Search found 517 matches

by Jarhmander
Sat Feb 27, 2021 7:28 am
Forum: NESdev
Topic: How can i hack Graphics of a game without CHR Rom?
Replies: 5
Views: 1510

Re: How can i hack Graphics of a game without CHR Rom?

That's... not how it works. You can't realistically add CHR-ROM to your game from its CHR-RAM, as the game can use the CHR-RAM as it want; it can even use it as scratch space if it wanted to. Moreover, it can "morph" the pattern data in runtime, as the CHR data is in a RAM after all and can be modif...
by Jarhmander
Sat Feb 27, 2021 7:14 am
Forum: NES Music
Topic: Ppmck help on vrc6 noise?
Replies: 10
Views: 5645

Re: Ppmck help on vrc6 noise?

I had a pretty busy week. Thank you for your patience. In the attached zip file there are binaries for Linux and Windows. For Linux, the helper script mknsf can be used, but on Windows it is not directly usable and you'll need a POSIX shell which can be found in Cygwin, MSYS2, in "bash" supplied wit...
by Jarhmander
Fri Feb 26, 2021 7:57 am
Forum: NESdev
Topic: How can i hack Graphics of a game without CHR Rom?
Replies: 5
Views: 1510

Re: How can i hack Graphics of a game without CHR Rom?

That's when it becomes complicated. If the iNES file has no CHR-ROM, then it has CHR-RAM, and the game can write to it whenever it want to, and the data in PRG-ROM is very likely to be compressed into a in-house format, specifically made for this game. You'll have to reverse-engineer the game yourse...
by Jarhmander
Mon Feb 22, 2021 5:20 am
Forum: NES Music
Topic: Ppmck help on vrc6 noise?
Replies: 10
Views: 5645

Re: Ppmck help on vrc6 noise?

Thanks @Jarhmander, it works. Does anyone knows where a lator version of ppmck is other than the one I posted? Difficult to say, but I guess here's the latest version: https://github.com/munshkr/ppmck. It seems there's only a Linux release and you should compile from source if you want a Windows bi...
by Jarhmander
Sat Feb 20, 2021 6:18 am
Forum: NES Music
Topic: Ppmck help on vrc6 noise?
Replies: 10
Views: 5645

Re: Ppmck help on vrc6 noise?

Yes. I nead to know how to do looped noise. I also have this version of ppmck I found, can someone tell me where I could get newer versions of ppmck from? And if it's possyble to do looped noise on this version at all. The simple way to make looped noise is to use D16 on the D channel. It's also po...
by Jarhmander
Sun Jan 24, 2021 7:14 am
Forum: NESdev
Topic: Question about DMC channel sample size
Replies: 6
Views: 4716

Re: Question about DMC channel sample size

Hey guys! I am working on improving DPCM support in FamiStudio and I was re-reading the DMC channel doc and I have a question. What do guys think was the reasoning behind samples start addresses being 64-bytes aligned, while having their size being 16x + 1 ? That "+1" is really wrecking my brain. W...
by Jarhmander
Wed Dec 16, 2020 5:57 am
Forum: General Stuff
Topic: What is with indie games and procedural generation?
Replies: 16
Views: 8391

Re: What is with indie games and procedural generation?

Aren't Diablo's levels procedurally generated? They were very well made.
by Jarhmander
Sat Dec 12, 2020 7:35 am
Forum: NESdev
Topic: Vs System Shared Memory
Replies: 48
Views: 13082

Re: Vs System Shared Memory

The self-assignment itself looks incredibly stupid. Never, ever did I have to resort to a workaround that stupid (yes, I *did* have to use stupid workarounds at times, because for example the XC8 compiler did *really* stupid things). Yes, depending on the compiler/platform, I saw the generated code ...
by Jarhmander
Thu Dec 10, 2020 4:40 am
Forum: NESdev
Topic: Vs System Shared Memory
Replies: 48
Views: 13082

Re: Vs System Shared Memory

I developed professionally various embedded systems with different microcontrollers from various vendors (STMicroelectronics, Microchip, NXP, TI, ...), and I can guarantee that for all peripheral register definitions, they all use the volatile keyword for qualifying the storage, either with an exter...
by Jarhmander
Tue Dec 08, 2020 5:42 am
Forum: NESdev
Topic: Vs System Shared Memory
Replies: 48
Views: 13082

Re: Vs System Shared Memory

How is the port pin $4016.2 wired between the CPUs? Is the one from the primary CPU directly wired to the IRQ line of the second CPU, and the $4016.2 port pin of the second CPU somehow connected to the primary CPU's IRQ line?
by Jarhmander
Mon Nov 30, 2020 5:22 am
Forum: Newbie Help Center
Topic: Question about NMI / displaying new background
Replies: 29
Views: 12416

Re: Question about NMI / displaying new background

Can the lack of back up CPU status in the NMI (PHP, PLP) cause errors when using the NMI interrupt along with the code in the CPU loop? I have not used it before and I do not see any mention of it here: https://wiki.nesdev.com/w/index.php/The_frame_and_NMIs NMI: PHP ;add? pha ;protect the registers...
by Jarhmander
Thu Oct 01, 2020 6:32 pm
Forum: NES Hardware and Flash Equipment
Topic: Eccentric pedantic "monochrome" glitch
Replies: 21
Views: 10749

Re: Eccentric pedantic "monochrome" glitch

Huh? How it can be 17/24? I count 6 falling edges when M2 falls. And M2 changes *only* on falling edges of the master clock... For the duty cycle to be 17/24, M2 would have to change state on a raising and falling edges, wouldn't it? And sadly, I can't decipher die photographs (yet?), so I can't see...
by Jarhmander
Thu Oct 01, 2020 4:32 am
Forum: NES Hardware and Flash Equipment
Topic: Eccentric pedantic "monochrome" glitch
Replies: 21
Views: 10749

Re: Eccentric pedantic "monochrome" glitch

lidnariq wrote:
Wed Sep 30, 2020 3:59 pm
(Also: does anyone have a 2A03letterless and can test what the actual duty cycle of M2 is? It's not 3/4.)
Long ago, I took that measure and yes, it's ¾. Not the best measurements in the world, but it can clearly be seen.
by Jarhmander
Sun Sep 06, 2020 6:12 am
Forum: phpBB Issues
Topic: Preview after submitting posts?
Replies: 7
Views: 3034

Re: Preview after submitting posts?

Reproduced the preview thing. I just basically spam-clicked the "Submit" button, and saw my useless post in the preview. That's bad, it looks like the "submit" button just sends the post text and the server software either can't know if it has already processed the post, or just ignore/don't care th...
by Jarhmander
Sun Sep 06, 2020 6:00 am
Forum: phpBB Issues
Topic: Preview after submitting posts?
Replies: 7
Views: 3034

Re: Preview after submitting posts?

(testing double submit, ignore this/these post(s))