Search found 64 matches

by fred
Mon Aug 26, 2019 2:18 am
Forum: SNESdev
Topic: Reverse-engineering multi-joint bosses
Replies: 9
Views: 6148

Re: Reverse-engineering multi-joint bosses

Yeah, I also associate multi-joint sprites with the mega drive. Konami did use the effect in a few snes games though - contra 3 has that strange "genesis bike" mid-boss in stage 3 (and some other joint stuff), and sparkster has jointed sprites all over the place. Might be those general purpose routi...
by fred
Tue Aug 13, 2019 12:19 pm
Forum: SNESdev
Topic: Hardware - emulator discrepancy: super ghouls n ghosts
Replies: 7
Views: 8371

Re: Hardware - emulator discrepancy: super ghouls n ghosts

It's not only for speedrunning, but most active community members are speedrunners haha.
by fred
Sat Aug 10, 2019 12:39 am
Forum: General Stuff
Topic: Building a simple active scart splitter?
Replies: 11
Views: 7925

Re: Building a simple active scart splitter?

Hmm, yes, you're right. Not sure why i didn't think of that. I can't see how that's the case, but i'll examine the circuit again.
by fred
Fri Aug 09, 2019 3:14 am
Forum: SNESdev
Topic: Hardware - emulator discrepancy: super ghouls n ghosts
Replies: 7
Views: 8371

Re: Hardware - emulator discrepancy: super ghouls n ghosts

Yes, we have a discord server! Feel free to join!
by fred
Thu Aug 08, 2019 7:10 am
Forum: General Stuff
Topic: Building a simple active scart splitter?
Replies: 11
Views: 7925

Re: Building a simple active scart splitter?

Crossed the audio & composite wires and... well, got something! Here's the 240p test suite: https://i.imgur.com/4FmmRRX.jpg It's black & white, but at least the image is quite crisp! I had expected it to look worse. Tried disconnecting some color wires and actually got color output, albeit a bit dar...
by fred
Mon Aug 05, 2019 5:55 pm
Forum: SNESdev
Topic: Hardware - emulator discrepancy: super ghouls n ghosts
Replies: 7
Views: 8371

Re: Hardware - emulator discrepancy: super ghouls n ghosts

Here's another fun one. Noticed mesen-S would draw a line of garbage on the stage 3 boss, never seen this in higan so did some digging. Compiled a list of screenshots from real HW as the player walks into the boss trigger: https://imgur.com/a/83Pusr3 This bug appears to happen somewhat often, but on...
by fred
Tue Jul 30, 2019 5:09 pm
Forum: General Stuff
Topic: Building a simple active scart splitter?
Replies: 11
Views: 7925

Re: Building a simple active scart splitter?

Oh... yes, i see now what you mean... haha. Thanks for pointing that out!
by fred
Tue Jul 30, 2019 1:39 pm
Forum: General Stuff
Topic: Building a simple active scart splitter?
Replies: 11
Views: 7925

Re: Building a simple active scart splitter?

Alright, the first round of testing failed but not for the reasons I would have assumed haha. I took two scart ports and wired the R, G, B and composite signals (for sync) pins through the opamp circuit. The other necessary pins (like audio and the various gnd pins) I just connected between the scar...
by fred
Sat Jul 27, 2019 8:01 am
Forum: SNESdev
Topic: Hardware - emulator discrepancy: super ghouls n ghosts
Replies: 7
Views: 8371

Re: Hardware - emulator discrepancy: super ghouls n ghosts

Yeah, that sounds about right. It's one of the earlier snes games and has a lot of wonky stuff under the hood haha.
by fred
Fri Jul 26, 2019 5:02 pm
Forum: SNESdev
Topic: Hardware - emulator discrepancy: super ghouls n ghosts
Replies: 7
Views: 8371

Hardware - emulator discrepancy: super ghouls n ghosts

I already posted this on the snesdev discord, but figured i'd post in on a more static part of the internet. Super Ghouls n Ghosts has a rare bug that sometimes makes the game play the wrong music or sound effects. Happens on the JP version (chou makaimura), can't say for certain it happens on the U...
by fred
Sun Jul 14, 2019 5:34 pm
Forum: General Stuff
Topic: Building a simple active scart splitter?
Replies: 11
Views: 7925

Re: Building a simple active scart splitter?

Haven't gotten the parts required to build a test yet. In the meantime i found another video line driver from a opamp datasheet, this time AC coupled with a biased input. Could be extended to a splitter rather easily i'd think. I'll try the inital schematic first though. https://i.imgur.com/P7MyHn8....
by fred
Tue Jul 09, 2019 4:41 pm
Forum: General Stuff
Topic: Building a simple active scart splitter?
Replies: 11
Views: 7925

Re: Building a simple active scart splitter?

Oh, so it's not an AC signal on paper, but you can sort of-kind of treat it as one. I think i understand that.
For the opamp, I'll go with split supply to make things simpler then.

Thank you so much for the help! I'll try to get a prototype going and see what happens haha.
by fred
Mon Jul 08, 2019 5:06 pm
Forum: General Stuff
Topic: Building a simple active scart splitter?
Replies: 11
Views: 7925

Re: Building a simple active scart splitter?

Wow, that's a lot of useful information, thanks! My interest has mainly been in audio so i've never really had to think about bandwidth & slew rate, haha. Started to realize it was going to be a problem when trying to read up on video signals... Another question and some musings if you're not bother...
by fred
Sun Jul 07, 2019 4:55 pm
Forum: General Stuff
Topic: Building a simple active scart splitter?
Replies: 11
Views: 7925

Building a simple active scart splitter?

So I was wondering if something like this is possible. I want to split RGB video over scart and figured I should be able to make something myself. I only have a pretty basic grasp of electronics but I figured I could split the signal with opamps. I found this example schematic straight from a opamp ...
by fred
Tue Feb 19, 2019 8:13 am
Forum: NESemdev
Topic: DPCM/Controller Glitch emulation
Replies: 19
Views: 12489

Re: DPCM/Controller Glitch emulation

Sour wrote:(esp. since my time is currently all being spent on trying to build a SNES emulator)
Cool! Looking forward to hearing more about that later! :shock: