Search found 1249 matches

by Fisher
Tue Mar 05, 2024 7:14 am
Forum: NES Hardware and Flash Equipment
Topic: Weird 15 in 1 Cartridge
Replies: 13
Views: 994

Re: Weird 15 in 1 Cartridge

Hello.
The seller contacted me and told me the cartridge had a menu.
So, another reason to try to dump the missing ROM, the menu should be there, should it?
by Fisher
Wed Feb 28, 2024 5:07 pm
Forum: NES Hardware and Flash Equipment
Topic: Weird 15 in 1 Cartridge
Replies: 13
Views: 994

Re: Weird 15 in 1 Cartridge

Though this ROM contains only games, no menu, so I hope it is not stricly neccessary: That's exactly my last doubt about this cartridge. I also have this question: if there's a menu, where is the code of it? I talked to the guy who sold it to me and he's not sure if it had a menu, he only remembers...
by Fisher
Tue Feb 27, 2024 5:37 pm
Forum: NES Hardware and Flash Equipment
Topic: Weird 15 in 1 Cartridge
Replies: 13
Views: 994

Re: Weird 15 in 1 Cartridge

Ok. I tried to dump them again and got the same results. The good news is that I found a way to make my programmer read these kinds of ROMs. It shows a problem with pin 15 of the "A" ROM. Looks like this was the original problem of this cartridge. Since this pin is stuck on Vcc, I did try ...
by Fisher
Mon Feb 26, 2024 6:42 pm
Forum: NES Hardware and Flash Equipment
Topic: Weird 15 in 1 Cartridge
Replies: 13
Views: 994

Re: Weird 15 in 1 Cartridge

Great!! Thanks Krzysiobal! 4.You lifted that part of track which might cause you cartridge to not work anymore: Yeah, I goofed up in these parts that should be the easier ones. :-( In my "defense", I can say it's been really hot here, and I was having difficulty keeping steady. In fact, it...
by Fisher
Thu Feb 22, 2024 5:04 pm
Forum: NES Hardware and Flash Equipment
Topic: Weird 15 in 1 Cartridge
Replies: 13
Views: 994

Re: Weird 15 in 1 Cartridge

That's pretty interesting.
I've never seen anything like this before.
Not that I have that much knowledge... lol
by Fisher
Thu Feb 22, 2024 4:02 pm
Forum: NES Hardware and Flash Equipment
Topic: Weird 15 in 1 Cartridge
Replies: 13
Views: 994

Re: Weird 15 in 1 Cartridge

I tried to draw the schematics: Schematics.png Not sure if it's correct. Not sure why it has these pull-down resistors on the upper address lines and plugging the ROMs together on the data bus used by the mapper register. No idea why it was not working at first. Can someone please try to explain to ...
by Fisher
Thu Feb 22, 2024 3:58 pm
Forum: NES Hardware and Flash Equipment
Topic: Weird 15 in 1 Cartridge
Replies: 13
Views: 994

Weird 15 in 1 Cartridge

I did get a weird 15 in 1 cartridge that's not working. I tried to search for a similar one to get clues but didn't found anything. Front.png Looks like these are the games on it: Back.png Assembled PCB: PCB Comp.png Front of the PCB: PCB CompD.png Back of the PCB: PCB Sold.png Looks like I goofed u...
by Fisher
Sun Jan 28, 2024 6:33 pm
Forum: NES Hardware and Flash Equipment
Topic: SNES S-WRAM substitution
Replies: 5
Views: 537

Re: SNES S-WRAM substitution

RAM A16 comes from CPU A22 AND A16, so that system area mirrors in banks $01, $03, $05, ..., $3F and $81, $83, $85, ..., $BF read address bank $7E, not $7F So, an and gate should do the trick. The data port at B bus $80 and its 17-bit address counter at B bus $81-83 What about the counter of the B ...
by Fisher
Sun Jan 28, 2024 8:54 am
Forum: NES Hardware and Flash Equipment
Topic: SNES S-WRAM substitution
Replies: 5
Views: 537

Re: SNES S-WRAM substitution

It's not particularly complicated logic - a discrete logic adapter could be designed, but it's going to be a fair amount of space. That sounds good, at least doable. What kind of logic I should try to implement? Maybe decode the CAS and RAS signals? I have no idea how it should be done. Has anyone ...
by Fisher
Sat Jan 27, 2024 1:44 pm
Forum: NES Hardware and Flash Equipment
Topic: SNES S-WRAM substitution
Replies: 5
Views: 537

SNES S-WRAM substitution

Hello. I don't know if it was asked before, probably was... I and some friends have some SNES consoles that all have the same defect: a bad S-WRAM. The only source of these ICs seems to be other SNES. Does someone know about other ICs that can be used as a substitute? I've seen some clones that use ...
by Fisher
Sat Jan 27, 2024 1:35 pm
Forum: NES Hardware and Flash Equipment
Topic: Help to program 16 bit EPROMs on a 8 bit programmer
Replies: 12
Views: 4178

Re: Help to program 16 bit EPROMs on a 8 bit programmer

Finally, I was able to draw the schematics. Not that it is very complex, but It was difficult to find a library that had the 16-bit EPROMs. So here you are: 8 to 16 bit.png The source code of the bin2hilo program: bin2hilo.c I don't know who wrote it, but I would like to. So I can give proper credit...
by Fisher
Fri Dec 08, 2023 12:27 pm
Forum: NES Hardware and Flash Equipment
Topic: Help to program 16 bit EPROMs on a 8 bit programmer
Replies: 12
Views: 4178

Re: Help to program 16 bit EPROMs on a 8 bit programmer

That's exactly what I'm doing. Seems to be working great! It's not easy to spot on the pictures, since I'm using 10k resistor networks. I really need to properly draw this schematics! Unfortunately, I couldn't find any symbol library for the 16-bit EPROMs. Does someone know of any or I'll need to tr...
by Fisher
Fri Dec 08, 2023 5:36 am
Forum: NES Hardware and Flash Equipment
Topic: Help to program 16 bit EPROMs on a 8 bit programmer
Replies: 12
Views: 4178

Re: Help to program 16 bit EPROMs on a 8 bit programmer

Thanks. I can now program the 27c160, I added a jumper to select the first or last bank. The process is a little more complex than that, as it is necessary to separate the even bytes from the odd ones and record them separately. I think I will need to add at least 2 more jumpers to program the 27c32...
by Fisher
Fri Nov 03, 2023 6:26 am
Forum: NES Hardware and Flash Equipment
Topic: Help to program 16 bit EPROMs on a 8 bit programmer
Replies: 12
Views: 4178

Re: Help to program 16 bit EPROMs on a 8 bit programmer

Finally, I was able to program a 27C800 with the adapter I built. Hopefully, it won't be that hard to program a 27C160, not sure about the 27C322. The top part: WhatsApp Image 2023-11-03 at 07.45.18.jpeg The bottom part: WhatsApp Image 2023-11-03 at 07.45.19.jpeg Diagonal view: WhatsApp Image 2023-1...
by Fisher
Sat Oct 14, 2023 8:07 pm
Forum: NES Hardware and Flash Equipment
Topic: Graphic glitches and no sound after AV Famicom Mod
Replies: 15
Views: 3079

Re: Graphic glitches and no sound after AV Famicom Mod

Have you ever looked for short circuits?
In the photos there seem to be a lot of them.
Good luck!