2);
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assertEquals(0x00, cpu.getAccumulator());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getOverflowFlag());
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assertTrue(cpu.getZeroFlag());
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assertTrue(cpu.getCarryFlag());
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cpu.reset();
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cpu.setXRegister(0x30);
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bus.loadProgram(0xa9, 0x00, // LDA #$00
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0x75, 0x11); // ADC $11,X
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cpu.step(2);
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assertEquals(0xff, cpu.getAccumulator());
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assertTrue(cpu.getNegativeFlag());
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assertFalse(cpu.getOverflowFlag());
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.reset();
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cpu.setXRegister(0x30);
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bus.loadProgram(0xa9, 0x7f, // LDA #$7f
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0x75, 0x11); // ADC $11,X
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cpu.step(2);
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assertEquals(0x7e, cpu.getAccumulator());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getOverflowFlag());
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assertFalse(cpu.getZeroFlag());
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assertTrue(cpu.getCarryFlag());
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cpu.reset();
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cpu.setXRegister(0x30);
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bus.loadProgram(0xa9, 0x80, // LDA #$80
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0x75, 0x11); // ADC $11,X
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cpu.step(2);
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assertEquals(0x7f, cpu.getAccumulator());
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assertFalse(cpu.getNegativeFlag());
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assertTrue(cpu.getOverflowFlag());
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assertFalse(cpu.getZeroFlag());
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assertTrue(cpu.getCarryFlag());
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cpu.reset();
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cpu.setXRegister(0x30);
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bus.loadProgram(0xa9, 0xff, // LDA #$ff
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0x75, 0x11); // ADC $11,X
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cpu.step(2);
|
|
assertEquals(0xfe, cpu.getAccumulator());
|
|
assertTrue(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getCarryFlag());
|
|
}
|
|
|
|
public void test_ADC_IncludesCarry() throws MemoryAccessException {
|
|
bus.write(0x40, 0x01);
|
|
|
|
bus.loadProgram(0xa9, 0x00, // LDA #$00
|
|
0x38, // SEC
|
|
0x75, 0x10); // ADC $10,X
|
|
|
|
cpu.setXRegister(0x30);
|
|
|
|
cpu.step(3);
|
|
assertEquals(0x02, cpu.getAccumulator());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
}
|
|
|
|
public void test_ADC_DecimalMode() throws MemoryAccessException {
|
|
bus.write(0x40, 0x01);
|
|
bus.write(0x41, 0x99);
|
|
|
|
bus.loadProgram(0xf8, // SED
|
|
0xa9, 0x01, // LDA #$01
|
|
0x75, 0x10); // ADC $10,X
|
|
|
|
cpu.setXRegister(0x30);
|
|
|
|
cpu.step(3);
|
|
assertEquals(0x02, cpu.getAccumulator());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
cpu.reset();
|
|
cpu.setXRegister(0x30);
|
|
|
|
bus.loadProgram(0xf8, // SED
|
|
0xa9, 0x49, // LDA #$49
|
|
0x75, 0x10); // ADC $10,X
|
|
cpu.step(3);
|
|
assertEquals(0x50, cpu.getAccumulator());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
cpu.reset();
|
|
cpu.setXRegister(0x30);
|
|
|
|
bus.loadProgram(0xf8, // SED
|
|
0xa9, 0x50, // LDA #$50
|
|
0x75, 0x10); // ADC $10,X
|
|
cpu.step(3);
|
|
assertEquals(0x51, cpu.getAccumulator());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
cpu.reset();
|
|
cpu.setXRegister(0x30);
|
|
|
|
bus.loadProgram(0xf8, // SED
|
|
0xa9, 0x99, // LDA #$99
|
|
0x75, 0x10); // ADC $10,X
|
|
cpu.step(3);
|
|
assertEquals(0x00, cpu.getAccumulator());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertTrue(cpu.getZeroFlag());
|
|
assertTrue(cpu.getCarryFlag());
|
|
|
|
cpu.reset();
|
|
cpu.setXRegister(0x30);
|
|
|
|
bus.loadProgram(0xf8, // SED
|
|
0xa9, 0x00, // LDA #$00
|
|
0x75, 0x11); // ADC $10,X
|
|
cpu.step(3);
|
|
assertEquals(0x99, cpu.getAccumulator());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
cpu.reset();
|
|
cpu.setXRegister(0x30);
|
|
|
|
bus.loadProgram(0xf8, // SED
|
|
0xa9, 0x49, // LDA #$49
|
|
0x75, 0x11); // ADC $11,X
|
|
cpu.step(3);
|
|
assertEquals(0x48, cpu.getAccumulator());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getCarryFlag());
|
|
|
|
cpu.reset();
|
|
cpu.setXRegister(0x30);
|
|
|
|
bus.loadProgram(0xf8, // SED
|
|
0xa9, 0x50, // LDA #$59
|
|
0x75, 0x11); // ADC $11,X
|
|
cpu.step(3);
|
|
assertEquals(0x49, cpu.getAccumulator());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getCarryFlag());
|
|
}
|
|
|
|
/* ROR - Rotate Right - $76 */
|
|
|
|
public void test_ROR() throws MemoryAccessException {
|
|
|
|
bus.write(0x40, 0x00);
|
|
bus.write(0x41, 0x10);
|
|
|
|
bus.loadProgram(0x76, 0x10, // ROR $00 (m=%00000000, c=0)
|
|
0x76, 0x11, // ROR $01 (m=%00001000, c=0)
|
|
0x76, 0x11, // ROR $01 (m=%00000100, c=0)
|
|
0x76, 0x11, // ROR $01 (m=%00000010, c=0)
|
|
0x76, 0x11, // ROR $01 (m=%00000001, c=0)
|
|
0x76, 0x11, // ROR $01 (m=%00000000, c=1)
|
|
0x76, 0x11, // ROR $01 (m=%10000000, c=0)
|
|
0x76, 0x11, // ROR $01 (m=%01000000, c=0)
|
|
0x76, 0x11, // ROR $01 (m=%00100000, c=0)
|
|
0x76, 0x11); // ROR $01 (m=%00010000, c=0)
|
|
|
|
cpu.setXRegister(0x30);
|
|
|
|
cpu.step();
|
|
assertEquals(0x00, bus.read(0x40, true));
|
|
assertTrue(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x08, bus.read(0x41, true));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x04, bus.read(0x41, true));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x02, bus.read(0x41, true));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x01, bus.read(0x41, true));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x00, bus.read(0x41, true));
|
|
assertTrue(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertTrue(cpu.getCarryFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x80, bus.read(0x41, true));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x40, bus.read(0x41, true));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x20, bus.read(0x41, true));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x10, bus.read(0x41, true));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
}
|
|
|
|
/* STY - Store Y Register - $94 */
|
|
|
|
public void test_STY() throws MemoryAccessException {
|
|
cpu.setXRegister(0x30);
|
|
cpu.setYRegister(0x00);
|
|
bus.loadProgram(0x94, 0x10); // STY $10,X
|
|
cpu.step();
|
|
assertEquals(0x00, bus.read(0x40, true));
|
|
// Should have no effect on flags.
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
|
|
cpu.reset();
|
|
|
|
cpu.setXRegister(0x30);
|
|
cpu.setYRegister(0x0f);
|
|
bus.loadProgram(0x94, 0x10); // STY $10,X
|
|
cpu.step();
|
|
assertEquals(0x0f, bus.read(0x40, true));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
|
|
cpu.reset();
|
|
|
|
cpu.setXRegister(0x30);
|
|
cpu.setYRegister(0x80);
|
|
bus.loadProgram(0x94, 0x10); // STY $10,X
|
|
cpu.step();
|
|
assertEquals(0x80, bus.read(0x40, true));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
}
|
|
|
|
/* STA - Store Accumulator - $95 */
|
|
|
|
public void test_STA() throws MemoryAccessException {
|
|
cpu.setXRegister(0x30);
|
|
|
|
cpu.setAccumulator(0x00);
|
|
bus.loadProgram(0x95, 0x10); // STA $10,X
|
|
cpu.step();
|
|
assertEquals(0x00, bus.read(0x40, true));
|
|
// Should have no effect on flags.
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
|
|
cpu.reset();
|
|
cpu.setXRegister(0x30);
|
|
|
|
cpu.setAccumulator(0x0f);
|
|
bus.loadProgram(0x95, 0x10); // STA $10,X
|
|
cpu.step();
|
|
assertEquals(0x0f, bus.read(0x40, true));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
|
|
cpu.reset();
|
|
cpu.setXRegister(0x30);
|
|
|
|
cpu.setAccumulator(0x80);
|
|
bus.loadProgram(0x95, 0x10); // STA $10,X
|
|
cpu.step();
|
|
assertEquals(0x80, bus.read(0x40, true));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
}
|
|
|
|
/* LDY - Load Y Register - $b4 */
|
|
|
|
public void test_LDY() throws MemoryAccessException {
|
|
bus.write(0x45, 0x00);
|
|
bus.write(0x46, 0x0f);
|
|
bus.write(0x47, 0x80);
|
|
|
|
bus.loadProgram(0xb4, 0x10, // LDY $10,X
|
|
0xb4, 0x11, // LDY $11,X
|
|
0xb4, 0x12); // LDY $12,X
|
|
|
|
cpu.setXRegister(0x35);
|
|
|
|
cpu.step();
|
|
assertEquals(0x00, cpu.getYRegister());
|
|
assertTrue(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x0f, cpu.getYRegister());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x80, cpu.getYRegister());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getNegativeFlag());
|
|
}
|
|
|
|
/* LDA - Load Accumulator - $b5 */
|
|
|
|
public void test_LDA() throws MemoryAccessException {
|
|
bus.write(0x42, 0x00);
|
|
bus.write(0x43, 0x0f);
|
|
bus.write(0x44, 0x80);
|
|
|
|
bus.loadProgram(0xb5, 0x10, // LDA $10,X
|
|
0xb5, 0x11, // LDA $11,X
|
|
0xb5, 0x12); // LDA $12,X
|
|
|
|
cpu.setXRegister(0x32);
|
|
|
|
cpu.step();
|
|
assertEquals(0x00, cpu.getAccumulator());
|
|
assertTrue(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x0f, cpu.getAccumulator());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x80, cpu.getAccumulator());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getNegativeFlag());
|
|
}
|
|
|
|
/* CMP - Compare Accumulator - $d5 */
|
|
|
|
public void test_CMP() throws MemoryAccessException {
|
|
bus.write(0x40, 0x00);
|
|
bus.write(0x41, 0x80);
|
|
bus.write(0x42, 0xff);
|
|
|
|
cpu.setAccumulator(0x80);
|
|
|
|
bus.loadProgram(0xd5, 0x10,
|
|
0xd5, 0x11,
|
|
0xd5, 0x12);
|
|
|
|
cpu.setXRegister(0x30);
|
|
|
|
cpu.step();
|
|
assertTrue(cpu.getCarryFlag()); // m > y
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getNegativeFlag()); // m - y < 0
|
|
|
|
cpu.step();
|
|
assertTrue(cpu.getCarryFlag()); // m = y
|
|
assertTrue(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag()); // m - y == 0
|
|
|
|
cpu.step();
|
|
assertFalse(cpu.getCarryFlag()); // m < y
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getNegativeFlag()); // m - y < 0
|
|
}
|
|
|
|
/* DEC - Decrement Memory Location - $d6 */
|
|
|
|
public void test_DEC() throws MemoryAccessException {
|
|
bus.write(0x40, 0x00);
|
|
bus.write(0x41, 0x01);
|
|
bus.write(0x42, 0x80);
|
|
bus.write(0x43, 0xff);
|
|
|
|
bus.loadProgram(0xd6, 0x10, // DEC $10,X
|
|
0xd6, 0x11, // DEC $11,X
|
|
0xd6, 0x12, // DEC $12,X
|
|
0xd6, 0x13); // DEC $13,X
|
|
|
|
cpu.setXRegister(0x30);
|
|
|
|
cpu.step();
|
|
assertEquals(0xff, bus.read(0x40, true));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getNegativeFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x00, bus.read(0x41, true));
|
|
assertTrue(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x7f, bus.read(0x42, true));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0xfe, bus.read(0x43, true));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getNegativeFlag());
|
|
}
|
|
|
|
/* SBC - Subtract with Carry - $f5 */
|
|
|
|
public void test_SBC() throws MemoryAccessException {
|
|
bus.write(0x40, 0x01);
|
|
|
|
bus.loadProgram(0xa9, 0x00, // LDA #$00
|
|
0xf5, 0x10); // SBC $10,X
|
|
cpu.setXRegister(0x30);
|
|
cpu.step(2);
|
|
assertEquals(0xfe, cpu.getAccumulator());
|
|
assertTrue(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
cpu.reset();
|
|
bus.loadProgram(0xa9, 0x7f, // LDA #$7f
|
|
0xf5, 0x10); // SBC $10,X
|
|
cpu.setXRegister(0x30);
|
|
cpu.step(2);
|
|
assertEquals(0x7d, cpu.getAccumulator());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getCarryFlag());
|
|
|
|
cpu.reset();
|
|
bus.loadProgram(0xa9, 0x80, // LDA #$80
|
|
0xf5, 0x10); // SBC $10,X
|
|
cpu.setXRegister(0x30);
|
|
cpu.step(2);
|
|
assertEquals(0x7e, cpu.getAccumulator());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertTrue(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getCarryFlag());
|
|
|
|
cpu.reset();
|
|
bus.loadProgram(0xa9, 0xff, // LDA #$ff
|
|
0xf5, 0x10); // SBC $10,X
|
|
cpu.setXRegister(0x30);
|
|
cpu.step(2);
|
|
assertEquals(0xfd, cpu.getAccumulator());
|
|
assertTrue(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getCarryFlag());
|
|
|
|
cpu.reset();
|
|
bus.loadProgram(0xa9, 0x02, // LDA #$02
|
|
0xf5, 0x10); // SBC $10,X
|
|
cpu.setXRegister(0x30);
|
|
cpu.step(2);
|
|
assertEquals(0x00, cpu.getAccumulator());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertTrue(cpu.getZeroFlag());
|
|
assertTrue(cpu.getCarryFlag());
|
|
}
|
|
|
|
public void test_SBC_IncludesNotOfCarry() throws MemoryAccessException {
|
|
bus.write(0x40, 0x01);
|
|
|
|
// Subtrace with Carry Flag cleared
|
|
bus.loadProgram(0x18, // CLC
|
|
0xa9, 0x05, // LDA #$00
|
|
0xf5, 0x10); // SBC $10,X
|
|
cpu.setXRegister(0x30);
|
|
cpu.step(3);
|
|
assertEquals(0x03, cpu.getAccumulator());
|
|
|
|
cpu.reset();
|
|
|
|
// Subtrace with Carry Flag cleared
|
|
bus.loadProgram(0x18, // CLC
|
|
0xa9, 0x00, // LDA #$00
|
|
0xf5, 0x10); // SBC $10,X
|
|
cpu.setXRegister(0x30);
|
|
cpu.step(3);
|
|
assertEquals(0xfe, cpu.getAccumulator());
|
|
|
|
cpu.reset();
|
|
|
|
// Subtract with Carry Flag set
|
|
bus.loadProgram(0x38, // SEC
|
|
0xa9, 0x05, // LDA #$00
|
|
0xf5, 0x10); // SBC $10,X
|
|
cpu.setXRegister(0x30);
|
|
cpu.step(3);
|
|
assertEquals(0x04, cpu.getAccumulator());
|
|
assertTrue(cpu.getCarryFlag());
|
|
|
|
cpu.reset();
|
|
|
|
// Subtract with Carry Flag set
|
|
bus.loadProgram(0x38, // SEC
|
|
0xa9, 0x00, // LDA #$00
|
|
0xf5, 0x10); // SBC $10,X
|
|
cpu.setXRegister(0x30);
|
|
cpu.step(3);
|
|
assertEquals(0xff, cpu.getAccumulator());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
}
|
|
|
|
public void test_SBC_DecimalMode() throws MemoryAccessException {
|
|
bus.write(0x40, 0x01);
|
|
bus.write(0x50, 0x11);
|
|
|
|
bus.loadProgram(0xf8,
|
|
0xa9, 0x00,
|
|
0xf5, 0x10);
|
|
cpu.setXRegister(0x30);
|
|
cpu.step(3);
|
|
assertEquals(0x98, cpu.getAccumulator());
|
|
assertFalse(cpu.getCarryFlag()); // borrow = set flag
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getDecimalModeFlag());
|
|
|
|
cpu.reset();
|
|
|
|
bus.loadProgram(0xf8,
|
|
0xa9, 0x99,
|
|
0xf5, 0x10);
|
|
cpu.setXRegister(0x30);
|
|
cpu.step(3);
|
|
assertEquals(0x97, cpu.getAccumulator());
|
|
assertTrue(cpu.getCarryFlag()); // No borrow = clear flag
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getDecimalModeFlag());
|
|
|
|
cpu.reset();
|
|
|
|
bus.loadProgram(0xf8,
|
|
0xa9, 0x50,
|
|
0xf5, 0x10);
|
|
cpu.setXRegister(0x30);
|
|
cpu.step(3);
|
|
assertEquals(0x48, cpu.getAccumulator());
|
|
assertTrue(cpu.getCarryFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getDecimalModeFlag());
|
|
|
|
|
|
cpu.reset();
|
|
|
|
bus.loadProgram(0xf8, // SED
|
|
0xa9, 0x02, // LDA #$02
|
|
0xf5, 0x10); // SBC $10
|
|
cpu.setXRegister(0x30);
|
|
cpu.step(3);
|
|
assertEquals(0x00, cpu.getAccumulator());
|
|
assertTrue(cpu.getCarryFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertTrue(cpu.getZeroFlag());
|
|
assertTrue(cpu.getDecimalModeFlag());
|
|
|
|
cpu.reset();
|
|
|
|
bus.loadProgram(0xf8, // SED
|
|
0xa9, 0x10, // LDA #$10
|
|
0xf5, 0x20); // SBC $20
|
|
cpu.setXRegister(0x30);
|
|
cpu.step(3);
|
|
assertEquals(0x98, cpu.getAccumulator());
|
|
assertFalse(cpu.getCarryFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getDecimalModeFlag());
|
|
|
|
cpu.reset();
|
|
|
|
bus.loadProgram(0x38, // SEC
|
|
0xf8, // SED
|
|
0xa9, 0x05, // LDA #$05
|
|
0xf5, 0x10); // SBC $10
|
|
cpu.setXRegister(0x30);
|
|
cpu.step(4);
|
|
assertEquals(0x04, cpu.getAccumulator());
|
|
assertTrue(cpu.getCarryFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getDecimalModeFlag());
|
|
|
|
cpu.reset();
|
|
|
|
bus.loadProgram(0x38, // SEC
|
|
0xf8, // SED
|
|
0xa9, 0x00, // LDA #$00
|
|
0xf5, 0x10); // SBC $10
|
|
cpu.setXRegister(0x30);
|
|
cpu.step(4);
|
|
assertEquals(0x99, cpu.getAccumulator());
|
|
assertFalse(cpu.getCarryFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getDecimalModeFlag());
|
|
}
|
|
|
|
/* INC - Increment Memory Location - $f6 */
|
|
|
|
public void test_INC() throws MemoryAccessException {
|
|
bus.write(0x30, 0x00);
|
|
bus.write(0x31, 0x7f);
|
|
bus.write(0x32, 0xff);
|
|
|
|
cpu.setXRegister(0x20);
|
|
|
|
bus.loadProgram(0xf6, 0x10, // INC $10,X
|
|
0xf6, 0x11, // INC $11,X
|
|
0xf6, 0x12); // INC $12,X
|
|
|
|
cpu.step();
|
|
assertEquals(0x01, bus.read(0x30, true));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x80, bus.read(0x31, true));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getNegativeFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x00, bus.read(0x32, true));
|
|
assertTrue(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
}
|
|
|
|
}
|