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Got a MEGA ST2 today... with a fascinating JRI Genlock system
Posted: 03 Feb 2021 01:38
by 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!
Re: Got a MEGA ST2 today... with a fascinating JRI Genlock system
Posted: 03 Feb 2021 07:50
by exxos
Re: Got a MEGA ST2 today... with a fascinating JRI Genlock system
Posted: 03 Feb 2021 11:14
by 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.
Re: Got a MEGA ST2 today... with a fascinating JRI Genlock system
Posted: 03 Feb 2021 11:38
by Steve
Will be nice to see some Atari overlaid graphics, perhaps you could make something and upload to youtube :)
Re: Got a MEGA ST2 today... with a fascinating JRI Genlock system
Posted: 03 Feb 2021 12:42
by 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?
Re: Got a MEGA ST2 today... with a fascinating JRI Genlock system
Posted: 03 Feb 2021 13:40
by stephen_usher
Wasn't the SST the board which killed Gadgets by Small due to legal costs over defective chips?
Re: Got a MEGA ST2 today... with a fascinating JRI Genlock system
Posted: 03 Feb 2021 14:41
by mrbombermillzy
If Im not mistaken, theres an ST Shifter on one of those boards...
Does that machine have the JRI4096 board?!
Re: Got a MEGA ST2 today... with a fascinating JRI Genlock system
Posted: 03 Feb 2021 16:27
by DominoTree
mrbombermillzy wrote: 03 Feb 2021 14:41
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
Re: Got a MEGA ST2 today... with a fascinating JRI Genlock system
Posted: 03 Feb 2021 16:29
by DominoTree
derkom wrote: 03 Feb 2021 12:42
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.
Re: Got a MEGA ST2 today... with a fascinating JRI Genlock system
Posted: 05 Feb 2021 20:19
by 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?