aiie/apple/mockingboard.cpp

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#include "mockingboard.h"
#include <string.h>
Mockingboard::Mockingboard()
{
}
Mockingboard::~Mockingboard()
{
}
void Mockingboard::Reset()
{
}
uint8_t Mockingboard::readSwitches(uint8_t s)
{
// There are never any reads to the I/O switches
return 0xFF;
}
void Mockingboard::writeSwitches(uint8_t s, uint8_t v)
{
// There are never any writes to the I/O switches
}
void Mockingboard::loadROM(uint8_t *toWhere)
{
// We don't need a ROM; we're going to work via direct interaction
// with memory 0xC400 - 0xC4FF
}
uint8_t Mockingboard::read(uint16_t address)
{
address &= 0xFF;
if ( (address >= 0x00 &&
address <= 0x0F) ||
(address >= 0x80 &&
address <= 0x8F) ) {
uint8_t idx = (address & 0x80 ? 1 : 0);
return sy6522[idx].read(address & 0x0F);
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}
return 0xFF;
}
void Mockingboard::write(uint16_t address, uint8_t val)
{
address &= 0xFF;
if ( (address >= 0x00 &&
address <= 0x0F) ||
(address >= 0x80 &&
address <= 0x8F) ) {
uint8_t idx = (address & 0x80 ? 1 : 0);
return sy6522[idx].write(address & 0x0F, val);
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}
}
void Mockingboard::update(uint32_t cycles)
{
sy6522[0].update(cycles);
sy6522[1].update(cycles);
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}