To me that looks like either the OAM ram inside the ppu is broken. Or your famicom RAM chip is broken, and the broken data is copied to the OAM.
Hopefully it is the latter, because RAM chips can be bought easily, PPU chips not so much.
Search found 1047 matches
- Sun May 16, 2021 5:09 pm
- Forum: Newbie Help Center
- Topic: Famicom part of sprites are below where they should be
- Replies: 5
- Views: 4001
- Fri Nov 20, 2020 2:26 pm
- Forum: NES Hardware and Flash Equipment
- Topic: How to design the PCB of PIC18f2520 microcontroller
- Replies: 9
- Views: 5082
Re: How to design the PCB of PIC18f2520 microcontroller
That's like people who say you don't need bypass caps because "it worked for me". I say that on purpose to show clearly that I don't have anything to back up my statements, even encouraging to look up the datasheet. It's just my experience, making sure you know that and not hiding anythin...
- Fri Nov 20, 2020 2:07 pm
- Forum: NES Hardware and Flash Equipment
- Topic: How to design the PCB of PIC18f2520 microcontroller
- Replies: 9
- Views: 5082
Re: How to design the PCB of PIC18f2520 microcontroller
That's like people who say you don't need bypass caps because "it worked for me". I say that on purpose to show clearly that I don't have anything to back up my statements, even encouraging to look up the datasheet. It's just my experience, making sure you know that and not hiding anythin...
- Fri Nov 20, 2020 11:42 am
- Forum: NES Hardware and Flash Equipment
- Topic: How to design the PCB of PIC18f2520 microcontroller
- Replies: 9
- Views: 5082
Re: How to design the PCB of PIC18f2520 microcontroller
Sorry but I have to disagree with that completely aquasnake. First of all, I advise against the diodes because then the voltage getting to the PIC micro will be less by a diode drop. You could check the datasheet to be sure but 99.9992% chance the regulator doesn't care if its output gets powered w...
- Thu Nov 05, 2020 7:39 am
- Forum: NES Hardware and Flash Equipment
- Topic: Hori Game Repeater
- Replies: 8
- Views: 7115
Re: Hori Game Repeater
Interesting analysis! It does seem quite cheaply made. (and hard to use) As for the PCB being paper, I do think it helps to have some perspective on things. At the end of the day this would've been considered a toy, so there were probably (paper ;) ) thin margins. I suspect the reason they didn't co...
- Sun Oct 04, 2020 6:17 am
- Forum: NES Hardware and Flash Equipment
- Topic: Reverse Engineering the CIC
- Replies: 618
- Views: 342353
Re: Reverse Engineering the CIC
I guess that settles it, the 3198A (probably) cannot be dumped this way. I suppose a decap will be neccessary.
- Thu Oct 01, 2020 3:42 pm
- Forum: NES Hardware and Flash Equipment
- Topic: Reverse Engineering the CIC
- Replies: 618
- Views: 342353
Re: Reverse Engineering the CIC
One could try pulling R22 low, perhaps that controls the page.
edit: alternatively, one could try setting R20 or R21 high. with two pins you can adress 4 pages.
edit: alternatively, one could try setting R20 or R21 high. with two pins you can adress 4 pages.
- Thu Oct 01, 2020 3:14 pm
- Forum: NES Hardware and Flash Equipment
- Topic: Reverse Engineering the CIC
- Replies: 618
- Views: 342353
Re: Reverse Engineering the CIC
Here's a quick test for 1016 bytes: //sm590 dumper script //Written by Jero32 24/09/2020 //to run, hook the arduino pins up to sm590 chip according to pinout below. Upload sketch to arduino. Clear the terminal window //and press the reset button //do one clock cycle. Note: relies on opcodes taking t...
- Thu Oct 01, 2020 2:51 pm
- Forum: NES Hardware and Flash Equipment
- Topic: Reverse Engineering the CIC
- Replies: 618
- Views: 342353
Re: Reverse Engineering the CIC
Hey it worked! Neat. I guess now someone has to analyze the code to see if it's all there. edit: I hope this is a more "proper" fix, I added a serial.flush command after sending some data, maybe the buffer was overloading or something. If you wouldn't mind trying it out. //sm590 dumper scr...
- Thu Oct 01, 2020 2:37 pm
- Forum: NES Hardware and Flash Equipment
- Topic: Reverse Engineering the CIC
- Replies: 618
- Views: 342353
Re: Reverse Engineering the CIC
it stops after printing i1F5 with the newer code, the old code https://pastebin.com/raw/aQFhF3DC I get the following *log here* The print loop is independent of the actual data read, so maybe it's not sending out the buffer, gimme a sec and I'll look up documentation on that. Try this: //sm590 dump...
- Thu Oct 01, 2020 2:01 pm
- Forum: NES Hardware and Flash Equipment
- Topic: Reverse Engineering the CIC
- Replies: 618
- Views: 342353
Re: Reverse Engineering the CIC
Sadly I think your famicombox cic('s) is (/are) just dead
- Thu Oct 01, 2020 1:38 pm
- Forum: NES Hardware and Flash Equipment
- Topic: Reverse Engineering the CIC
- Replies: 618
- Views: 342353
Re: Reverse Engineering the CIC
Using the last arduino code posted I got the following on the 3199A chip. i0 :75 i1 :30 i2 :4A i3 :74 i4 :42 i5 :C0 i6 :7D i7 :A6 i8 :7E i9 :7D iA :7D iB :D3 iC :7D iD :CA iE :7E iF :5B i10 :75 i11 :22 i12 :63 i13 :9D i14 :0 i15 :28 i16 :52 i17 :EB i18 :EC i19 :74 i1A :22 i1B :60 i1C :B0 i1D :D7 i1...
- Thu Oct 01, 2020 10:07 am
- Forum: Reproduction
- Topic: Using non CMOS eproms on NES Carts
- Replies: 11
- Views: 7634
Re: Using non CMOS eproms on NES Carts
Reading the datasheet, it seems the /G enable signal going low is what latches the data out on that particular chip. Make sure your address decoding is connected to that particular pin. https://futurlec.com/Memory/27128_Datasheet.shtml edit I checked some pictures of nrom pcbs online: https://www.ni...
- Sun Sep 27, 2020 5:06 pm
- Forum: NES Hardware and Flash Equipment
- Topic: Reverse Engineering the CIC
- Replies: 618
- Views: 342353
Re: Reverse Engineering the CIC
If you'd like a 6113B1, I believe they're the standard in NES Play Action Football, which is a very cheap game; I was getting mine for $2 at the local game shop. Sadly I live in Pal territory, so getting even cheap ntsc games is a hassle. edit, btw fiskbit, did you try my updated code where I bring...
- Sun Sep 27, 2020 4:32 pm
- Forum: NES Hardware and Flash Equipment
- Topic: Reverse Engineering the CIC
- Replies: 618
- Views: 342353
Re: Reverse Engineering the CIC
Do we know why the 6113B won’t dump either? Mine is a working chip. I can try another game, I did get a proper desoldering setup to prevent messing up anything on the main board repairs. I do not know at this point, but without using an oscilloscope and actually seeing what's going on, it becomes a...