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r187486 Sunday 19th June, 2022 at 23:18:12 UTC by Vasantha Crabb
bus/nubus: Better SuperMac Spectrum/8 CRTC emulation.

* Implemented sync pulse width registers and moved sync to be logically
 at the end of the line/frame.
* Fixed vertical offset in 480i mode and made vertical blanking
 interrupt fire at field frequency.
[src/devices/bus/nubus]nubus_spec8.cpp nubus_spec8.h


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