Search found 567 matches

by Jarhmander
Mon Mar 13, 2023 7:25 pm
Forum: NESdev
Topic: DPCM + $2007 reads
Replies: 22
Views: 1791

Re: DPCM + $2007 reads

Honestly, I think the simplest workaround is to disable the DMC channel before the $2007 reads. Since you're aiming to use this in a pause menu, you can get away with playing a song which does not use DPCM. Otherwise, muting DMC can just be masked as some audio effect a la SMBUSA, where the pause t...
by Jarhmander
Sun Mar 05, 2023 10:44 am
Forum: NESdev
Topic: Garbage Collector for CC65
Replies: 31
Views: 2253

Re: Garbage Collector for CC65

It can make sense if one makes a game with a somewhat lightweight scripting engine. Ideally, the garbage collector should run frequently with small collection steps so it is quick to run in the general case that the scripting engine doesn't generate more garbage than the collector can collect. The s...
by Jarhmander
Wed Mar 01, 2023 5:42 am
Forum: NESemdev
Topic: PAL color palette emulation
Replies: 90
Views: 75877

Re: PAL color palette emulation

I remember the description of the output DAC as a resistor chain, but I never saw before a drawing with the color emphasis.

And BTW, welcome back! Long time no see!
by Jarhmander
Mon Jan 30, 2023 8:17 pm
Forum: General Stuff
Topic: Living without a personal smartphone
Replies: 69
Views: 30741

Re: Living without a personal smartphone

Sports.
by Jarhmander
Mon Jan 30, 2023 5:04 pm
Forum: NESdev
Topic: Can't get my old famicom work
Replies: 16
Views: 1388

Re: Can't get my old famicom work

You might be able to check with a multimeter without opening it, if you have one. I'm guessing the outside of one of those video/audio outputs are connected to ground. Maybe you can determine the power input ground by seeing which side has continuity with the audio/video plugs. Post a couple pics o...
by Jarhmander
Sat Jan 28, 2023 7:48 pm
Forum: NESemdev
Topic: Mesen - Emulator
Replies: 415
Views: 251046

Re: Mesen - Emulator

I'm currently packaging it for Arch Linux (edit: done! ), so installing there will be simpler; I just opened a PR that fixes some build errors I encountered along the way. Thank you for the lighter dependencies, by the way! Nice, thank you! Will vote for your package once I install it and play arou...
by Jarhmander
Sat Jan 28, 2023 8:35 am
Forum: NESdev
Topic: Can't get my old famicom work
Replies: 16
Views: 1388

Re: Can't get my old famicom work

That AC brick is definitely not enough, 500mA+ @ 7V+ is needed to make things reliably run. Polarity is center negative like MD1, SMS and many other Japanese made things. Reverse polarity is likely to cause damage to the 7805 in there. How do you know the polarity? This is a famiclone, it can be an...
by Jarhmander
Sat Jan 28, 2023 8:33 am
Forum: NESemdev
Topic: Mesen - Emulator
Replies: 415
Views: 251046

Re: Mesen - Emulator

This emu is on GitHub. If you can, submit your issues (or suggestions) here, it will be easier for Sour to manage, instead of looking at a thread that will go large in a matter of time.

(Can't help but feel sorry for a developer!)
by Jarhmander
Fri Jan 27, 2023 11:19 am
Forum: NESdev
Topic: Can't get my old famicom work
Replies: 16
Views: 1388

Re: Can't get my old famicom work

The adapter can only deliver 250mA, I highly doubt it is enough (except if the famiclone uses modern components and uses less energy). Find something that delivers 750mA or more. Also, I can't see the polarity of the DC current for the famiclone, but you have to know this before plugging the power i...
by Jarhmander
Fri Jan 20, 2023 9:41 am
Forum: General Stuff
Topic: Desired Possible Inventions
Replies: 13
Views: 1483

Re: Desired Possible Inventions

Probably pressure; after all there's quite a bit of pressure in a unopened can or bottle, and it only goes flat after opening.

Besides, my solution to this problem is to only buy cans. Not that I drink much soft drinks for that matter.
by Jarhmander
Sat Jan 14, 2023 9:18 pm
Forum: NES Music
Topic: Saw Wave on DPCM channel w/ Famitracker
Replies: 14
Views: 2545

Re: Saw Wave on DPCM channel w/ Famitracker

I understood that bit, but I was making sure you didn't attempt to make an NSF out of it.
by Jarhmander
Fri Jan 13, 2023 3:39 pm
Forum: NES Music
Topic: Saw Wave on DPCM channel w/ Famitracker
Replies: 14
Views: 2545

Re: Saw Wave on DPCM channel w/ Famitracker

Just in case, what are you trying to achieve? Whatever you want to do has to be in a NES program (*.nes file); you can't do this in an NSF file, because you can't use (*) IRQs in NSF files, and the DMC sawtooth waves heavily relies on them. *: being pedantic, but in an NSF file you can rely on IRQ f...
by Jarhmander
Wed Jan 11, 2023 11:15 am
Forum: SNESdev
Topic: What is wrong with my SNES?
Replies: 3
Views: 989

Re: What is wrong with my SNES?

Maybe, maybe the pull-up resistor on the data line of the 2nd controler is burnt/broken, and the controler data is indeterminate? I don't see why that would happen, but it could certainly read illegal controler values (left+right up+down etc) but only if the 2nd controler is absent. Many games freak...
by Jarhmander
Wed Jan 11, 2023 6:29 am
Forum: NES Hardware and Flash Equipment
Topic: Modern Mapper Replacement Chips?
Replies: 27
Views: 2362

Re: Modern Mapper Replacement Chips?

An naive implementation of multiplication by difference of squares would use 512 bytes for a LUT (256 16-bit values), and would require an 8-bit difference+lsr, an 8-bit mean, 2 16-bits lookup and a 16-bit difference. In the ballpark of 50 cycles or so?