6502/CLK
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Switched to probably more accurate contended memory, resolved issue of not leaving the tape data received interrupt set when returning a byte from the fast tape, fixing Joe Blade, and tested slightly further to determine that interrupts probably signal upon entry into horizontal sync.

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This commit is contained in:
Thomas Harte 2016-03-14 19:29:28 -04:00
parent fb26b38ff9
commit 15120d8fb6
1 changed files with 7 additions and 6 deletions
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13
Machines/Electron/Electron.cpp
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@ -95,8 +95,8 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
if(_screen_mode < 4)
{
update_display();
const int current_line = graphics_line(_frameCycles); // + cycles
const int current_column = graphics_column(_frameCycles); // + cycles
const int current_line = graphics_line(_frameCycles + (_frameCycles&1));
const int current_column = graphics_column(_frameCycles + (_frameCycles&1));
if(current_line < 256 && current_column < 80 && !_isBlankLine)
cycles += (unsigned int)(80 - current_column);
}
@ -310,6 +310,7 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
) break;
}
_tape.set_delegate(this);
_interrupt_status |= _tape.get_interrupt_status();
_fast_load_is_in_data = true;
set_value_of_register(CPU6502::Register::A, 0);
@ -356,7 +357,7 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
// printf("%04x: %02x (%d)\n", address, *value, _fieldCycles);
// }
const unsigned int pixel_line_clock = _frameCycles + 128 - first_graphics_cycle + 80;
const unsigned int pixel_line_clock = _frameCycles;// + 128 - first_graphics_cycle + 80;
const unsigned int line_before_cycle = graphics_line(pixel_line_clock);
const unsigned int line_after_cycle = graphics_line(pixel_line_clock + cycles);
@ -963,9 +964,9 @@ inline void Tape::run_for_cycles(unsigned int number_of_cycles)
else
{
_output.cycles_into_pulse += number_of_cycles;
while(_output.cycles_into_pulse > 1666)
{
_output.cycles_into_pulse -= 1666;
while(_output.cycles_into_pulse > 1664) // 1664 = the closest you can get to 1200 baud if you're looking for something
{ // that divides the 125,000Hz clock that the sound divider runs off.
_output.cycles_into_pulse -= 1664;
push_tape_bit(1);
}
}