ca.disassembly.invaders
Class Z80

java.lang.Object
  ca.disassembly.invaders.Z80

Direct Known Subclasses:

InvadersMachine

public class Z80
extends java.lang.Object

CPUZ80 emulates a Z80's behaviour Written in 2001 by E.Duijs as a part of JEmu V1.00 + Many programs run ok. + removed generic parsing by big switch/case blocks for better performance + made functions for many instructions and flags + added NMI - IM0 not ok yet (is now always RST 38) - some missing instructions - DAA not ok, probably due to missing/incorrect half-carry updates V1.1 + IM0 now also supports calls to other locations (other than 0x38) + DAA is corrected + Fixed many flagupdates + An interface 'driver' is passed to exec() instead of a class. Makes it more flexible. + Implements interface 'cpu'. - IM0 doesn't support instructions other than calls, but this is no big deal... - still some missing instructions - code needs to be cleaned up - debugger needs to be finished (mainly the opcode tables). - out & in need to be externalized (it's added in interface 'driver' already) V1.2 + Flag calculations are not done in F anymore but all flags are booleans (faster) + 1 Minor bugfix... V1.3 + Added precalculated flag tables for speed. + Removed the boolean representation for flags. + The flag arrays also fixed some issues that were apparently flag related. + Added some missing instructions. - Because of the flag tables, it takes more memory now. V1.4 + Added INI and IND opcodes V1.41 + Removed localization of PC from fetch-decode loop to support protection in for example Scramble. I'll probably remove localization of all registers later. It was a speed optimization, but the result is only a very minor speedup. Also, it makes further optimizations difficult if not impossible. V1.42 + Fixed LD D,HX / LD D,LX / LD D,HY / LD D,LY V1.5 + Restructured fetch/decode/exec loop so that it performs better on Sun JRE (HotSpot didn't compile exec() at all). + Better maintainable + Fixed one index instruction.

Field Summary

int	A
int	A1
int	B
int	B1
int	C
int	C1
int	cycle
int	cycleCounter
int	D
int	D1
int	E
int	E1
int	F
int	F1
int	H
int	H1
int	I
int	I_Vector
boolean	IFF0
boolean	IFF1
int	IM
static int	IM0
static int	IM1
static int	IM2
static int	INTERRUPT_TYPE_FIRQ Interrupt type
static int	INTERRUPT_TYPE_IGNORE Interrupt type
static int	INTERRUPT_TYPE_IRQ Interrupt type
static int	INTERRUPT_TYPE_NMI Interrupt type
boolean	IRQ
int	IX
int	IXYd
int	IY
int	L
int	L1
boolean	NMI
static java.lang.String[]	opc1
static java.lang.String[]	opc2
static java.lang.String[]	opc3
int	PC
static int	PROPERTY_Z80_IRQ_VECTOR Property type
int	R
int	SP
boolean	state_HALT

Constructor Summary

Z80()
Default constructor debugging disabled Use this constructor for use in applets

Method Summary

void	AF(int nn)
void	BC(int nn)
void	DE(int nn)
void	ex_AF_AF() EX AF,AF'
void	exec(int cycles) Execute a number of clock cycles
void	exx() EXX
int	getCycle()
long	getInstruction() returns the currently excecuted instruction
int	getPC() returns the program counter register (PC)
java.lang.String	getTag()
void	HL(int nn)
int	inb(int port, int hi)
void	interrupt(int type, boolean irq)
void	irq() irq request
void	IX(int nn)
void	IY(int nn)
void	nmi() Non-Maskable irq request
void	outb(int port, int value, int status)
int	peekb(int add)
int	peekw(int add)
void	pokeb(int add, int value)
void	pokew(int add, int value)
int	pop()
void	reset() Reset CPU - Only resets the registers
void	setDebug(boolean debug)
void	setProperty(int property, int value)
void	setTag(java.lang.String tag)
void	step()

Methods inherited from class java.lang.Object

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

Field Detail

IM0

public static final int IM0

See Also:

Constant Field Values

IM1

public static final int IM1

See Also:

Constant Field Values

IM2

public static final int IM2

See Also:

Constant Field Values

INTERRUPT_TYPE_IRQ

public static final int INTERRUPT_TYPE_IRQ

Interrupt type

See Also:

Constant Field Values

INTERRUPT_TYPE_NMI

public static final int INTERRUPT_TYPE_NMI

Interrupt type

See Also:

Constant Field Values

INTERRUPT_TYPE_FIRQ

public static final int INTERRUPT_TYPE_FIRQ

Interrupt type

See Also:

Constant Field Values

INTERRUPT_TYPE_IGNORE

public static final int INTERRUPT_TYPE_IGNORE

Interrupt type

See Also:

Constant Field Values

PROPERTY_Z80_IRQ_VECTOR

public static final int PROPERTY_Z80_IRQ_VECTOR

Property type

See Also:

Constant Field Values

A

public int A

F

public int F

B

public int B

C

public int C

D

public int D

E

public int E

H

public int H

L

public int L

I

public int I

R

public int R

A1

public int A1

F1

public int F1

B1

public int B1

C1

public int C1

D1

public int D1

E1

public int E1

H1

public int H1

L1

public int L1

PC

public int PC

SP

public int SP

IX

public int IX

IY

public int IY

IXYd

public int IXYd

state_HALT

public boolean state_HALT

IM

public int IM

IFF0

public boolean IFF0

IFF1

public boolean IFF1

I_Vector

public int I_Vector

IRQ

public boolean IRQ

NMI

public boolean NMI

cycle

public int cycle

cycleCounter

public int cycleCounter

opc1

public static final java.lang.String[] opc1

opc2

public static final java.lang.String[] opc2

opc3

public static final java.lang.String[] opc3

Constructor Detail

Z80

public Z80()

Default constructor debugging disabled Use this constructor for use in applets

Method Detail

setTag

public void setTag(java.lang.String tag)

getTag

public java.lang.String getTag()

getInstruction

public final long getInstruction()

returns the currently excecuted instruction

interrupt

public final void interrupt(int type,
                            boolean irq)

getPC

public final int getPC()

returns the program counter register (PC)

setDebug

public final void setDebug(boolean debug)

setProperty

public final void setProperty(int property,
                              int value)

irq

public final void irq()

irq request

nmi

public final void nmi()

Non-Maskable irq request

reset

public final void reset()

Reset CPU - Only resets the registers

getCycle

public final int getCycle()

step

public void step()

exec

public final void exec(int cycles)

Execute a number of clock cycles

Parameters:

cycles - number of cycles to be excecuted

ex_AF_AF

public final void ex_AF_AF()

EX AF,AF'

exx

public final void exx()

EXX

AF

public final void AF(int nn)

BC

public final void BC(int nn)

DE

public final void DE(int nn)

IX

public final void IX(int nn)

IY

public final void IY(int nn)

HL

public final void HL(int nn)

pop

public final int pop()

outb

public void outb(int port,
                 int value,
                 int status)

inb

public int inb(int port,
               int hi)

peekb

public int peekb(int add)

pokeb

public void pokeb(int add,
                  int value)

peekw

public int peekw(int add)

pokew

public void pokew(int add,
                  int value)