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Merge branch 'master' into BufferOverflow

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This commit is contained in:
Thomas Harte 2017-07-07 21:11:07 -04:00
commit 7476c64a66
5 changed files with 22 additions and 8 deletions
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17
Machines/ZX8081/ZX8081.cpp
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@ -22,7 +22,8 @@ Machine::Machine() :
hsync_(false), hsync_(false),
nmi_is_enabled_(false), nmi_is_enabled_(false),
tape_player_(ZX8081ClockRate), tape_player_(ZX8081ClockRate),
use_fast_tape_hack_(false) { use_fast_tape_hack_(false),
tape_advance_delay_(0) {
set_clock_rate(ZX8081ClockRate); set_clock_rate(ZX8081ClockRate);
tape_player_.set_motor_control(true); tape_player_.set_motor_control(true);
clear_all_keys(); clear_all_keys();
@ -53,7 +54,11 @@ int Machine::perform_machine_cycle(const CPU::Z80::PartialMachineCycle &cycle) {
} }
if(is_zx81_) horizontal_counter_ %= 207; if(is_zx81_) horizontal_counter_ %= 207;
if(!tape_advance_delay_) {
tape_player_.run_for_cycles(cycle.length); tape_player_.run_for_cycles(cycle.length);
} else {
tape_advance_delay_ = std::max(tape_advance_delay_ - cycle.length, 0);
}
if(nmi_is_enabled_ && !get_halt_line() && get_non_maskable_interrupt_line()) { if(nmi_is_enabled_ && !get_halt_line() && get_non_maskable_interrupt_line()) {
set_wait_line(true); set_wait_line(true);
@ -124,14 +129,22 @@ int Machine::perform_machine_cycle(const CPU::Z80::PartialMachineCycle &cycle) {
case CPU::Z80::PartialMachineCycle::ReadOpcodeStart: case CPU::Z80::PartialMachineCycle::ReadOpcodeStart:
case CPU::Z80::PartialMachineCycle::ReadOpcodeWait: case CPU::Z80::PartialMachineCycle::ReadOpcodeWait:
// Check for use of the fast tape hack. // Check for use of the fast tape hack.
if(use_fast_tape_hack_ && address == tape_trap_address_) { if(use_fast_tape_hack_ && address == tape_trap_address_ && tape_player_.has_tape()) {
Storage::Time time = tape_player_.get_tape()->get_current_time();
int next_byte = parser_.get_next_byte(tape_player_.get_tape()); int next_byte = parser_.get_next_byte(tape_player_.get_tape());
if(next_byte != -1) { if(next_byte != -1) {
uint16_t hl = get_value_of_register(CPU::Z80::Register::HL); uint16_t hl = get_value_of_register(CPU::Z80::Register::HL);
ram_[hl & ram_mask_] = (uint8_t)next_byte; ram_[hl & ram_mask_] = (uint8_t)next_byte;
*cycle.value = 0x00; *cycle.value = 0x00;
set_value_of_register(CPU::Z80::Register::ProgramCounter, tape_return_address_ - 1); set_value_of_register(CPU::Z80::Register::ProgramCounter, tape_return_address_ - 1);
// Assume that having read one byte quickly, we're probably going to be asked to read
// another shortly. Therefore, temporarily disable the tape motor for 1000 cycles in order
// to avoid fighting with real time. This is a stop-gap fix.
tape_advance_delay_ = 1000;
return 0; return 0;
} else {
tape_player_.get_tape()->seek(time);
} }
} }
is_opcode_read = true; is_opcode_read = true;

1
Machines/ZX8081/ZX8081.hpp
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@ -94,6 +94,7 @@ class Machine:
uint8_t latched_video_byte_; uint8_t latched_video_byte_;
bool use_fast_tape_hack_; bool use_fast_tape_hack_;
int tape_advance_delay_;
}; };
} }

2
Storage/Tape/Formats/ZX80O81P.cpp
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@ -54,7 +54,7 @@ Tape::Pulse ZX80O81P::virtual_get_next_pulse() {
// Start with 1 second of silence. // Start with 1 second of silence.
if(!is_past_silence_ || has_finished_data()) { if(!is_past_silence_ || has_finished_data()) {
pulse.type = Pulse::Type::Low; pulse.type = Pulse::Type::Low;
pulse.length.length = 5; pulse.length.length = 10;
pulse.length.clock_rate = 1; pulse.length.clock_rate = 1;
is_past_silence_ = true; is_past_silence_ = true;
has_ended_final_byte_ = has_finished_data(); has_ended_final_byte_ = has_finished_data();

6
Storage/Tape/Parsers/ZX8081.cpp
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@ -79,10 +79,10 @@ void Parser::inspect_waves(const std::vector<WaveType> &waves) {
// the gap that follows the bit due to the simplified "high is high, everything else is low" // the gap that follows the bit due to the simplified "high is high, everything else is low"
// logic applied to pulse detection. So those two things will merge. Meaning we're looking for // logic applied to pulse detection. So those two things will merge. Meaning we're looking for
// 17 and/or 7 pulses. // 17 and/or 7 pulses.
int gaps_to_swallow = (int)wave_offset + ((waves[number_of_pulses + wave_offset] == WaveType::Gap) ? 1 : 0); size_t gaps_to_swallow = wave_offset + ((waves[number_of_pulses + wave_offset] == WaveType::Gap) ? 1 : 0);
switch(number_of_pulses) { switch(number_of_pulses) {
case 17: push_symbol(SymbolType::One, 17 + gaps_to_swallow); break; case 18: case 17: push_symbol(SymbolType::One, (int)(number_of_pulses + gaps_to_swallow)); break;
case 7: push_symbol(SymbolType::Zero, 7 + gaps_to_swallow); break; case 8: case 7: push_symbol(SymbolType::Zero, (int)(number_of_pulses + gaps_to_swallow)); break;
default: push_symbol(SymbolType::Unrecognised, 1); break; default: push_symbol(SymbolType::Unrecognised, 1); break;
} }
} }

2
Storage/Tape/Tape.cpp
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@ -22,7 +22,7 @@ TapePlayer::TapePlayer(unsigned int input_clock_rate) :
void Storage::Tape::Tape::seek(Time &seek_time) { void Storage::Tape::Tape::seek(Time &seek_time) {
current_time_.set_zero(); current_time_.set_zero();
next_time_.set_zero(); next_time_.set_zero();
while(next_time_ < seek_time) get_next_pulse(); while(next_time_ <= seek_time) get_next_pulse();
} }
void Storage::Tape::Tape::reset() { void Storage::Tape::Tape::reset() {