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Sought to reintroduce the Atari 8k paging scheme, at the same time deciding to do away with the copy and paste of holding on to ROM data.

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This commit is contained in:
Thomas Harte 2017-03-18 15:04:01 -04:00
parent 36b58d03b7
commit bb3daaa99b
6 changed files with 89 additions and 7 deletions
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10
Machines/Atari2600/Atari2600.cpp
View File

@ -11,7 +11,8 @@
#include <stdio.h>
#include "CartridgeUnpaged.hpp"
#include "CartridgeCommaVid.h"
#include "CartridgeCommaVid.hpp"
#include "CartridgeAtari8k.hpp"
using namespace Atari2600;
namespace {
@ -80,6 +81,13 @@ void Machine::configure_as_target(const StaticAnalyser::Target &target) {
case StaticAnalyser::Atari2600PagingModel::CommaVid:
bus_.reset(new CartridgeCommaVid(target.cartridges.front()->get_segments().front().data));
break;
case StaticAnalyser::Atari2600PagingModel::Atari8k:
if(target.atari.uses_superchip) {
bus_.reset(new CartridgeAtari8kSuperChip(target.cartridges.front()->get_segments().front().data));
} else {
bus_.reset(new CartridgeAtari8k(target.cartridges.front()->get_segments().front().data));
}
break;
}
/* if(!target.cartridges.front()->get_segments().size()) return;

6
Machines/Atari2600/Cartridge.hpp
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@ -60,6 +60,9 @@ template<class T> class Cartridge:
public Bus {
public:
Cartridge(const std::vector<uint8_t> &rom) :
rom_(rom) {}
void run_for_cycles(int number_of_cycles) { CPU6502::Processor<Cartridge<T>>::run_for_cycles(number_of_cycles); }
// to satisfy CPU6502::Processor
@ -201,6 +204,9 @@ template<class T> class Cartridge:
update_video();
speaker_->flush();
}
protected:
std::vector<uint8_t> rom_;
};
}

68
Machines/Atari2600/CartridgeAtari8k.hpp Normal file
View File

@ -0,0 +1,68 @@
//
// CartridgeAtari8k.h
// Clock Signal
//
// Created by Thomas Harte on 18/03/2017.
// Copyright © 2017 Thomas Harte. All rights reserved.
//
#ifndef CartridgeAtari8k_h
#define CartridgeAtari8k_h
#include "Cartridge.hpp"
namespace Atari2600 {
class CartridgeAtari8k: public Cartridge<CartridgeUnpaged> {
public:
CartridgeAtari8k(const std::vector<uint8_t> &rom) :
Cartridge(rom) {
rom_ptr_ = rom_.data();
}
void perform_bus_operation(CPU6502::BusOperation operation, uint16_t address, uint8_t *value) {
address &= 0x1fff;
if(!(address & 0x1000)) return;
if(address == 0x1ff8) rom_ptr_ = rom_.data();
else if(address == 0x1ff9) rom_ptr_ = rom_.data() + 4096;
if(isReadOperation(operation)) {
*value = rom_ptr_[address & 4095];
}
}
private:
uint8_t *rom_ptr_;
};
class CartridgeAtari8kSuperChip: public Cartridge<CartridgeUnpaged> {
public:
CartridgeAtari8kSuperChip(const std::vector<uint8_t> &rom) :
Cartridge(rom) {
rom_ptr_ = rom_.data();
}
void perform_bus_operation(CPU6502::BusOperation operation, uint16_t address, uint8_t *value) {
address &= 0x1fff;
if(!(address & 0x1000)) return;
if(address == 0x1ff8) rom_ptr_ = rom_.data();
if(address == 0x1ff9) rom_ptr_ = rom_.data() + 4096;
if(isReadOperation(operation)) {
*value = rom_ptr_[address & 4095];
}
if(address < 0x1080) ram_[address & 0x7f] = *value;
else if(address < 0x1100 && isReadOperation(operation)) *value = ram_[address & 0x7f];
}
private:
uint8_t *rom_ptr_;
uint8_t ram_[128];
};
}
#endif /* CartridgeAtari8k_h */

3
Machines/Atari2600/CartridgeCommaVid.h → Machines/Atari2600/CartridgeCommaVid.hpp
View File

@ -14,7 +14,7 @@ namespace Atari2600 {
class CartridgeCommaVid: public Cartridge<CartridgeCommaVid> {
public:
CartridgeCommaVid(const std::vector<uint8_t> &rom) :
rom_(rom) {}
Cartridge(rom) {}
void perform_bus_operation(CPU6502::BusOperation operation, uint16_t address, uint8_t *value) {
if(!(address & 0x1000)) return;
@ -34,7 +34,6 @@ class CartridgeCommaVid: public Cartridge<CartridgeCommaVid> {
}
private:
std::vector<uint8_t> rom_;
uint8_t ram_[1024];
};

5
Machines/Atari2600/CartridgeUnpaged.hpp
View File

@ -16,16 +16,13 @@ namespace Atari2600 {
class CartridgeUnpaged: public Cartridge<CartridgeUnpaged> {
public:
CartridgeUnpaged(const std::vector<uint8_t> &rom) :
rom_(rom) {}
Cartridge(rom) {}
void perform_bus_operation(CPU6502::BusOperation operation, uint16_t address, uint8_t *value) {
if(isReadOperation(operation) && (address & 0x1000)) {
*value = rom_[address & (rom_.size() - 1)];
}
}
private:
std::vector<uint8_t> rom_;
};
}

4
OSBindings/Mac/Clock Signal.xcodeproj/project.pbxproj
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@ -582,6 +582,8 @@
4B9CCDA21DA27C3F0098B625 /* CSJoystickMachine.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = CSJoystickMachine.h; sourceTree = "<group>"; };
4BA22B051D8817CE0008C640 /* Disk.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = Disk.cpp; path = ../../StaticAnalyser/Commodore/Disk.cpp; sourceTree = "<group>"; };
4BA22B061D8817CE0008C640 /* Disk.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = Disk.hpp; path = ../../StaticAnalyser/Commodore/Disk.hpp; sourceTree = "<group>"; };
4BA443E71E7DB54700C86749 /* CartridgeCommaVid.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = CartridgeCommaVid.hpp; sourceTree = "<group>"; };
4BA443E81E7DB8F900C86749 /* CartridgeAtari8k.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = CartridgeAtari8k.hpp; sourceTree = "<group>"; };
4BA61EAE1D91515900B3C876 /* NSData+StdVector.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = "NSData+StdVector.h"; sourceTree = "<group>"; };
4BA61EAF1D91515900B3C876 /* NSData+StdVector.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = "NSData+StdVector.mm"; sourceTree = "<group>"; };
4BA799931D8B656E0045123D /* StaticAnalyser.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = StaticAnalyser.cpp; path = ../../StaticAnalyser/Atari/StaticAnalyser.cpp; sourceTree = "<group>"; };
@ -1114,6 +1116,8 @@
4BE7C9171E3D397100A5496D /* TIA.hpp */,
4BE069991E7C942C00DD379F /* Cartridge.hpp */,
4BE0699A1E7C9C5A00DD379F /* CartridgeUnpaged.hpp */,
4BA443E71E7DB54700C86749 /* CartridgeCommaVid.hpp */,
4BA443E81E7DB8F900C86749 /* CartridgeAtari8k.hpp */,
);
path = Atari2600;
sourceTree = "<group>";