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Merge pull request #476 from TomHarte/LongLines
Increases permissible error in scanline length.
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@ -42,8 +42,16 @@ void CRT::set_new_timing(unsigned int cycles_per_line, unsigned int height_of_di
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// the gist for simple debugging
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sync_capacitor_charge_threshold_ = ((vertical_sync_half_lines - 2) * cycles_per_line) >> 1;
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// create the two flywheels
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horizontal_flywheel_.reset(new Flywheel(multiplied_cycles_per_line, (millisecondsHorizontalRetraceTime * multiplied_cycles_per_line) >> 6, multiplied_cycles_per_line >> 6));
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// Create the two flywheels:
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//
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// The horizontal flywheel has an ideal period of `multiplied_cycles_per_line`, will accept syncs
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// within 1/32nd of that (i.e. tolerates 3.125% error) and takes millisecondsHorizontalRetraceTime
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// to retrace.
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//
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// The vertical slywheel has an ideal period of `multiplied_cycles_per_line * height_of_display`,
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// will accept syncs within 1/8th of that (i.e. tolerates 12.5% error) and takes scanlinesVerticalRetraceTime
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// to retrace.
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horizontal_flywheel_.reset(new Flywheel(multiplied_cycles_per_line, (millisecondsHorizontalRetraceTime * multiplied_cycles_per_line) >> 6, multiplied_cycles_per_line >> 5));
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vertical_flywheel_.reset(new Flywheel(multiplied_cycles_per_line * height_of_display, scanlinesVerticalRetraceTime * multiplied_cycles_per_line, (multiplied_cycles_per_line * height_of_display) >> 3));
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// figure out the divisor necessary to get the horizontal flywheel into a 16-bit range
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