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 Post subject: Re: CPS2 digital AV interface
PostPosted: Mon Feb 12, 2018 12:31 am 



Joined: 05 Aug 2017
Posts: 8
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I have a question regarding how to hand-solder the ground (41) underneath the FPGA. I placed solder in the hole exposed underneath the board, but I've a feeling this isn't how you are supposed to do it (see picture above).

I've a feeling this board isn't going to work due to my soldering skills, but it has been an education nonetheless.


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 Post subject: Re: CPS2 digital AV interface
PostPosted: Mon Feb 12, 2018 6:31 pm 


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Joined: 25 Dec 2013
Posts: 516
Location: Indiana
You should be able to get solder to flow down that large hole.

I'm not sure what tools you have, but I normally put solder paste on. Set the chip down and tack a few legs. And then use hot air or iron on the bottom side.


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 Post subject: Re: CPS2 digital AV interface
PostPosted: Sun Feb 18, 2018 9:10 am 


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Joined: 15 Dec 2012
Posts: 530
Location: Finland
mikejmoffitt wrote:
The main issue is for HDMI audio you have digital audio as well as analogue audio coming from the YM2610. It would maybe be easier to just reimplement the SSG portion of that chip in HDL and tap the bus, to avoid having to do ADC.
From a quick glance that'd require tapping quite many pins. A separate Neo-Geo specific daughterboard which would combine and encode audio into I2S could do the job until/unless someone forks/creates a dedicated Neo-Geo digital AV mod.


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 Post subject: Re: CPS2 digital AV interface
PostPosted: Sun Feb 18, 2018 9:14 am 


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Joined: 15 Dec 2012
Posts: 530
Location: Finland
xterc wrote:
I have a question regarding how to hand-solder the ground (41) underneath the FPGA. I placed solder in the hole exposed underneath the board, but I've a feeling this isn't how you are supposed to do it (see picture above).

I've a feeling this board isn't going to work due to my soldering skills, but it has been an education nonetheless.
Getting a good connection on the bottom pad is hard as its underneath area is part of a big ground plane, but it's crucial as without it the FPGA doesn't work reliably or at all.


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 Post subject: Re: CPS2 digital AV interface
PostPosted: Wed Mar 07, 2018 4:48 am 


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Joined: 19 Oct 2013
Posts: 268
Any update on the revised board?


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 Post subject: Re: CPS2 digital AV interface
PostPosted: Sat Mar 10, 2018 3:13 pm 


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Joined: 15 Dec 2012
Posts: 530
Location: Finland
cr4zymanz0r wrote:
Any update on the revised board?
Schematic was finished a few weeks ago, now I just have to complete the layout. There's also been a different ideas to help installation, one suggested by DewmanSNK on the previous page and one with a helper PCB around M5M RAM chips.


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 Post subject: Re: CPS2 digital AV interface
PostPosted: Wed Apr 04, 2018 9:51 pm 


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Joined: 15 Dec 2012
Posts: 530
Location: Finland
The PCB design is almost finished now. I took a couple mockup pictures to demonstrate the planned mounting method. It involves soldering a pair of HLE-105-02-G-DV-PE passthru sockets on top of M5M chips, and a pair of HLE-105-02-G-DV-PE-LCs on matching position on top of scanconverter PCB (which has cutouts for bottom sockets).That should provide easily detachable yet reliable installation method for the mod.


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 Post subject: Re: CPS2 digital AV interface
PostPosted: Thu Apr 05, 2018 8:17 am 


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Joined: 19 Oct 2013
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 Post subject: Re: CPS2 digital AV interface
PostPosted: Thu May 10, 2018 9:26 am 


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Joined: 15 Dec 2012
Posts: 530
Location: Finland
The PCBs have arrived, more images below to illustrate the installation method.

HLE-105-02-G-DV-PE sockets soldered on top of M5Ms:
Spoiler: show
Image

PCB lies in level with the mainboard:
Spoiler: show
Image

Picture from top:
Spoiler: show
Image

Picture from top, another set of HLE-105-02-G-DV-PEs (or HLE-105-02-G-DV-PE-LCs) and HDMI connector placed on PCB:
Spoiler: show
Image

HDMI connector on the same level as mounting tab next to it:
Spoiler: show
Image

Required cutout for CPS2 plastic case:
Spoiler: show
Image

Case closed:
Spoiler: show
Image


Rest of the components should arrive next week after which testing can begin. Unfortunately ADV7513 is no more available from trusted suppliers (technically it's on Mouser's and Digikey's inventory, but former requires you to be a HDMI licensee and latter has large minimum order quantity), so one needs to resort to other sources with that.


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 Post subject: Re: CPS2 digital AV interface
PostPosted: Fri May 11, 2018 12:43 am 


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Joined: 19 Oct 2013
Posts: 268
I want one of these soooo bad.


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 Post subject: Re: CPS2 digital AV interface
PostPosted: Sat Jun 02, 2018 12:14 am 



Joined: 02 Jun 2018
Posts: 1
/\ Same, if possible, I would like to purchase one as well when the new revision is complete :)


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 Post subject: Re: CPS2 digital AV interface
PostPosted: Sat Jun 09, 2018 8:21 am 


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Joined: 15 Dec 2012
Posts: 530
Location: Finland
I've been playing with the new prototype for a while and so far it's been working well. With 40 line buffers (40 out of 66 M9Ks) reserved for coping with line count differences of source and output modes, the board is now able to output "normalized" 1080p at 59.64Hz :) .


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 Post subject: Re: CPS2 digital AV interface
PostPosted: Sat Jun 09, 2018 11:27 am 



Joined: 05 Aug 2017
Posts: 8
Sounds awesome. Will the new firmware work on the original board?


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 Post subject: Re: CPS2 digital AV interface
PostPosted: Mon Jun 11, 2018 2:43 pm 


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Joined: 15 Dec 2012
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Location: Finland
xterc wrote:
Sounds awesome. Will the new firmware work on the original board?
No, it's specific for the new board. Some features might be back-portable but considering the limited number of original boards in use, it's probably not worth the effort.


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 Post subject: Re: CPS2 digital AV interface
PostPosted: Mon Jun 11, 2018 3:50 pm 


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Joined: 25 Dec 2013
Posts: 516
Location: Indiana
Great engineering and work marq's. Install method looks perfect.


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 Post subject: Re: CPS2 digital AV interface
PostPosted: Tue Jun 19, 2018 10:44 am 



Joined: 01 Jan 2018
Posts: 7
I can see why you made the board stick out to the side for the HDMI port but I would have preferred to have run the HDMI cable out one of the round plug holes rather than having to cut the case up to fit it.

Any chance of a revision where this wont be necessary?

Nonetheless I still think this is great mod, what will the price be on one of these?


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 Post subject: Re: CPS2 digital AV interface
PostPosted: Tue Jun 19, 2018 3:28 pm 


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Joined: 29 Jan 2005
Posts: 3262
Location: Phoenix
The Spaniard wrote:
I can see why you made the board stick out to the side for the HDMI port but I would have preferred to have run the HDMI cable out one of the round plug holes rather than having to cut the case up to fit it.

Any chance of a revision where this wont be necessary?

Nonetheless I still think this is great mod, what will the price be on one of these?

This board gets installed in the A (system) board. Only the B (game) board has the round hole plugs.
-ud
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 Post subject: Re: CPS2 digital AV interface
PostPosted: Wed Jun 20, 2018 11:28 am 



Joined: 01 Jan 2018
Posts: 7
undamned wrote:
The Spaniard wrote:
I can see why you made the board stick out to the side for the HDMI port but I would have preferred to have run the HDMI cable out one of the round plug holes rather than having to cut the case up to fit it.

Any chance of a revision where this wont be necessary?

Nonetheless I still think this is great mod, what will the price be on one of these?

This board gets installed in the A (system) board. Only the B (game) board has the round hole plugs.
-ud


Haha ok my bad. Had my mind thinking of the B board and installing the multi so didnt even think about it being installed on the A board.


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