Search found 1046 matches

by Jeroen
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: 362

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 anything. I never...
by Jeroen
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: 362

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 anything. I never...
by Jeroen
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: 362

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...
by Jeroen
Thu Nov 05, 2020 7:39 am
Forum: NES Hardware and Flash Equipment
Topic: Hori Game Repeater
Replies: 8
Views: 1423

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...
by Jeroen
Sun Oct 04, 2020 6:17 am
Forum: NES Hardware and Flash Equipment
Topic: Reverse Engineering the CIC
Replies: 589
Views: 250302

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.
by Jeroen
Thu Oct 01, 2020 3:42 pm
Forum: NES Hardware and Flash Equipment
Topic: Reverse Engineering the CIC
Replies: 589
Views: 250302

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.
by Jeroen
Thu Oct 01, 2020 3:14 pm
Forum: NES Hardware and Flash Equipment
Topic: Reverse Engineering the CIC
Replies: 589
Views: 250302

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...
by Jeroen
Thu Oct 01, 2020 2:51 pm
Forum: NES Hardware and Flash Equipment
Topic: Reverse Engineering the CIC
Replies: 589
Views: 250302

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 script //Writ...
by Jeroen
Thu Oct 01, 2020 2:37 pm
Forum: NES Hardware and Flash Equipment
Topic: Reverse Engineering the CIC
Replies: 589
Views: 250302

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...
by Jeroen
Thu Oct 01, 2020 2:01 pm
Forum: NES Hardware and Flash Equipment
Topic: Reverse Engineering the CIC
Replies: 589
Views: 250302

Re: Reverse Engineering the CIC

Sadly I think your famicombox cic('s) is (/are) just dead :(
by Jeroen
Thu Oct 01, 2020 1:38 pm
Forum: NES Hardware and Flash Equipment
Topic: Reverse Engineering the CIC
Replies: 589
Views: 250302

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...
by Jeroen
Thu Oct 01, 2020 10:07 am
Forum: Reproduction
Topic: Using non CMOS eproms on NES Carts
Replies: 11
Views: 2349

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...
by Jeroen
Sun Sep 27, 2020 5:06 pm
Forum: NES Hardware and Flash Equipment
Topic: Reverse Engineering the CIC
Replies: 589
Views: 250302

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...
by Jeroen
Sun Sep 27, 2020 4:32 pm
Forum: NES Hardware and Flash Equipment
Topic: Reverse Engineering the CIC
Replies: 589
Views: 250302

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...
by Jeroen
Sun Sep 27, 2020 4:00 pm
Forum: NES Hardware and Flash Equipment
Topic: Reverse Engineering the CIC
Replies: 589
Views: 250302

Re: Reverse Engineering the CIC

If anyone's interested in giving dumping a try. This seller seems to be selling quite a few famicombox games https://www.ebay.com/sch/shinjuku_card_ ... pg=&_from=

note: if someone can send me a known working one, I can probably dump it.