Search found 507 matches

by Ben Boldt
Sun Apr 05, 2020 6:11 pm
Forum: NES Hardware and Flash Equipment
Topic: Forever DUO 852 Games of NES (405+447)
Replies: 12
Views: 342

Re: Forever DUO 852 Games of NES (405+447)

100 cycles is the maximum number for which the chip is still guaranteed to retain data for the full rated number of years and across the full temperature and voltage range. Some years ago, someone sold a bunch of kits to intentionally wear out a small serial EEPROM . Subsequent reports showed that ...
by Ben Boldt
Sun Mar 29, 2020 9:59 am
Forum: NES Hardware and Flash Equipment
Topic: How can I dump 143in1 cartridge's savefiles with kazzo ?
Replies: 9
Views: 399

Re: How can I dump 143in1 cartridge's savefiles with kazzo ?

Probably worth taking the time to play through those games again on an emulator or better cart. If you have lost lots of progress, you could google up cheat codes or Game Genie codes to get back to where you were more quickly. Also, you can find SRAM and freeze state files online too. That will prob...
by Ben Boldt
Tue Mar 24, 2020 7:56 pm
Forum: NES Hardware and Flash Equipment
Topic: How can I dump 143in1 cartridge's savefiles with kazzo ?
Replies: 9
Views: 399

Re: How can I dump 143in1 cartridge's savefiles with kazzo ?

Honestly you should throw that cartridge in the garbage can. It may damage a real Famicom due to incorrect logic levels. I have 2 different 143-in-1 carts, neither identical to yours. Both of mine only have 8k save RAM total, so any time you play a different game, it overwrites the save of the previ...
by Ben Boldt
Sun Mar 22, 2020 9:36 pm
Forum: NES Hardware and Flash Equipment
Topic: EverDrive N8 alleged mapper inaccuracies
Replies: 22
Views: 1446

Re: EverDrive N8 alleged mapper inaccuracies

And what a lot of older emulators didn't emulate is that if I remember correctly, the N163's volume control fades toward 8, not 0. Given that there are 15 volume levels and 15 M2 cycles per full cycle of the N163 WSG, my pet theory is that it uses the volume register to control a pulse width modula...
by Ben Boldt
Sun Mar 22, 2020 9:49 am
Forum: NES Hardware and Flash Equipment
Topic: EverDrive N8 alleged mapper inaccuracies
Replies: 22
Views: 1446

Re: EverDrive N8 alleged mapper inaccuracies

I haven't had a habit of testing emulators for audio accuracy, so I don't really know who gets N163 right I didn't test many myself either, just a few. Confirming that Mesen is better than FCEUx at keeping the waveform centered. I have not tested samples longer than 32 on Mesen. FCEUX: n163_FCEUX.p...
by Ben Boldt
Sat Mar 21, 2020 8:26 pm
Forum: NES Hardware and Flash Equipment
Topic: EverDrive N8 alleged mapper inaccuracies
Replies: 22
Views: 1446

Re: EverDrive N8 alleged mapper inaccuracies

I have never seen ANYTHING other than a real Namco-163 chip that supports this. I think this is partially because our Wiki needs refinement. No, the source of that misunderstanding is Goroh's document from 1997, which many older emulators based their implementation on. The wiki has been quite clear...
by Ben Boldt
Sat Mar 21, 2020 12:03 pm
Forum: NES Hardware and Flash Equipment
Topic: EverDrive N8 alleged mapper inaccuracies
Replies: 22
Views: 1446

Re: EverDrive N8 alleged mapper inaccuracies

N163: Wave sizes past 32 aren't supported. I have never seen ANYTHING other than a real Namco-163 chip that supports this. I think this is partially because our Wiki needs refinement. Also, I have noticed that, just looking visually at the sound wave produced in 4-channel mode, the real Namco-163 i...
by Ben Boldt
Sun Mar 08, 2020 7:53 pm
Forum: General Stuff
Topic: Could someone help me with NesCartDB?
Replies: 4
Views: 4842

Re: Could someone help me with NesCartDB?

I don't have it, sorry. I just sent an email to the hotmail address on the software page with the images attached and they created the Hello Kitty World profile for me... Maybe they could help? It seems you have to log in to get to that email link. Send me a PM if you want the email address directly.
by Ben Boldt
Fri Mar 06, 2020 7:45 pm
Forum: Homebrew Projects
Topic: Famicom Network Controller (HVC-051) test ROM commission?
Replies: 8
Views: 2551

Re: Famicom Network Controller (HVC-051) test ROM commission?

Just noticed this thread -- attaching photos of my PCB.
by Ben Boldt
Fri Mar 06, 2020 4:26 pm
Forum: NES Hardware and Flash Equipment
Topic: Building a 0 chip cartridge
Replies: 7
Views: 2388

Re: Building a 0 chip cartridge

I just have to chime in and say that you guys are completely crazy. :beer: :beer:
by Ben Boldt
Sun Mar 01, 2020 12:05 pm
Forum: NES Hardware and Flash Equipment
Topic: MY VERY OLD CARTRIDGE: Can I still fix this and able to play?
Replies: 4
Views: 1318

Re: MY VERY OLD CARTRIDGE: Can I still fix this and able to play?

It looks like the chips should be facing toward you when you insert it. Putting it in the wrong way might cause damage. Try what krzysiobal said to clean it. If that still does not work, you can use an old toothbrush with some liquid soap and scrub the entire board, adding small amount of water peri...
by Ben Boldt
Thu Feb 27, 2020 5:03 pm
Forum: NES Hardware and Flash Equipment
Topic: RAMBO-1 Mapper Investigation
Replies: 103
Views: 26771

Re: RAMBO-1 Mapper Investigation

A couple updates. Transitioning to reset inactive state does not care about PA12. I came up with no simulation where checking PA12 for this made any difference. However, this transition does have to be on falling edge M2. It could be possible to rearrange things or change dependencies in such a way ...
by Ben Boldt
Wed Feb 26, 2020 6:16 pm
Forum: NES Hardware and Flash Equipment
Topic: RAMBO-1 Mapper Investigation
Replies: 103
Views: 26771

Re: RAMBO-1 Mapper Investigation

You know it's getting good when I fire up Visio, I no longer know of a test condition that fails: scanline_states.png 4-Bit counter (M2 falling edge): (Basically: In sprite state, counts to 15 clocks before switching to background state on the 16th clock.) INC if "Sprite" && (4-bit != 15) && (PA12 =...
by Ben Boldt
Tue Feb 25, 2020 4:45 pm
Forum: NES Hardware and Flash Equipment
Topic: RAMBO-1 Mapper Investigation
Replies: 103
Views: 26771

Re: RAMBO-1 Mapper Investigation

Diagram updates. I was able to correct a corner case I found in the sprite-to-background transition. The chip must be checking PA12=0 to make this transition. Normally, the 4-bit counter requires PA12 = 0 in order to increment. So, PA12 must remain 0 for 15 cycles to make the 4-bit counter = 15. The...
by Ben Boldt
Mon Feb 24, 2020 1:52 pm
Forum: NES Hardware and Flash Equipment
Topic: RAMBO-1 Mapper Investigation
Replies: 103
Views: 26771

Re: RAMBO-1 Mapper Investigation

I found today that the power-on-reset value of C000 appears to always be FF, I have found no exception to this. If I just totally skip writing to C000 (i.e. replace it with a dummy read in my test), I will get an IRQ at the 256th scanline detected, and looping naturally, I get another IRQ at 512th s...