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GreenAntz RGB to component transcoder
TheArcaveProject:
Hello, New to the forum ran into your product looking for this exact solution(needing Jamma CGA to Component!). I will be needing 2 will send you a PM. :)
Cadams84:
are you still selling these by chance? I'm looking for something cheaper than the $76 it will cost me to get the Wakabavideo Transcoder. Plus shipping take forever for them to get here. shipping would be to Tennessee if you wouldn't mind giving me an out the door price total!
Zebidee:
Starting 2025, GreenAntz is $50. Plus courier cost.
I have a couple of VGA GreenAntz units available, so I'll check them over and send you the best one - I'm currently neck-deep in diagnosing CRT TV horizontal deflection issues, so will send on Monday if you don't mind (Friday morning here). From then USPS say 7-10 days, but I'd say ~2 weeks. So, can't promise it'll be any quicker than the one from NZ.
Talk more via PM.
--- Quote from: Cadams84 on February 06, 2025, 09:42:50 am ---are you still selling these by chance? I'm looking for something cheaper than the $76 it will cost me to get the Wakabavideo Transcoder. Plus shipping take forever for them to get here. shipping would be to Tennessee if you wouldn't mind giving me an out the door price total!
--- End quote ---
hamadam:
Thanks for doing this and all the information!
Zebidee:
I found a "bug" with CRT-emudriver's composite sync and the GreenAntz v1.94 composite sync autodetection.
When using CRT_emudriver to generate composite sync (on the H-sync output, VGA pin 13), the driver continues to output normal V sync (VGA pin 14). This makes the sync logic think there is HV sync input, the dual V and composite inputs conflict, and results in an inverted composite sync signal. No stable picture most of the time.
This is not strictly a GreenAntz bug. The issue affects not only GreenAntz v1.94, but also all three of my wakabavideo transcoders and my Bitfunx clonecoder (it is a clone of an early pre-GreenAntz design, ripped from my mate's github). So it seems to be a common problem.
The only transcoder it doesn't affect are my older GreenAntz with the manual slide-switch to select sync input (HV or C).
Anyway, I have a solution for GreenAntz v1.94 owners - I think this "bug" has affected at least one other person. But first, here are some before/after pics to demonstrate what I mean.
On the left side we have GreenAntz v1.94 with buggy sync input, as described above. Note it outputs incorrectly inverted sync. Refer the oscilloscope feed (Y), showing inverted horizontal sync and no vertical sync pulse. On the GreenAntz, note that the sync LED (blue, left) is only weakly lit.
On the right side we have the same GreenAntz v1.94, same buggy sync input, outputting correct composite sync. As can be seen on the 'scope feed the horizontal pulses are in the right direction (down) and vertical pulse is present (marked with a star). Sync LED is brightly lit.
The easy way to solve this, no soldering, is to take a wire with two male pointy ends, like this dupont/arduino wire. I've got a bunch of these wires in different formats (male/female/colours etc). Anyway, you might notice that I've lightly bent the ends with some pliers.
Then use the wire to "blank" out the V-sync input by "pulling it up". That means connecting the GreenAntz Vcc (about 4.7v) to the V-sync input. Access the Vcc from the corner of the unused LM1881 footprint (pin 8 ), and then just connect the other end to unused resistor R22 (V term) footprint, as shown below. The two holes are unused in v1.94 (VGA). With the ends of the dupont wire slightly bent, and the natural springiness of the wire, it should just sit in place.
I hope the two spots I've described, as pictured, are easy enough to find.
This solution forces the GreenAntz into Csync mode. The wire is only loosely in place, but you can revert back to normal by just removing it. You can solder it in but that would be permanent. If you solder a post onto R22 then you could take a male/female arduino wire, solder the male onto the Vcc at LM1881 and connect the female end to the post. Ideally you could put a 1k resistor in series onto the wire, but this is not necessary.
Hope this helps.
Hardware used is a PC running Windows 7 x64 with HD6450 GPU and CRT_emudriver. Video ouput via VGA/GreenAntz to Sony TV component input.