25 Mar
2005
25 Mar
'05
11:15 a.m.
On Thu, 24 Mar 2005 18:55:02 -0500, Christian R. Fandt
<cfandt at netsync.net> wrote:
Just last week in one of my occasional searches for a
video solution, I
found this RGB-to-VGA adapter product:
http://www.magenta-research.com/products/products/product_set3/VideoAdapter…
Hmmm, yeah. Just right!
So, I inquired about the price. They emailed back $695.00 (gulp!!!) Take
a look at that little thing! $695??
What's the horizontal scan rate? Is it sync on green (RGsB), separate
composite sync,
or separate sync?
If the horizontal rate is above 30 kHz, it's probably going to work OK
with a VGA monitor. All you need to do is get the sync separated. A
small circuit board with an LM1881, an 74LS00 and a few resistors and
capacitors should to the job.
I recently built a sync combiner separater for a bunch of 15 kHz
horizontal machines that are video switched. Some have composite
sync, some have separate. I can send the schematic if anyone is
interested.
If they have scan rates below 30kHz you'll need a scan doubler. For
15 kHz Horz, 60Hz vert machines you can get a board from Atlas
Amusements that will do the job. (They call it their CGA to VGA
converter, but it's really an analog 15kHz RGB to VGA converter. The
price is about $100. They sell it for installation in arcade video
games.)
Eric