mirror of
https://github.com/TomHarte/CLK.git
synced 2025-04-06 10:38:16 +00:00
In theory unpaged cartridges should now work. Time to debug.
This commit is contained in:
Thomas Harte
parent
14a76af0d3
commit
7958459db9
@ -10,6 +10,8 @@
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#include <algorithm>
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#include <stdio.h>
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#include "CartridgeUnpaged.hpp"
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using namespace Atari2600;
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namespace {
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static const double NTSC_clock_rate = 1194720;
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@ -19,278 +21,41 @@ namespace {
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Machine::Machine() :
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rom_(nullptr),
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rom_pages_{nullptr, nullptr, nullptr, nullptr},
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tia_input_value_{0xff, 0xff},
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cycles_since_speaker_update_(0),
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cycles_since_video_update_(0),
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cycles_since_6532_update_(0),
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frame_record_pointer_(0),
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is_ntsc_(true) {
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set_clock_rate(NTSC_clock_rate);
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}
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void Machine::setup_output(float aspect_ratio) {
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tia_.reset(new TIA);
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speaker_.reset(new Speaker);
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speaker_->set_input_rate((float)(get_clock_rate() / 38.0));
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tia_->get_crt()->set_delegate(this);
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bus_->tia_.reset(new TIA);
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bus_->speaker_.reset(new Speaker);
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bus_->speaker_->set_input_rate((float)(get_clock_rate() / 38.0));
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bus_->tia_->get_crt()->set_delegate(this);
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}
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void Machine::close_output() {
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tia_ = nullptr;
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speaker_ = nullptr;
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bus_.reset();
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}
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Machine::~Machine() {
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delete[] rom_;
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close_output();
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}
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unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uint16_t address, uint8_t *value) {
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uint8_t returnValue = 0xff;
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unsigned int cycles_run_for = 3;
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// this occurs as a feedback loop — the 2600 requests ready, then performs the cycles_run_for
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// leap to the end of ready only once ready is signalled — because on a 6502 ready doesn't take
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// effect until the next read; therefore it isn't safe to assume that signalling ready immediately
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// skips to the end of the line.
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if(operation == CPU6502::BusOperation::Ready)
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cycles_run_for = (unsigned int)tia_->get_cycles_until_horizontal_blank(cycles_since_video_update_);
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cycles_since_speaker_update_ += cycles_run_for;
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cycles_since_video_update_ += cycles_run_for;
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cycles_since_6532_update_ += (cycles_run_for / 3);
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if(operation != CPU6502::BusOperation::Ready) {
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uint16_t masked_address = address & 0x1fff;
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#define AtariPager(start, end) \
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if(masked_address >= start && masked_address <= end) { \
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uint8_t *base_ptr = &rom_[(masked_address - start) * 4096];\
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if(base_ptr != rom_pages_[0]) {\
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rom_pages_[0] = base_ptr;\
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rom_pages_[1] = base_ptr + 1024;\
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rom_pages_[2] = base_ptr + 2048;\
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rom_pages_[3] = base_ptr + 3072;\
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}\
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}
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// check for potential paging
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switch(paging_model_) {
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default:
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break;
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case StaticAnalyser::Atari2600PagingModel::Atari8k: AtariPager(0x1ff8, 0x1ff9); break;
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case StaticAnalyser::Atari2600PagingModel::CBSRamPlus: AtariPager(0x1ff8, 0x1ffa); break;
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case StaticAnalyser::Atari2600PagingModel::Atari16k: AtariPager(0x1ff6, 0x1ff9); break;
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case StaticAnalyser::Atari2600PagingModel::Atari32k: AtariPager(0x1ff4, 0x1ffb); break;
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case StaticAnalyser::Atari2600PagingModel::ParkerBros:
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if(masked_address >= 0x1fe0 && masked_address < 0x1ff8) {
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int slot = (masked_address >> 3) & 3;
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int target = masked_address & 7;
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rom_pages_[slot] = &rom_[target * 1024];
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}
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break;
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case StaticAnalyser::Atari2600PagingModel::MegaBoy:
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if(masked_address == 0x1fec && isReadOperation(operation)) {
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*value = mega_boy_page_;
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}
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if(masked_address == 0x1ff0) {
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mega_boy_page_ = (mega_boy_page_ + 1) & 15;
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rom_pages_[0] = &rom_[mega_boy_page_ * 4096];
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rom_pages_[1] = rom_pages_[0] + 1024;
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rom_pages_[2] = rom_pages_[0] + 2048;
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rom_pages_[3] = rom_pages_[0] + 3072;
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}
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break;
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case StaticAnalyser::Atari2600PagingModel::MNetwork:
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if(masked_address >= 0x1fe0 && masked_address < 0x1fe7) {
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int target = (masked_address & 7) * 2048;
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rom_pages_[0] = &rom_[target];
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rom_pages_[1] = &rom_[target] + 1024;
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} else if(masked_address == 0x1fe7) {
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for(int c = 0; c < 8; c++) {
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ram_write_targets_[c] = ram_.data() + 1024 + c * 128;
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ram_read_targets_[c + 8] = ram_write_targets_[c];
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}
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} else if(masked_address >= 0x1fe8 && masked_address <= 0x1ffb) {
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int offset = (masked_address - 0x1fe8) * 256;
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ram_write_targets_[16] = ram_.data() + offset;
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ram_write_targets_[17] = ram_write_targets_[16] + 128;
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ram_read_targets_[18] = ram_write_targets_[16];
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ram_read_targets_[19] = ram_write_targets_[17];
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}
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break;
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case StaticAnalyser::Atari2600PagingModel::ActivisionStack:
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if(operation == CPU6502::BusOperation::ReadOpcode) {
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// if the last operation was either a JSR or an RTS, pick a new page
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// based on the address now being accesses
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if(last_opcode_ == 0x20 || last_opcode_ == 0x60) {
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if(address & 0x2000) {
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rom_pages_[0] = rom_;
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} else {
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rom_pages_[0] = &rom_[4096];
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}
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rom_pages_[1] = rom_pages_[0] + 1024;
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rom_pages_[2] = rom_pages_[0] + 2048;
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rom_pages_[3] = rom_pages_[0] + 3072;
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}
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}
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break;
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}
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#undef AtariPager
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// check for a ROM read
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if(address&0x1000) {
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int ram_page = (masked_address & 0xfff) >> 7;
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ram_write_targets_[ram_page][masked_address & 0x7f] = *value;
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if(isReadOperation(operation)) {
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if(ram_read_targets_[ram_page]) {
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returnValue &= ram_read_targets_[ram_page][masked_address & 0x7f];
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} else {
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returnValue &= rom_pages_[(address >> 10)&3][address&1023];
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}
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}
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}
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// check for a RIOT RAM access
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if((address&0x1280) == 0x80) {
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if(isReadOperation(operation)) {
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returnValue &= mos6532_.get_ram(address);
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} else {
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mos6532_.set_ram(address, *value);
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}
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}
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// check for a TIA access
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if(!(address&0x1080)) {
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if(isReadOperation(operation)) {
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const uint16_t decodedAddress = address & 0xf;
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switch(decodedAddress) {
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case 0x00: // missile 0 / player collisions
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case 0x01: // missile 1 / player collisions
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case 0x02: // player 0 / playfield / ball collisions
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case 0x03: // player 1 / playfield / ball collisions
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case 0x04: // missile 0 / playfield / ball collisions
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case 0x05: // missile 1 / playfield / ball collisions
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case 0x06: // ball / playfield collisions
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case 0x07: // player / player, missile / missile collisions
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returnValue &= tia_->get_collision_flags(decodedAddress);
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break;
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case 0x08:
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case 0x09:
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case 0x0a:
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case 0x0b:
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// TODO: pot ports
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returnValue &= 0;
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break;
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case 0x0c:
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case 0x0d:
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returnValue &= tia_input_value_[decodedAddress - 0x0c];
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break;
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}
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} else {
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const uint16_t decodedAddress = address & 0x3f;
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switch(decodedAddress) {
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case 0x00: update_video(); tia_->set_sync(*value & 0x02); break;
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case 0x01: update_video(); tia_->set_blank(*value & 0x02); break;
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case 0x02: set_ready_line(true); break;
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case 0x03: update_video(); tia_->reset_horizontal_counter(); break;
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// TODO: audio will now be out of synchronisation — fix
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case 0x04:
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case 0x05: update_video(); tia_->set_player_number_and_size(decodedAddress - 0x04, *value); break;
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case 0x06:
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case 0x07: update_video(); tia_->set_player_missile_colour(decodedAddress - 0x06, *value); break;
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case 0x08: update_video(); tia_->set_playfield_ball_colour(*value); break;
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case 0x09: update_video(); tia_->set_background_colour(*value); break;
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case 0x0a: update_video(); tia_->set_playfield_control_and_ball_size(*value); break;
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case 0x0b:
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case 0x0c: update_video(); tia_->set_player_reflected(decodedAddress - 0x0b, !((*value)&8)); break;
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case 0x0d:
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case 0x0e:
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case 0x0f: update_video(); tia_->set_playfield(decodedAddress - 0x0d, *value); break;
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case 0x10:
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case 0x11: update_video(); tia_->set_player_position(decodedAddress - 0x10); break;
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case 0x12:
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case 0x13: update_video(); tia_->set_missile_position(decodedAddress - 0x12); break;
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case 0x14: update_video(); tia_->set_ball_position(); break;
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case 0x1b:
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case 0x1c: update_video(); tia_->set_player_graphic(decodedAddress - 0x1b, *value); break;
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case 0x1d:
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case 0x1e: update_video(); tia_->set_missile_enable(decodedAddress - 0x1d, (*value)&2); break;
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case 0x1f: update_video(); tia_->set_ball_enable((*value)&2); break;
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case 0x20:
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case 0x21: update_video(); tia_->set_player_motion(decodedAddress - 0x20, *value); break;
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case 0x22:
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case 0x23: update_video(); tia_->set_missile_motion(decodedAddress - 0x22, *value); break;
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case 0x24: update_video(); tia_->set_ball_motion(*value); break;
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case 0x25:
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case 0x26: tia_->set_player_delay(decodedAddress - 0x25, (*value)&1); break;
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case 0x27: tia_->set_ball_delay((*value)&1); break;
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case 0x28:
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case 0x29: update_video(); tia_->set_missile_position_to_player(decodedAddress - 0x28, (*value)&2); break;
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case 0x2a: update_video(); tia_->move(); break;
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case 0x2b: update_video(); tia_->clear_motion(); break;
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case 0x2c: update_video(); tia_->clear_collision_flags(); break;
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case 0x15:
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case 0x16: update_audio(); speaker_->set_control(decodedAddress - 0x15, *value); break;
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case 0x17:
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case 0x18: update_audio(); speaker_->set_divider(decodedAddress - 0x17, *value); break;
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case 0x19:
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case 0x1a: update_audio(); speaker_->set_volume(decodedAddress - 0x19, *value); break;
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case 0x3f:
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if(paging_model_ == StaticAnalyser::Atari2600PagingModel::Tigervision && (masked_address == 0x3f)) {
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int selected_page = (*value) % (rom_size_ / 2048);
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rom_pages_[0] = &rom_[selected_page * 2048];
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rom_pages_[1] = rom_pages_[0] + 1024;
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}
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break;
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}
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}
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}
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// check for a PIA access
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if((address&0x1280) == 0x280) {
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update_6532();
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if(isReadOperation(operation)) {
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returnValue &= mos6532_.get_register(address);
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} else {
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mos6532_.set_register(address, *value);
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}
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}
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if(isReadOperation(operation)) {
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if(operation == CPU6502::BusOperation::ReadOpcode) last_opcode_ = returnValue;
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*value = returnValue;
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}
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}
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if(!tia_->get_cycles_until_horizontal_blank(cycles_since_video_update_)) set_ready_line(false);
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return cycles_run_for / 3;
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}
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void Machine::set_digital_input(Atari2600DigitalInput input, bool state) {
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switch (input) {
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case Atari2600DigitalInputJoy1Up: mos6532_.update_port_input(0, 0x10, state); break;
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case Atari2600DigitalInputJoy1Down: mos6532_.update_port_input(0, 0x20, state); break;
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case Atari2600DigitalInputJoy1Left: mos6532_.update_port_input(0, 0x40, state); break;
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case Atari2600DigitalInputJoy1Right: mos6532_.update_port_input(0, 0x80, state); break;
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case Atari2600DigitalInputJoy1Up: bus_->mos6532_.update_port_input(0, 0x10, state); break;
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case Atari2600DigitalInputJoy1Down: bus_->mos6532_.update_port_input(0, 0x20, state); break;
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case Atari2600DigitalInputJoy1Left: bus_->mos6532_.update_port_input(0, 0x40, state); break;
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case Atari2600DigitalInputJoy1Right: bus_->mos6532_.update_port_input(0, 0x80, state); break;
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case Atari2600DigitalInputJoy2Up: mos6532_.update_port_input(0, 0x01, state); break;
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case Atari2600DigitalInputJoy2Down: mos6532_.update_port_input(0, 0x02, state); break;
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case Atari2600DigitalInputJoy2Left: mos6532_.update_port_input(0, 0x04, state); break;
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case Atari2600DigitalInputJoy2Right: mos6532_.update_port_input(0, 0x08, state); break;
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case Atari2600DigitalInputJoy2Up: bus_->mos6532_.update_port_input(0, 0x01, state); break;
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case Atari2600DigitalInputJoy2Down: bus_->mos6532_.update_port_input(0, 0x02, state); break;
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case Atari2600DigitalInputJoy2Left: bus_->mos6532_.update_port_input(0, 0x04, state); break;
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case Atari2600DigitalInputJoy2Right: bus_->mos6532_.update_port_input(0, 0x08, state); break;
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// TODO: latching
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case Atari2600DigitalInputJoy1Fire: if(state) tia_input_value_[0] &= ~0x80; else tia_input_value_[0] |= 0x80; break;
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case Atari2600DigitalInputJoy2Fire: if(state) tia_input_value_[1] &= ~0x80; else tia_input_value_[1] |= 0x80; break;
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case Atari2600DigitalInputJoy1Fire: if(state) bus_->tia_input_value_[0] &= ~0x80; else bus_->tia_input_value_[0] |= 0x80; break;
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case Atari2600DigitalInputJoy2Fire: if(state) bus_->tia_input_value_[1] &= ~0x80; else bus_->tia_input_value_[1] |= 0x80; break;
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default: break;
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}
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@ -298,16 +63,17 @@ void Machine::set_digital_input(Atari2600DigitalInput input, bool state) {
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void Machine::set_switch_is_enabled(Atari2600Switch input, bool state) {
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switch(input) {
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case Atari2600SwitchReset: mos6532_.update_port_input(1, 0x01, state); break;
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case Atari2600SwitchSelect: mos6532_.update_port_input(1, 0x02, state); break;
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case Atari2600SwitchColour: mos6532_.update_port_input(1, 0x08, state); break;
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case Atari2600SwitchLeftPlayerDifficulty: mos6532_.update_port_input(1, 0x40, state); break;
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case Atari2600SwitchRightPlayerDifficulty: mos6532_.update_port_input(1, 0x80, state); break;
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case Atari2600SwitchReset: bus_->mos6532_.update_port_input(1, 0x01, state); break;
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case Atari2600SwitchSelect: bus_->mos6532_.update_port_input(1, 0x02, state); break;
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case Atari2600SwitchColour: bus_->mos6532_.update_port_input(1, 0x08, state); break;
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case Atari2600SwitchLeftPlayerDifficulty: bus_->mos6532_.update_port_input(1, 0x40, state); break;
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case Atari2600SwitchRightPlayerDifficulty: bus_->mos6532_.update_port_input(1, 0x80, state); break;
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}
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}
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void Machine::configure_as_target(const StaticAnalyser::Target &target) {
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if(!target.cartridges.front()->get_segments().size()) return;
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bus_.reset(new CartridgeUnpaged(target.cartridges.front()->get_segments().front().data));
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/* if(!target.cartridges.front()->get_segments().size()) return;
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Storage::Cartridge::Cartridge::Segment segment = target.cartridges.front()->get_segments().front();
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size_t length = segment.data.size();
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@ -382,32 +148,7 @@ void Machine::configure_as_target(const StaticAnalyser::Target &target) {
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break;
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}
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paging_model_ = target.atari.paging_model;
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}
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#pragma mark - Audio and Video
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void Machine::update_audio() {
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unsigned int audio_cycles = cycles_since_speaker_update_ / 114;
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speaker_->run_for_cycles(audio_cycles);
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cycles_since_speaker_update_ %= 114;
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}
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void Machine::update_video() {
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tia_->run_for_cycles((int)cycles_since_video_update_);
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cycles_since_video_update_ = 0;
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}
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void Machine::update_6532() {
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mos6532_.run_for_cycles(cycles_since_6532_update_);
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cycles_since_6532_update_ = 0;
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}
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void Machine::synchronise() {
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update_audio();
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update_video();
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speaker_->flush();
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paging_model_ = target.atari.paging_model;*/
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}
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#pragma mark - CRT delegate
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@ -436,14 +177,14 @@ void Machine::crt_did_end_batch_of_frames(Outputs::CRT::CRT *crt, unsigned int n
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double clock_rate;
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if(is_ntsc_) {
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clock_rate = NTSC_clock_rate;
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tia_->set_output_mode(TIA::OutputMode::NTSC);
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bus_->tia_->set_output_mode(TIA::OutputMode::NTSC);
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} else {
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clock_rate = PAL_clock_rate;
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tia_->set_output_mode(TIA::OutputMode::PAL);
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bus_->tia_->set_output_mode(TIA::OutputMode::PAL);
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}
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speaker_->set_input_rate((float)(clock_rate / 38.0));
|
||||
speaker_->set_high_frequency_cut_off((float)(clock_rate / (38.0 * 2.0)));
|
||||
bus_->speaker_->set_input_rate((float)(clock_rate / 38.0));
|
||||
bus_->speaker_->set_high_frequency_cut_off((float)(clock_rate / (38.0 * 2.0)));
|
||||
set_clock_rate(clock_rate);
|
||||
}
|
||||
}
|
||||
|
||||
@ -49,9 +49,9 @@ class Machine:
|
||||
// to satisfy CRTMachine::Machine
|
||||
virtual void setup_output(float aspect_ratio);
|
||||
virtual void close_output();
|
||||
virtual std::shared_ptr<Outputs::CRT::CRT> get_crt() { return cartridge_->tia_->get_crt(); }
|
||||
virtual std::shared_ptr<Outputs::Speaker> get_speaker() { return cartridge_->speaker_; }
|
||||
virtual void run_for_cycles(int number_of_cycles) { cartridge_->run_for_cycles(number_of_cycles); }
|
||||
virtual std::shared_ptr<Outputs::CRT::CRT> get_crt() { return bus_->tia_->get_crt(); }
|
||||
virtual std::shared_ptr<Outputs::Speaker> get_speaker() { return bus_->speaker_; }
|
||||
virtual void run_for_cycles(int number_of_cycles) { bus_->run_for_cycles(number_of_cycles); }
|
||||
|
||||
// to satisfy Outputs::CRT::Delegate
|
||||
virtual void crt_did_end_batch_of_frames(Outputs::CRT::CRT *crt, unsigned int number_of_frames, unsigned int number_of_unexpected_vertical_syncs);
|
||||
@ -72,7 +72,7 @@ class Machine:
|
||||
uint8_t last_opcode_;
|
||||
|
||||
// the cartridge
|
||||
std::unique_ptr<CartridgeBase> cartridge_;
|
||||
std::unique_ptr<Bus> bus_;
|
||||
|
||||
// output frame rate tracker
|
||||
struct FrameRecord
|
||||
|
||||
@ -9,10 +9,18 @@
|
||||
#ifndef Atari2600_Cartridge_hpp
|
||||
#define Atari2600_Cartridge_hpp
|
||||
|
||||
#include "../../Processors/6502/CPU6502.hpp"
|
||||
|
||||
namespace Atari2600 {
|
||||
|
||||
class CartridgeBase {
|
||||
class Bus {
|
||||
public:
|
||||
Bus() :
|
||||
tia_input_value_{0xff, 0xff},
|
||||
cycles_since_speaker_update_(0),
|
||||
cycles_since_video_update_(0),
|
||||
cycles_since_6532_update_(0) {}
|
||||
|
||||
virtual void run_for_cycles(int number_of_cycles) = 0;
|
||||
|
||||
// the RIOT, TIA and speaker
|
||||
@ -49,7 +57,7 @@ class CartridgeBase {
|
||||
|
||||
template<class T> class Cartridge:
|
||||
public CPU6502::Processor<Cartridge<T>>,
|
||||
public CartridgeBase {
|
||||
public Bus {
|
||||
|
||||
public:
|
||||
void run_for_cycles(int number_of_cycles) {}
|
||||
@ -71,7 +79,7 @@ template<class T> class Cartridge:
|
||||
cycles_since_6532_update_ += (cycles_run_for / 3);
|
||||
|
||||
if(operation != CPU6502::BusOperation::Ready) {
|
||||
uint16_t masked_address = address & 0x1fff;
|
||||
// uint16_t masked_address = address & 0x1fff;
|
||||
|
||||
// give the cartridge a chance to respond to the bus access
|
||||
static_cast<T *>(this)->perform_bus_operation(operation, address, value);
|
||||
@ -120,7 +128,7 @@ template<class T> class Cartridge:
|
||||
case 0x00: update_video(); tia_->set_sync(*value & 0x02); break;
|
||||
case 0x01: update_video(); tia_->set_blank(*value & 0x02); break;
|
||||
|
||||
case 0x02: set_ready_line(true); break;
|
||||
case 0x02: CPU6502::Processor<Cartridge<T>>::set_ready_line(true); break;
|
||||
case 0x03: update_video(); tia_->reset_horizontal_counter(); break;
|
||||
// TODO: audio will now be out of synchronisation — fix
|
||||
|
||||
@ -185,7 +193,7 @@ template<class T> class Cartridge:
|
||||
}
|
||||
}
|
||||
|
||||
if(!tia_->get_cycles_until_horizontal_blank(cycles_since_video_update_)) set_ready_line(false);
|
||||
if(!tia_->get_cycles_until_horizontal_blank(cycles_since_video_update_)) CPU6502::Processor<Cartridge<T>>::set_ready_line(false);
|
||||
|
||||
return cycles_run_for / 3;
|
||||
}
|
||||
|
||||
@ -13,6 +13,21 @@
|
||||
|
||||
namespace Atari2600 {
|
||||
|
||||
class CartridgeUnpaged: public Cartridge<CartridgeUnpaged> {
|
||||
public:
|
||||
CartridgeUnpaged(const std::vector<uint8_t> &rom) :
|
||||
rom_(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_;
|
||||
};
|
||||
|
||||
}
|
||||
|
||||
#endif /* Atari2600_CartridgeUnpaged_hpp */
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user