Got a MEGA ST2 today... with a fascinating JRI Genlock system

[DominoTree]

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What's this sticker on the front?

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We have some interesting ports here

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Better view of the ports along with the connector tying into the native display output

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It boots and looks good!

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The whole setup

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Demo unit 5 sent to B&C Computervisions?

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It's plugged into the shifter socket!

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This little connector appears to be made of some sort of resin

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Front side of the display connector

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Once we remove the board with the fan, conformal coating EVERYWHERE! Thick, sturdy, nasty stuff.

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Some poor soul had to scrape all of this away and do bodge work

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And more bodge work

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Beneath the board, we have a bone stock MEGA ST2 rev5 with Blitter and no clock patch

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The bottom of the board with traces, more bodge work, and our DMA chip

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The remote control... made of real wood!

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And here we have some sort of SMPTE interface that seems to have connections for the serial port and a mouse/joystick port?!

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The bottom of the interface


That's all for now folks! I don't have any video hardware available to do any further testing here, but I'm hoping to get what I need to play around with this Genlock system soon!

[exxos]

Cool!

Found a bit of info here https://www.atarimagazines.com/startv5n ... glink.html

[rubber_jonnie]

I saw your post on FB too, and at first I thought surely it's got to be plugged into the Megabus slot. But no!

Always nice to see unusual hardware out in the wild, and nice to see a big button Mega as well.

[Steve]

Will be nice to see some Atari overlaid graphics, perhaps you could make something and upload to youtube

[derkom]

Back in the day, I had a Mega 4 with a JRI Genlock board and also a Gadgets by Small SST. Very sorry I got rid of that, but it paid for my Falcon.

The JRI was a very nice board, and the overlay image quality was superb. Definitely professional quality gear.

Is this one working?

[stephen_usher]

Wasn't the SST the board which killed Gadgets by Small due to legal costs over defective chips?

[mrbombermillzy]

If Im not mistaken, theres an ST Shifter on one of those boards...

Does that machine have the JRI4096 board?!

[DominoTree]

If Im not mistaken, theres an ST Shifter on one of those boards...

Does that machine have the JRI4096 board?!

I misspoke and said it was a DMA chip but it's definitely a shifter. The reason it's there is because the Genlock plugs into its socket on the ST, so the shifter gets moved to the Genlock and lives there

[DominoTree]

Back in the day, I had a Mega 4 with a JRI Genlock board and also a Gadgets by Small SST. Very sorry I got rid of that, but it paid for my Falcon.

The JRI was a very nice board, and the overlay image quality was superb. Definitely professional quality gear.

Is this one working?

It's working-ish. There's some signal distortion, but I have a feeling some general cleanup (cleaning/replacing pots and such) will resolve it. The MEGA is doing a few Weird Things(tm) as well but I still need to go over it too.

[mrbombermillzy]

I dont suppose all that stuff in there, or indeed time has borked the (presumably original) PSU a bit which may be causing some of the issues?