Search found 10121 matches

by lidnariq
Wed Jan 27, 2021 10:54 pm
Forum: Newbie Help Center
Topic: Batman cart blinks
Replies: 1
Views: 33

Re: Batman cart blinks

Either the cart's CIC is damaged, or the pins that connect the CIC to the console are damaged.

The simplest solution is to disable your NES's CIC, which can be either the "cut pin 4" technique, or the "add two wires" technique.
by lidnariq
Wed Jan 27, 2021 10:48 pm
Forum: NES Hardware and Flash Equipment
Topic: SKROM Schematic?
Replies: 17
Views: 5901

Re: SKROM Schematic?

But it's only in a place to protect the battery, and those coin cells have significant internal resistances anyway (at least 7 ohms when new)... Oh, apparently it's a UL requirement: https://www.embedded.com/ul-coin-cell-requirements/ The 1k resistor guarantees that even if the diode fails to a shor...
by lidnariq
Wed Jan 27, 2021 9:19 pm
Forum: NES Hardware and Flash Equipment
Topic: SKROM Schematic?
Replies: 17
Views: 5901

Re: SKROM Schematic?

The 1K has different function than the other two – it's there as some kind of current limiter to cause the RAM to brownout in case it's accessed during power failure ... although I'm not clear how that could help. Maybe it'd make a marginal voltage on /RAMCE read as logic high (i.e. false). But that...
by lidnariq
Wed Jan 27, 2021 6:05 pm
Forum: SNESdev
Topic: What is your process for creating graphics for the SNES?
Replies: 11
Views: 303

Re: What is your process for creating graphics for the SNES?

Maybe better to refer to those as "50Hz video" and "60Hz video"? or 625-line and 525-line? Because the color encoding isn't actually relevant, disambiguates the weirdness of Brazil's PAL-M, and also doesn't need to explain SECAM.
by lidnariq
Wed Jan 27, 2021 1:42 pm
Forum: NES Music
Topic: N163 Multi-Wave Sampling in FamiTracker
Replies: 22
Views: 608

Re: N163 Multi-Wave Sampling in FamiTracker

I ... don't know. Right now you've got a loop that's 347÷14400Hz = 24.1ms long, which isn't a multiple of 1/60Hz, and I don't know how to resolve that. Resampling it isn't sufficient, because resampling things won't change the duration of the loop. You might be able to switch between two instruments...
by lidnariq
Wed Jan 27, 2021 12:32 pm
Forum: SNESdev
Topic: SNES won't turn on 2
Replies: 5
Views: 193

Re: SNES won't turn on 2

I think my take-away from helping diagnose poot36's SNES is that unless you have a pool of multiple SNESes with failures, and a hot-air rework station, it's just too hard to fix most failures, so it's not worth it to do more than cursory testing (i.e. vreg, fuse, CIC)
by lidnariq
Tue Jan 26, 2021 10:15 pm
Forum: NES Music
Topic: N163 Multi-Wave Sampling in FamiTracker
Replies: 22
Views: 608

Re: N163 Multi-Wave Sampling in FamiTracker

When using this method, I think you cannot have a loop length that is longer than 240 samples, unless it's an integer multiple of 240 (or whatever block size you're using). ... and unfortunately, FamiTracker doesn't support multiple different wavetable lengths within the same instrument, so I think ...
by lidnariq
Mon Jan 25, 2021 12:25 am
Forum: Other Retro Dev
Topic: Deflemask player for PCE
Replies: 4
Views: 169

Re: Deflemask player for PCE

Not really related, but I'm surprised at how much better I like that arrangement over the original.
by lidnariq
Sun Jan 24, 2021 10:39 pm
Forum: NES Hardware and Flash Equipment
Topic: Replacing mn1026, Ba6162, etc with discrete logic
Replies: 13
Views: 1090

Re: Replacing mn1026, Ba6162, etc with discrete logic

poorstudenthobbyist wrote:
Sun Jan 24, 2021 9:39 pm
I'm wondering why the SNES doesn't have a battery monitor IC on it as well.
The MAD-1 is believed to include one. That doesn't handle the boards that use a 74'139, however.
by lidnariq
Sun Jan 24, 2021 5:58 pm
Forum: Homebrew Projects
Topic: Port NES/Famicom game to Nintendo VS. hardware possible? (Punch-Out)
Replies: 23
Views: 726

Re: Port NES/Famicom game to Nintendo VS. hardware possible? (Punch-Out)

But since the game is indeed available on pc10, then the interest for this might be very low :| Between there just not being that many Vs. System machines, and needing a brand new daughterboard, I don't think you're going to get much interest anyway. So I'd say this should come down to whether this...
by lidnariq
Sat Jan 23, 2021 11:21 pm
Forum: Homebrew Projects
Topic: Port NES/Famicom game to Nintendo VS. hardware possible? (Punch-Out)
Replies: 23
Views: 726

Re: Port NES/Famicom game to Nintendo VS. hardware possible? (Punch-Out)

Since tepples reminded me, it might actually be easier to NESRGB an NES and put that in a random arcade cabinet than to port the Punch-Out cartridge to a Vs. System daughterboard. But if you think the idea of making the first new class of daughterboard for the Vs. System sounds fun, don't let me sto...
by lidnariq
Sat Jan 23, 2021 10:49 pm
Forum: NESdev
Topic: Was there an NES expansion chip like SA-1
Replies: 31
Views: 1164

Re: Was there an NES expansion chip like SA-1

Could you make a more advanced PPU expansion chip then? Please read these following two quotes closely : There is a mapper in the works called MXM that provides 8x1-pixel attribute areas for backgrounds. It runs on INL's Gowin FPGA-based boards and looks to provide about as much of an improvement o...
by lidnariq
Sat Jan 23, 2021 4:04 pm
Forum: Homebrew Projects
Topic: Port NES/Famicom game to Nintendo VS. hardware possible? (Punch-Out)
Replies: 23
Views: 726

Re: Port NES/Famicom game to Nintendo VS. hardware possible? (Punch-Out)

You're right, I forgot about the NESRGB.

But from what I've seen, no ones uses Vs. arcade boards in coin-op mode any more; they all seem to just be left in free play. In other words, the point seems to be the cabinet, not the mainboard.