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Implemented speedy header finding. So that's half of it.
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@ -10,6 +10,7 @@
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#include <algorithm>
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#include <algorithm>
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#include "../../../Storage/Tape/Formats/TapePRG.hpp"
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#include "../../../Storage/Tape/Formats/TapePRG.hpp"
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#include "../../../Storage/Tape/Parsers/Commodore.hpp"
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#include "../../../StaticAnalyser/StaticAnalyser.hpp"
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#include "../../../StaticAnalyser/StaticAnalyser.hpp"
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using namespace Commodore::Vic20;
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using namespace Commodore::Vic20;
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@ -127,7 +128,25 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
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// CPU or 6560 costs.
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// CPU or 6560 costs.
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if(use_fast_tape_hack_ && tape_->has_tape() && operation == CPU6502::BusOperation::ReadOpcode) {
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if(use_fast_tape_hack_ && tape_->has_tape() && operation == CPU6502::BusOperation::ReadOpcode) {
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if(address == 0xf7b2) {
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if(address == 0xf7b2) {
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printf("Find header\n");
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// Address 0xf7b2 contains a JSR to 0xf8c0 that will fill the tape buffer with the next header.
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// So cancel that via a double NOP and fill in the next header programmatically.
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Storage::Tape::Commodore::Parser parser;
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std::unique_ptr<Storage::Tape::Commodore::Header> header = parser.get_next_header(tape_->get_tape());
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// serialise to wherever b2:b3 points
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uint16_t tape_buffer_pointer = (uint16_t)user_basic_memory_[0xb2] | (uint16_t)(user_basic_memory_[0xb3] << 8);
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if(header) {
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header->serialise(&user_basic_memory_[tape_buffer_pointer], 0x8000 - tape_buffer_pointer);
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} else {
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// no header found, so store end-of-tape
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user_basic_memory_[tape_buffer_pointer] = 0x05; // i.e. end of tape
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}
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// clear status and the verify flag
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user_basic_memory_[0x90] = 0;
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user_basic_memory_[0x93] = 0;
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*value = 0x0c; // i.e. NOP abs
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} else if(address == 0xf90b) {
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} else if(address == 0xf90b) {
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printf("Tape receive\n");
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printf("Tape receive\n");
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}
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}
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@ -119,6 +119,20 @@ std::unique_ptr<Header> Parser::get_next_header_body(const std::shared_ptr<Stora
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return header;
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return header;
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}
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}
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void Header::serialise(uint8_t *target, uint16_t length) {
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switch(type)
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{
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default: target[0] = 0xff; break;
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case Header::RelocatableProgram: target[0] = 0x01; break;
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case Header::DataBlock: target[0] = 0x02; break;
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case Header::NonRelocatableProgram: target[0] = 0x03; break;
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case Header::DataSequenceHeader: target[0] = 0x04; break;
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case Header::EndOfTape: target[0] = 0x05; break;
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}
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memcpy(&target[1], data.data(), 191);
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}
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std::unique_ptr<Data> Parser::get_next_data_body(const std::shared_ptr<Storage::Tape::Tape> &tape, bool is_original)
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std::unique_ptr<Data> Parser::get_next_data_body(const std::shared_ptr<Storage::Tape::Tape> &tape, bool is_original)
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{
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{
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std::unique_ptr<Data> data(new Data);
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std::unique_ptr<Data> data(new Data);
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@ -10,7 +10,6 @@
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#define Storage_Tape_Parsers_Commodore_hpp
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#define Storage_Tape_Parsers_Commodore_hpp
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#include "TapeParser.hpp"
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#include "TapeParser.hpp"
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//#include "Utilities.hpp"
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#include <memory>
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#include <memory>
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#include <string>
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#include <string>
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@ -43,6 +42,12 @@ struct Header {
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uint16_t ending_address;
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uint16_t ending_address;
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bool parity_was_valid;
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bool parity_was_valid;
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bool duplicate_matched;
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bool duplicate_matched;
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/*!
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Writes a byte serialised version of this header to @c target, writing at most
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@c length bytes.
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*/
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void serialise(uint8_t *target, uint16_t length);
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};
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};
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struct Data {
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struct Data {
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