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Old 21 June 2012, 17:41   #21
roy bates
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well at the end of the day it doesent really matter,if you want perfection you could always buy a 15khz monitor.

and even then it would be ,flicker tastic in interlaced modes.
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Old 21 June 2012, 18:26   #22
BuckoA51
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There are other scalers that can do 50hz 15khz to 50hz 31khz but none are as affordable as GBS 8220.
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Old 21 June 2012, 20:10   #23
Zetr0
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The only bad thing I can say about these converters is that they loose luminosity from their input.

I have had to increase the brightness pickups on the unit a few times for different machines

Spectrums
128k Toast-rack and +2, 128k +2AB and +3

Amstrad
cpc464 / cpc612

Amiga

A500,A600,A2000 and A1200


I have tried a few sets, from my Hitachi 42" Plasma, Orion 19" CRT and Dell 17" LCD monitor.

while the output was a little washed on the LCD, (probably its age) it was pretty damn awesome output on the 42" Plasma...

I will do a recording when I get some time, but there is no tearing or ghosting with any of the connected systems, nor have I felt any delay in response time - and my Project X / Alien Breed playing skills have not been compromised!
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Old 21 June 2012, 20:45   #24
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The lack of brightness could be a cabling or switching issue, are you using a Sync Strike to hook things up or did you wire your own sync splitter?

Frame rate conversion will probably come out as a stutter rather than a tear, as explained above it's impossible for it not to be there, but it's not terrible, my brain just seems susceptible to it I guess.
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Old 21 June 2012, 21:20   #25
Zetr0
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@BuckoA51

One thing that we haven't considered atleast is the pass rate of the adapter or its stepping upto 60Hz from a 50hz source.

There are some truly horrid adapters that are only good for text display, but this is surprisingly good, and amazing for its price range.
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Old 21 June 2012, 21:24   #26
roy bates
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hi zetro,the brightness problem is there in 50hz and 60hz amiga screenmodes.
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Old 21 June 2012, 21:28   #27
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all of the systems I have tested thus far are 50Hz - so that explains the lowered luminosity.

I have yet to try this with my MegaDrive / Playstation / TurboGraphix - all these can be put into 60hz mode.

LOL... if I ever get the time =)
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Old 21 June 2012, 21:57   #28
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Yeah I've seen one in action, they are fantastic for the money close to XRGB3 quality. It should work fine with your 60hz consoles, Megadrive can be a bit hit and miss as it outputs a weird vertical refresh at 60hz especially on PAL modded machines (as does the Amiga!). PC Engine depends on your RGB mod but should be fine.
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Old 10 January 2013, 22:50   #29
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I built one of these awhile back, because I saw those items for sale on ebay, and thought "they must of built that using an existing PCB that converts the output'.

Sure enough, I bought one of the PCB's on ebay, and built it over the course of a weekend. Works great, and doesn't even require separate power (the video output from the 23 pin port has power for that).

One great hack I also did was to take an existing 25 pin serial port, and cut the last 2 pins off so that it would fit in the 23-pin port. Pretty simple if you have a dremel, and much cheaper than buying a real 23-pin adapter for this project.

These units are also great for jamma arcade conversions (that's what they typically are sold as), so you can take a jamma signal, and output to a new VGA flat panel (and do away with the old tube monitor).
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Old 11 January 2013, 00:02   #30
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Quote:
Originally Posted by mojorific View Post
...Works great, and doesn't even require separate power (the video output from the 23 pin port has power for that)...
If you want your Amiga to last long I wouldn't do that. I have this converter and I measured the power usage, and this converter is pulling over 400mA. The spec for the video port 12V out is 100mA, so you are quadrupling your power draw out of the port. So be careful.
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Old 11 January 2013, 02:03   #31
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I was considering one the cased & marked up flicker fixers/ scan doublers, i somehow stumbled upon GBS8200 they compared the pictures.

Compare ebay items 200866221015 & 180833084570, notice the VGA-in, component and button positions

After that, i bought the GBS 8200 whacked a db23 on it and it works 7.5/10 picture quality, but its a step up from the A520 or composite out on a A1200. For the price i cant complain. I want to shield the unit and put ferrite rings on the cable, ill get around to that one day. Basically i use it for testing (since its external), and my good amiga has a aga mk2.

Use external power supply only. Im using a 5V 2A pack i found, a 5V 500ma pack was too low.
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