Search found 1174 matches

by Fisher
Tue May 11, 2021 3:24 pm
Forum: Newbie Help Center
Topic: Adding DB9 port for controller 1 to Power Joy
Replies: 10
Views: 4877

Re: Adding DB9 port for controller 1 to Power Joy

zcDRDzK1.jpeg
I think the input pins of the controller IC may be these 3 marked in red.
I really would like to hear the opinion of more experienced users, like Lidnariq and Krzysiobal.
by Fisher
Tue May 11, 2021 6:56 am
Forum: Newbie Help Center
Topic: Adding DB9 port for controller 1 to Power Joy
Replies: 10
Views: 4877

Re: Adding DB9 port for controller 1 to Power Joy

Could you please take a better picture focusing the small blob that seems to be connected to the d-pad and the 2nd controller connector?
That blob seems to be like the controller IC, maybe it's possible to add the port by picking the tracks that go to it.
by Fisher
Sun Apr 25, 2021 3:25 pm
Forum: Reproduction
Topic: [SOLVED] Can't fix CHR pinswap problem
Replies: 5
Views: 2933

Re: Can't fix CHR pinswap problem

After doing the file preparation, erasing, and programming the EPROM again everything went fine.
Not sure what I did wrong, but now it's all fine now.
Thank you. :-)
by Fisher
Sat Apr 24, 2021 7:52 pm
Forum: Reproduction
Topic: [SOLVED] Can't fix CHR pinswap problem
Replies: 5
Views: 2933

Re: Can't fix CHR pinswap problem

Did the said swaps. Things are better, but not perfect. Did I mess with all the 6 swaps? It seems so. :oops: 20210424_233416.jpg 20210424_233443.jpg These are the swaps I was supposed to do: CHR O A A12=A7 A11=A10 A10=A12 A9 =A11 A8 =A9 A7 =A8 Looks like it didn't swap anything! :shock: Tomorrow, I'...
by Fisher
Sat Apr 24, 2021 5:08 pm
Forum: Reproduction
Topic: [SOLVED] Can't fix CHR pinswap problem
Replies: 5
Views: 2933

Re: Can't fix CHR pinswap problem

They're the wrong tiles.
I'll post pictures of the screen, hopefully I won't be making the developers angry:
20210424_174245.jpg
20210424_174029.jpg
by Fisher
Sat Apr 24, 2021 3:59 pm
Forum: Reproduction
Topic: [SOLVED] Can't fix CHR pinswap problem
Replies: 5
Views: 2933

[SOLVED] Can't fix CHR pinswap problem

Hi. A friend of mine asked me to do a repro of a NROM game he bought. Since it's a commercial game that's being sold, I think it's better to not post the ROMs or pictures. He bringed me this UNROM PCB: 20210422_091334.jpg 20210422_091353.jpg So far so good, the ROM pins are swapped. I took a look an...
by Fisher
Mon Apr 19, 2021 2:45 pm
Forum: Reproduction
Topic: Help to find mistake for Circuit with NO SRAM
Replies: 22
Views: 13348

Re: Help to find mistake for Circuit with NO SRAM

Oops!
Looks like I misread it again.
I saw each mux selecting 8 bits out of 16, but in fact they're selecting 4 ou of 8. :oops:
by Fisher
Mon Apr 19, 2021 9:18 am
Forum: Reproduction
Topic: Help to find mistake for Circuit with NO SRAM
Replies: 22
Views: 13348

Re: Help to find mistake for Circuit with NO SRAM

Taking a better look at the schematics, shouldn't you be enabling only one of the multiplexers?
It looks like both are being enabled and having their output connected to the bus at the same time.
Maybe I'm not understanding it totally, but isn't a not gate needed in this case?
by Fisher
Sat Apr 17, 2021 6:46 am
Forum: Newbie Help Center
Topic: help with MMC1 repro
Replies: 5
Views: 4157

Re: help with MMC1 repro

krzysiobal wrote:
Thu Apr 15, 2021 3:44 pm
I made special adapter for that purposes (one side, so can be etched at home!):
Wow!
That's cool.
Thanks for sharing. :-)
by Fisher
Sat Apr 17, 2021 6:40 am
Forum: General Stuff
Topic: SNES multicart worth fixing?
Replies: 19
Views: 10713

Re: SNES multicart worth fixing?

I did a small discovery that I would like to share. Sometimes, in single games with multiple "bubbles", the demux is incorporated on the CIC clone. If for some reason this IC doesn't work and the "ROMs" are fine, it's possible to add an external demux by cutting the tracks that go to the bubbles' /C...
by Fisher
Thu Apr 15, 2021 4:48 am
Forum: Newbie Help Center
Topic: help with MMC1 repro
Replies: 5
Views: 4157

Re: help with MMC1 repro

I had a similar problem and solved it by soldering the IC under the board like this: 20160801_160227.jpg Since then, I've been using PLCC ICs, which normally don't give me these kinds of problems, but the end result is something like this: 6e6fc187-469c-4973-8907-d4290c137088.jpg Of course, there ar...
by Fisher
Sun Apr 11, 2021 6:47 pm
Forum: Reproduction
Topic: Help to find mistake for Circuit with NO SRAM
Replies: 22
Views: 13348

Re: Help to find mistake for Circuit with NO SRAM

The only time I saw something similar was when a guy suggested cutting one of the ROM pins to make it work fine with a SNES' Game Genie. In the end, I figured out that a small resistor mod would do the job better and not cause any kind of damage to the cartridges. Maybe the circuit just needs a pull...
by Fisher
Sun Apr 11, 2021 6:28 pm
Forum: NES Hardware and Flash Equipment
Topic: Short pads on certain carts
Replies: 1
Views: 2789

Re: Short pads on certain carts

I remember to have read somewhere that this could probably be related to the PCBs being made at the edge of a big manufacturing PCB, but I simply can't find the place where I've read it! I had one Return to the Earth, which I used to make a repro of Double Dragon II that has a similar "feature". It ...
by Fisher
Sat Apr 10, 2021 5:58 am
Forum: SNESdev
Topic: SNES oscilloscope readings?
Replies: 30
Views: 8725

Re: SNES oscilloscope readings?

I think pin compatible substitution packages will soon become a thing. IMG-20210326-WA0175.jpg This picture was taken ata a guy's workshop and posted on a Whatsapp group. These are the results of a few weeks of work, according to the guy. That's the result of fixing 162 consoles. He claims to have a...
by Fisher
Fri Mar 26, 2021 9:18 am
Forum: Reproduction
Topic: schematic DSP-1, DSP-2, DSP-3, DSP-4
Replies: 21
Views: 9950

Re: schematic DSP-1, DSP-2, DSP-3, DSP-4

I think the eraseable windowed ones are the way to go, at least until you know exactly what an how to write it. :wink: