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Messages - GadgetUK

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EverDrive N8 / Re: Games Not Working / Bug Reporting Thread
« on: September 02, 2016, 03:35 PM »
Space Shuttle Project (USA); the graphic of the Space Shuttle at the very beginning is all screwed up.

This is still an issue ... for whatever reason.

I noticed the scrambled graphics last night ... again.
I think its an issue related to mirroring - I could be wrong, but it looks that way (notice how if you reset it sometimes the bottom half of the shuttle is OK).  I think Mapper 1 gives control to the program over H or V mirroring and I think that probably is used in this game.  I did notice that Adams Family seems to work using the same mapper and the cart DB seems to suggest that has control over mirroring as well but I am not sure without digging into the ROM code to see if that game uses it, or if that has a similar problem or not.

Did you see the follow up part - adding copper tape over the traces and vias going to the cart edge?  I suspect it might need doing on the NT side rather than on the ED, but it might help at either side.  I've had 4 people say this solved their problems with the 72 pin to 60 pin adapter.   The resistor and cap stuff was me testing prior to the copper tape solution.

EverDrive N8 / Re: Nes (72-pin) to Famicom (60-pin) converter mod
« on: August 29, 2016, 11:30 AM »
That's great news!  Fascinating your cart needed grounding in 3 places, very odd.  I would have expected ground to be ground, unless one of your vias is introducing resistance or something - maybe a bad via?  In any case this makes 4 counts of it solving all the problems now!  Thanks for doing the mod, and for sharing your experiences related to grounding on the AV Famicom.

EverDrive N8 / Re: Did I get ripped off?
« on: August 28, 2016, 03:44 PM »
Interesting point here - If you buy something like this off eBay, you can contact eBay with proof its a clone (which isn't difficult, just post pictures of the board vs the original Krikkz hardware) and you are entitled to keep the product and a full refund from the seller.   eBay doesn't allow counterfit products, so a clone is exactly that - if described as an original Everdrive.   At that point I would smash the f******* cart up and just buy one from a proper reseller.

EverDrive N8 / Re: Nes (72-pin) to Famicom (60-pin) converter mod
« on: August 28, 2016, 01:02 PM »
Yes, ground is pin 1 or pin 72 on the 72 pin connector!

EverDrive N8 / Re: Nes (72-pin) to Famicom (60-pin) converter mod
« on: August 28, 2016, 10:54 AM »
That's awesome news!!!  Thanks for posting!  =D

EverDrive N8 / Re: Nes (72-pin) to Famicom (60-pin) converter mod
« on: August 28, 2016, 01:54 AM »
Make sure you smooth the ripples out of the tape as well - just rub over it with tissue or something to flatten it and remove ripples.  Strange that you've still got a problem with Metroid, maybe the 100ohm resistor on the M2 line (and isolation of the existing M2 trace) is required after all.  I cannot get mine to glitch at all now and Metroid works fine for me.  With regards to not being able to solder onto the scratched off ground trace - it sounds like you need some flux!   Thanks for testing!  I've heard from a friend that his is working perfectly also, so it's looking promising!

See these as reference.  This is the cart end obviously, but you might need to do this on the NT mobo - hard to tell which end is best to add the tape.   So in order to work out where your ground pin is on the NT mobo end just apply a bit of logic - ie. look at how the cart plugs into the NT and then you can work out the pin on the mobo vs these photos.

I tried adding as attachments but apparently the upload folder is full =/

Also check you aren't shorting anything with the copper tape before you power it up.  If you don't feel comfortable doing this test it might be better off leaving it to someone else!

EDIT: Make sure your Copper tape as an insulated sticky back as well, otherwise you will short out vias.

When I say ground, I am talking about the -ve return path, not earth on mains outlet.  Pin 1 on 60 pin socket, or pin 72 on 72 pin socket.  Do you have a multimeter to test with?

If the grounding plate is really grounded - connected to the -ve DC connection, then that should be fine.  It probably will be!  Just put your multimeter on connectivity test and measure around.  If you try putting the copper tape over the traces and vias on the NT board itself, you could always solder a wire directly to the ground pin on the 72 pin or 60 pin sockets - just check continuity to make sure you are connecting to ground.  Might be easier to try at the Everdrive end first, but not sure if that will be easy or not - I've not seen the Everdrive PCB to see where it might be possible to stick the tape, but looking at images of the NT motherboard I see all the cart traces and vias leading to / from the cart sockets, so that looks a good candidate to me.

I don't think there's a design issue with either device, if there is cross talk its purely a case of 2 modern devices, each primarily designed to work with older hardware, and stick them together and you've possibly got a cross talk issue.

EverDrive N8 / Re: N8 testing with Analogue NT
« on: August 26, 2016, 11:57 AM »
To be honest, FGPA emulation gets a bad reputation - namely because of devices like the firecore Atgames junk and similar 'thrown together untested pieces of ****'.  If Kevtris is behind the core design you've got nothing to worry about.  His attention to detail is probably in the top 0.1% of the people on the planet when it comes to this area of expertise.   I wish I had 1% of his ability in the field of FPGA.   The nice thing with the NES its is pretty well reverse engineered - there's  not much if anything not known about its internals.  Emulating the CPU can easily be done perfectly, and emulating the PPU at hardware level in an FPGA isn't a problem for someone like Kevtris either.

That said, I do personally prefer original hardware.  There's the point in my mind where I believe that if I am emulating at FPGA level, why not just emulate in software?  Sure you get better accuracy vs original hardware, but it ISNT the original hardware.  Sure you can play original games, but the game is just binary at the end of the day, it's not the cart that makes the experience and give you that retro fuzzy feeling - its the hardware running it.   That's my personal gripe with FPGA remakes of systems - It's easier, cheaper and more logical to just emulate instead.   Hybrids I can see real benefits in.  ie. hooking up FPGA hardware that allows original CPU and PPU, but allows you to disable them and swap to virtual chips, to allow things like different clock speeds (NTSC / PAL), HDMI video etc etc.

EDIT:  Yes, your points about some Mappers being inaccurate - absolutely!  When it comes to the sound components I am sure there's room for improvement.  Part of the problem there is the internals aren't 100% understood I think, for some mappers.  And analogue components (sound generation etc) is sometimes a bit tricky with just an FPGA, and ends up sounding a little sharp and maybe even digital to the trained ear.

Don't write off the NT with the N8 though, it sounds like cross talk.  I've read all the issues that people have been posting on these threads and I am sure that's what it is.   Grounded copper tape on the right place (over cart traces and vias) could bring you stability with this combination of hardware.  It's probably impedance related, and these types of problems aren't always easy to spot when testing at design stage.

Your point there about it working when you added your own bodies capacitance (and affected the return path) is even more evidence that its a cross talk related issue.  Try what I've suggested!

The fact you get random results adds weight to the likelyhood of cross talk being the problem.  See my comment above about adding grounded copper tape over the cart traces and vias (at either end).  That might fix your problem.

EverDrive N8 / Re: N8 testing with Analogue NT
« on: August 24, 2016, 11:20 AM »
Again, sorry to spam my suggestion but I believe you are seeing a cross talk issue.  Try adding grounded copper tape over the cart interface traces and vias - either in the Everdrive or on the NT PCB.  This could make a difference!  Wish I had one to test =\

Sorry to spam about this idea, but someone should try adding some grounded copper tape over the cart interface traces, either on the everdrive (might be easiest), or on the NT mainboard.  I suspect cross talk, possibly due to impedance.

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