mirror of
https://github.com/TomHarte/CLK.git
synced 2024-07-10 12:29:01 +00:00
101 lines
2.7 KiB
C++
101 lines
2.7 KiB
C++
//
|
||
// Commodore1540.cpp
|
||
// Clock Signal
|
||
//
|
||
// Created by Thomas Harte on 05/07/2016.
|
||
// Copyright © 2016 Thomas Harte. All rights reserved.
|
||
//
|
||
|
||
#include "C1540.hpp"
|
||
#include <string.h>
|
||
|
||
using namespace Commodore::C1540;
|
||
|
||
Machine::Machine()
|
||
{
|
||
// create a serial port and a VIA to run it
|
||
_serialPortVIA.reset(new SerialPortVIA);
|
||
_serialPort.reset(new SerialPort);
|
||
|
||
// attach the serial port to its VIA and vice versa
|
||
_serialPort->set_serial_port_via(_serialPortVIA);
|
||
_serialPortVIA->set_serial_port(_serialPort);
|
||
|
||
// set this instance as the delegate to receive interrupt requests from both VIAs
|
||
_serialPortVIA->set_delegate(this);
|
||
_driveVIA.set_delegate(this);
|
||
}
|
||
|
||
void Machine::set_serial_bus(std::shared_ptr<::Commodore::Serial::Bus> serial_bus)
|
||
{
|
||
Commodore::Serial::AttachPortAndBus(_serialPort, serial_bus);
|
||
}
|
||
|
||
unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uint16_t address, uint8_t *value)
|
||
{
|
||
// if(operation == CPU6502::BusOperation::ReadOpcode && (address >= 0xF556 && address <= 0xF56D)) printf("%04x\n", address);
|
||
// if(operation == CPU6502::BusOperation::ReadOpcode && (address == 0xE887)) printf("A: %02x\n", get_value_of_register(CPU6502::Register::A));
|
||
|
||
/* static bool log = false;
|
||
|
||
if(operation == CPU6502::BusOperation::ReadOpcode)
|
||
{
|
||
log = (address >= 0xE85B && address <= 0xE907) || (address >= 0xE9C9 && address <= 0xEA2D);
|
||
if(log) printf("\n%04x: ", address);
|
||
}
|
||
if(log) printf("[%c %04x] ", isReadOperation(operation) ? 'r' : 'w', address);*/
|
||
|
||
/*
|
||
Memory map (given that I'm unsure yet on any potential mirroring):
|
||
|
||
0x0000–0x07ff RAM
|
||
0x1800–0x180f the serial-port VIA
|
||
0x1c00–0x1c0f the drive VIA
|
||
0xc000–0xffff ROM
|
||
*/
|
||
if(address < 0x800)
|
||
{
|
||
if(isReadOperation(operation))
|
||
*value = _ram[address];
|
||
else
|
||
_ram[address] = *value;
|
||
}
|
||
else if(address >= 0xc000)
|
||
{
|
||
if(isReadOperation(operation))
|
||
*value = _rom[address & 0x3fff];
|
||
}
|
||
else if(address >= 0x1800 && address <= 0x180f)
|
||
{
|
||
if(isReadOperation(operation))
|
||
*value = _serialPortVIA->get_register(address);
|
||
else
|
||
_serialPortVIA->set_register(address, *value);
|
||
}
|
||
else if(address >= 0x1c00 && address <= 0x1c0f)
|
||
{
|
||
if(isReadOperation(operation))
|
||
*value = _driveVIA.get_register(address);
|
||
else
|
||
_driveVIA.set_register(address, *value);
|
||
}
|
||
|
||
_serialPortVIA->run_for_half_cycles(2);
|
||
_driveVIA.run_for_half_cycles(2);
|
||
|
||
return 1;
|
||
}
|
||
|
||
void Machine::set_rom(const uint8_t *rom)
|
||
{
|
||
memcpy(_rom, rom, sizeof(_rom));
|
||
}
|
||
|
||
#pragma mark - 6522 delegate
|
||
|
||
void Machine::mos6522_did_change_interrupt_status(void *mos6522)
|
||
{
|
||
// both VIAs are connected to the IRQ line
|
||
set_irq_line(_serialPortVIA->get_interrupt_line() || _driveVIA.get_interrupt_line());
|
||
}
|