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Old 05-27-2020, 04:11 AM   #1
japlytic
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Question Sync frequencies and polarities for non-PC workstations

I am currently building a video sync trigger which can automatically determine a video mode based on sync polarity, line count and Vertical frequency, so therefore, I am after sync frequencies (three decimal places is ideal) and polarities for HP/DEC/VAX/Apollo/SGI/Sun and other non-PC workstations along with the Apple Portrait Display (640x870).
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Old 05-27-2020, 10:53 AM   #2
Curious.George
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Default Re: Sync frequencies and polarities for non-PC workstations

Quote:
Originally Posted by japlytic View Post
I am currently building a video sync trigger which can automatically determine a video mode based on sync polarity, line count and Vertical frequency, so therefore, I am after sync frequencies (three decimal places is ideal) and polarities for HP/DEC/VAX/Apollo/SGI/Sun and other non-PC workstations along with the Apple Portrait Display (640x870).
X Windows monitor database?
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Old 05-29-2020, 03:32 AM   #3
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Default Re: Sync frequencies and polarities for non-PC workstations

This database was helpful; in this database, the only two monitors which were not multi-synchronous were both Apollo while many of the monitors for workstations in this database were multi-synchronous which came out in the early to mid-80s.

According to a Sony DDM-2801 service manual (which this model was mentioned in an article reprint (How to Drive 4-Mpixel Displays, Electronic Design, 3/89) in the 1990 Brooktree Graphics and Imaging Products Applications Handbook), the 2048x2048 60Hz resolution has 2114 lines with -/- H/V sync polarities.
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