Re: [stella] TIA VSYNC and VBLANK

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Re: [stella] TIA VSYNC and VBLANK

Subject: Re: [stella] TIA VSYNC and VBLANK
From: "Eric Ball" <ericball@xxxxxxxxxxxx>
Date: Tue, 5 Oct 2004 15:00:56 -0400

> VSYNC is used to generate the composite sync output SYN.  (how, exactly?
> is SYN simply VSYNC xor'd with the horizontal blank?)

Almost.  VSYNC causes the horizontal sync pulse timing to change from a
single ~4.7uS pulse per line to two ~27.3uS pulses per line.  These are the
"serration pulses" which cause the vertical retrace to occur.  (NTSC timing)

Current Thread
Re: [stella] TIA VSYNC and VBLANK Thomas Jentzsch - 5 Oct 2004 07:05:53 -0000 Adam Wozniak - 5 Oct 2004 16:36:26 -0000 Eric Ball - 5 Oct 2004 19:00:39 -0000 <= Adam Wozniak - 5 Oct 2004 19:35:17 -0000 Eric Ball - 7 Oct 2004 01:57:40 -0000 Adam Wozniak - 7 Oct 2004 02:42:42 -0000 Christopher Tumber - 6 Oct 2004 01:19:44 -0000

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