6502/CLK
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Access timing now appears to be exactly on the nail. Disabled automatic interrupt expiration again as I'm not persuaded it's correct for at least the RTC.

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This commit is contained in:
Thomas Harte 2016-03-10 23:12:28 -05:00
parent e305fd9326
commit 763d5e8819
1 changed files with 13 additions and 22 deletions
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35
Machines/Electron/Electron.cpp
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@ -32,7 +32,7 @@ namespace {
}
#define graphics_line(v) ((((v) >> 7) - first_graphics_line + field_divider_line) % field_divider_line)
#define graphics_column(v) ((((v) %127) - first_graphics_cycle) % 127)
#define graphics_column(v) ((((v) & 127) - first_graphics_cycle + 128) & 127)
Machine::Machine() :
_interrupt_control(0),
@ -93,9 +93,10 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
cycles += 1 + (_frameCycles&1);
if(_screen_mode < 4)
{
const int current_line = graphics_line(_frameCycles + cycles);
const int current_column = graphics_column(_frameCycles + cycles);
if(current_line < 256 && current_column < 80)
update_display();
const int current_line = graphics_line(_frameCycles); // + cycles
const int current_column = graphics_column(_frameCycles); // + cycles
if(current_line < 256 && current_column < 80 && !_isBlankLine)
cycles += (unsigned int)(80 - current_column);
}
}
@ -297,25 +298,15 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
// implicit assumption here: the number of 2Mhz cycles this bus operation will take
// is never longer than a line. On the Electron, it's a safe one.
switch(line_before_cycle)
if(line_before_cycle != line_after_cycle)
{
case real_time_clock_interrupt_line:
if(line_after_cycle > real_time_clock_interrupt_line)
signal_interrupt(Interrupt::RealTimeClock);
break;
case real_time_clock_interrupt_line+1:
if(line_after_cycle > real_time_clock_interrupt_line+1)
clear_interrupt(Interrupt::RealTimeClock);
break;
case display_end_interrupt_line:
if(line_after_cycle > display_end_interrupt_line)
signal_interrupt(Interrupt::DisplayEnd);
break;
case display_end_interrupt_line+1:
if(line_after_cycle > display_end_interrupt_line+1)
clear_interrupt(Interrupt::DisplayEnd);
break;
switch(line_before_cycle)
{
case real_time_clock_interrupt_line: signal_interrupt(Interrupt::RealTimeClock); break;
// case real_time_clock_interrupt_line+1: clear_interrupt(Interrupt::RealTimeClock); break;
case display_end_interrupt_line: signal_interrupt(Interrupt::DisplayEnd); break;
// case display_end_interrupt_line+1: clear_interrupt(Interrupt::DisplayEnd); break;
}
}
_frameCycles += cycles;