libsidplayfp::MOS6510 Class Reference

#include <mos6510.h>

Inheritance diagram for libsidplayfp::MOS6510:

Classes
class	haltInstruction

Public Member Functions
void	reset ()
void	debug (bool enable, FILE *out)
void	setRDY (bool newRDY)
void	triggerRST ()
void	triggerNMI ()
void	triggerIRQ ()
void	clearIRQ ()

Static Public Member Functions
static const char *	credits ()

Static Public Attributes
static const int	SR_INTERRUPT = 2
	Status register interrupt bit.

Protected Member Functions
	MOS6510 (EventScheduler &scheduler)
virtual uint8_t	cpuRead (uint_least16_t addr)=0
virtual void	cpuWrite (uint_least16_t addr, uint8_t data)=0

Detailed Description

Cycle-exact 6502/6510 emulation core.

Code is based on work by Simon A. White sidpl.nosp@m.ay2@.nosp@m.yahoo.nosp@m..com. Original Java port by Ken Händel. Later on, it has been hacked to improve compatibility with Lorenz suite on VICE's test suite.

Author

alankila

Constructor & Destructor Documentation

MOS6510()

libsidplayfp::MOS6510::MOS6510 ( EventScheduler & scheduler )

protected

Create new CPU emu.

Parameters

context

The Event Context

Member Function Documentation

clearIRQ()

void libsidplayfp::MOS6510::clearIRQ

(

)

Inform CPU that IRQ is no longer pulled low.

cpuRead()

virtual uint8_t libsidplayfp::MOS6510::cpuRead ( uint_least16_t addr )

protectedpure virtual

Get data from system environment.

Parameters

address

Returns

data byte CPU requested

Implemented in libsidplayfp::c64cpu.

cpuWrite()

virtual void libsidplayfp::MOS6510::cpuWrite ( uint_least16_t addr, uint8_t data )

protectedpure virtual

Write data to system environment.

Parameters

address
data

Implemented in libsidplayfp::c64cpu.

credits()

const char * libsidplayfp::MOS6510::credits ( )

static

Module Credits.

reset()

void libsidplayfp::MOS6510::reset

(

)

Reset CPU Emulation.

setRDY()

void libsidplayfp::MOS6510::setRDY

(

bool

newRDY

)

Handle bus access signals. When RDY line is asserted, the CPU will pause when executing the next read operation.

Parameters

newRDY

new state for RDY signal

triggerIRQ()

void libsidplayfp::MOS6510::triggerIRQ

(

)

Pull IRQ line low on CPU.

triggerNMI()

void libsidplayfp::MOS6510::triggerNMI

(

)

Trigger NMI interrupt on the CPU. Calling this method flags that CPU must enter the NMI routine at earliest opportunity. There is no way to cancel NMI request once given.

triggerRST()

void libsidplayfp::MOS6510::triggerRST

(

)

This forces the CPU to abort whatever it is doing and immediately enter the RST interrupt handling sequence. The implementation is not compatible: instructions actually get aborted mid-execution. However, there is no possible way to trigger this signal from programs, so it's OK.

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The documentation for this class was generated from the following files:

• mos6510.h
• mos6510.cpp