[rescue] Fwd: Sun 13w3 to VGA to HDMI

[Jonathan Patschke]

On Wed, 13 Oct 2021, Mike Spooner wrote:

> IIRC, all the early Sun colour framebuffers (CG3, CG6, CG12, GT, etc) were
> composite-sync-on-green, as were the Sun CRTs.

Combposite sync, yes, but on a dedicated pin.  It's why the Sun BNC
monitors of the era had four connectors.  SGI and RS/6000 did sync-on-green.

*Some* Sun-branded monitors could cope with having sync on the green
pin, but some could not.   The impressive-looking one based on the Sony
GDM-20D10 could not--even though the SGI monitor based off the same
design could.

For quite a while, I had a goofy setup where I ran my Suns connected to
an SGI monitor using a 13w3->4BNC connector on the Sun end, a BNC
T-connector to join Sync and Green, barrel-couplers for Red and Blue,
and a 13w3->3BNC connector on the monitor end.  It meant that none of my
Sun systems could auto-set a resolution based on the monitor (provided
the framebuffer was new enough to even try such a thing), but it meant
having one fewer montior on the bench,

-- 
Jonathan Patschke
Austin, TX
USA