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The next big conversion?

rewrite said:
Bootlegs/repro's/something would make a lot more sense than a multi. SH3 CPU's got discontinued, and finding them in large quantities isn't terribly easy.
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There is an open source implementation of the SuperH instruction set: http://j-core.org/index.html
They implement SH-2 and some SH-3 instructions that are not covered by patents, though I have no idea if it is possible to reach the required performance of the 133Mhz SH-3 on an FPGA board.
 
rewrite said:
Fluffy said:
Of course, looking at the cost of the originals and that they're using mostly off-the-shelf hardware I'm surprised that there aren't many bootlegs?
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The sound ROMs would still need to be desoldered, reprogrammed, and soldered back down every time you converted a game.

Bootlegs/repro's/something would make a lot more sense than a multi. SH3 CPU's got discontinued, and finding them in large quantities isn't terribly easy.
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What about these? http://j-core.org/roadmap.html

Says the J3 is/will be SH3 compatible. Not sure if it's actually been manufactured or not.
 
connor said:
What about these? http://j-core.org/roadmap.html
Says the J3 is/will be SH3 compatible. Not sure if it's actually been manufactured or not.
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There don't seem to be changes since 2016, so most likely dead...

I think a bootleg is possible if you can secure a few hundred of the required CPUs ( 6417709S-133 ) and are able to layout/manufacture PCBs suitable for that speed...
 
Fluffy said:
They implement SH-2 and some SH-3 instructions that are not covered by patents, though I have no idea if it is possible to reach the required performance of the 133Mhz SH-3 on an FPGA board.
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I'm not sure either. Sure would be nice though!

I was just giving a partial reason as to why bootlegs weren't really a thing.
 
rewrite said:
I was just giving a partial reason as to why bootlegs weren't really a thing.
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... and I'm just throwing ideas at the wall how more people can get access to games based on cave hardware. ;) I'm considering a bigger project after the PGM boards, but I don't think I can design for higher clock speeds.
 
Fluffy said:
rewrite said:
I was just giving a partial reason as to why bootlegs weren't really a thing.
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... and I'm just throwing ideas at the wall how more people can get access to games based on cave hardware. ;) I'm considering a bigger project after the PGM boards, but I don't think I can design for higher clock speeds.
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In the event you move forward with this, I've a CV1000 PCB I'd be willing to lend out (and wouldn't be devastated if anything happened to it in the process).
 
rewrite said:
In the event you move forward with this, I've a CV1000 PCB I'd be willing to lend out (and wouldn't be devastated if anything happened to it in the process).
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Thanks for the offer, but at the moment this is probably outside my skill range...
 
This is probably a good discussion for one of the other cave multi threads, lets not hijack Hammy's thread :P
 
@Hammy I’m not 100% what the donor board for this is, but I most likely have it. So I would be willing to test :D
 
I can't afford a gun nail so you don't have a chance in hell of cave conversions coming out of this laboratory.
The best cave game is steep slope sliders anyway. best snowboarding game of all time. Give it a try on the STV, you won't be disappointed.

Regarding this nmk conversion, it looks like the resolution is a 'regular' conversion requirement.
Next to fix the i/o to continue with the rom patching.

There is no donor board as nothing works yet?
Any game is better than macross with no sprites, no sound or coin input ( and backgrounds that turn bad ) so there is nothing to be missed at the moment.
 
*bad joke*
 
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