jfrace.cpu
Class Z80

java.lang.Object
  |
  +--jfrace.cpu.Intel8080
        |
        +--jfrace.cpu.Z80

All Implemented Interfaces:

AddressSpaceListener, CPU, Hardware

public class Z80

extends Intel8080

Implements an emulation of Zilog's Z80 8-bit processor. All the restrictions of Intel8080 hold also for this Z80 implementation.

Author:

Franz-Josef Elmer

Field Summary

static int	As Index of register A' (accumulator).
static int	Bs Index of register B'.
static int	Cs Index of register C'.
static int	Ds Index of register D'.
static int	Es Index of register E'.
static int	Fs Index of register F' (flags).
static int	Hs Index of register H'.
static int	I Index of register I.
static int	IX Index of register IX.
static int	IY Index of register IY.
static int	Ls Index of register L'.
static int	R Index of register R.
static int	SUB_MASK Mask for the substraction flag.
static int	SUB_POS Bit position of the substraction flag.

Fields inherited from class jfrace.cpu.Intel8080

A, ACI, ADC, ADD, ADD_MASK, ADI, ANA, ANI, as, AUX_CARRY_MASK, AUX_CARRY_POS, B, C, CALL, CARRY_MASK, CARRY_POS, Cc, CMA, CMC, CMP, CONDITION_NAMES, CPI, D, DAA, DAD, DATA_REGISTER_NAMES, DCR, DCX, DI, E, EI, errorDescription, F, H, HLT, IN, INR, INR_MASK, interruptEnabled, INX, Jc, JMP, L, LDA, LDAX, LHLD, LXI, memory, MOV, MVI, NOP, NULL_BYTE, OP_CODE_TYPE, ORA, ORI, OUT, PARITY_MASK, PARITY_POS, PC, PCHL, POP, portBiasAddress, programCounter, PUSH, RAL, RAR, Rc, REGISTER_PAIR_NAMES, REGISTER_PAIR_NAMES2, registers, RET, RLC, ROT_MASK, RRC, RST, SBB, SBI, SHLD, SIGN_MASK, SIGN_POS, SP, SPHL, STA, stackPointer, STAX, STC, SUB, SUI, UDEF, XCHG, XRA, XRI, XTHL, ZERO_MASK, ZERO_POS

Constructor Summary

Z80()

Method Summary

protected void	addToAccu(byte operand, int carry, int flagMask) Add operand and carry bit to accumulator and set the flags.
int	disassemble(java.lang.StringBuffer sb, int address) Return disassemble instruction in standard Zilog Z80 assembler syntax.
protected int	disassembleUDEF(byte opCode, java.lang.StringBuffer sb, int address)
java.lang.String	getName() Return "Zilog Z80".
int	getNumberOfRegisters() Return 22.
Register	getRegister(int index) Return a register.
int	next() Proceed one opcode.
protected boolean	processINRorDCR(byte opCode, int increment) Process INR and DCR commands.
protected boolean	processUDEF(byte opCode) Process an op-code which is undefined for Intel 8080.
void	reset() Reset the CPU.
void	setRegisterValue(int index, int value) Set the value of a register.
protected void	subtractFromAccu(byte operand, int carry, int flagMask) Subtract operand and carry from accumulator and set the flags.
java.lang.String	toString() Show register states like CP/M DDTZ.

Methods inherited from class jfrace.cpu.Intel8080

calculateParityFlag, checkCondition, disassembleByte, disassembleWord, getAddressSpace, getErrorDescription, getNumberOfBits, getPortBiasAddress, getProgramCounter, getRegisterPair, getWord, hardwareMoved, interrupt, popFromStack, processHLT, pushOnStack, readByte, setAccuAndFlags, setAddressSpace, setPortBiasAddress, setRegisterPair, storeByte, supportsDisassembling

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

As

public static final int As

Index of register A' (accumulator).

Fs

public static final int Fs

Index of register F' (flags).

Bs

public static final int Bs

Index of register B'.

Cs

public static final int Cs

Index of register C'.

Ds

public static final int Ds

Index of register D'.

Es

public static final int Es

Index of register E'.

Hs

public static final int Hs

Index of register H'.

Ls

public static final int Ls

Index of register L'.

IX

public static final int IX

Index of register IX.

IY

public static final int IY

Index of register IY.

I

public static final int I

Index of register I.

R

public static final int R

Index of register R.

SUB_POS

public static final int SUB_POS

Bit position of the substraction flag.

SUB_MASK

public static final int SUB_MASK

Mask for the substraction flag.

Constructor Detail

Z80

public Z80()

Method Detail

toString

public java.lang.String toString()

Show register states like CP/M DDTZ.

Overrides:

toString in class Intel8080

getName

public java.lang.String getName()

Return "Zilog Z80".

Overrides:

getName in class Intel8080

getNumberOfRegisters

public int getNumberOfRegisters()

Return 22.

Overrides:

getNumberOfRegisters in class Intel8080

getRegister

public Register getRegister(int index)

Description copied from interface: CPU

Return a register.

Overrides:

getRegister in class Intel8080

Following copied from interface: jfrace.CPU

Parameters:

index - Index of the register.

Returns:

null if no register exists for the given index.

setRegisterValue

public void setRegisterValue(int index,
                             int value)

Description copied from interface: CPU

Set the value of a register.

Overrides:

setRegisterValue in class Intel8080

Following copied from interface: jfrace.CPU

Parameters:

index - Index of the register.

value - New value.

reset

public void reset()

Description copied from class: Intel8080

Reset the CPU. The internal state will be set into a well-defined initial state.

Overrides:

reset in class Intel8080

next

public int next()

Description copied from class: Intel8080

Proceed one opcode.

Overrides:

next in class Intel8080

Following copied from class: jfrace.cpu.Intel8080

Returns:

always 1 excepted in the case of an error.

processINRorDCR

protected boolean processINRorDCR(byte opCode,
                                  int increment)

Description copied from class: Intel8080

Process INR and DCR commands.

Overrides:

processINRorDCR in class Intel8080

addToAccu

protected void addToAccu(byte operand,
                         int carry,
                         int flagMask)

Description copied from class: Intel8080

Add operand and carry bit to accumulator and set the flags.

Overrides:

addToAccu in class Intel8080

subtractFromAccu

protected void subtractFromAccu(byte operand,
                                int carry,
                                int flagMask)

Description copied from class: Intel8080

Subtract operand and carry from accumulator and set the flags.

Overrides:

subtractFromAccu in class Intel8080

processUDEF

protected boolean processUDEF(byte opCode)

Process an op-code which is undefined for Intel 8080.

Overrides:

processUDEF in class Intel8080

disassembleUDEF

protected int disassembleUDEF(byte opCode,
                              java.lang.StringBuffer sb,
                              int address)

Overrides:

disassembleUDEF in class Intel8080

disassemble

public int disassemble(java.lang.StringBuffer sb,
                       int address)

Return disassemble instruction in standard Zilog Z80 assembler syntax.

Overrides:

disassemble in class Intel8080

Following copied from interface: jfrace.CPU

Parameters:

sb - String buffer.

address - Address of op-code.

Returns:

number of addressable units of the op-code at address.