Posts by Orgia Mode (Page 5) - Forums

65 Reply by Orgia Mode Nov 29, 2019 5:50 pm

Re: opinions on using using more modern devices for chip music. (41 replies, posted in General Discussion)

ドラゴンJOKE wrote:

I have a question related to this discussion: what's fakebit? Is it also tracker music?
And can 'Feel so real' by Unicorn Kid be considered fakebit?

Fakebit is the term used to exaggerate the size of one's perceived genitalia over people on the internet who use software music making tools that do not contain authentic hardware programmable sound generators.

idk what a unicorn kid is (everyone identifies with something nowadays) but you're probably setting me up for a joke...

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66 Reply by Orgia Mode Nov 20, 2019 11:03 pm

Re: Casio Pt-80 to midi drum machine? (8 replies, posted in Circuit Bending)

Hawk may be right about sampling.

But for the sake of scientific experimentation, I want to know more about the internal drum triggers. If you can probe pins on the ICs, you may be able to locate the physical points where we can trigger the drums. Get yourself a wire and resistor(10k-100k), connect it to a ground point and use the other end of the wire to poke pins until you get some noises. If The ground connection does nothing for you, try it with +5v and the resistor of course. The resistor should protect against shorts.

IF you are able to find physical points to trigger the drums, an arduino code to output the appropriate high or low-edge trigger on any number of output pins with a midi input.

Go to forum: Circuit Bending Go to topic: Casio Pt-80 to midi drum machine? Go to post 66

67 Reply by Orgia Mode Nov 2, 2019 3:30 am

Re: Kid Vid Voice Module (5 replies, posted in Atari)

Never seen one, so maybe its rare, but of course it plays tapes. Thats the point of it after all. Computers of the age used cassette decks as I/O so its probably compatible with a lot of them from that age. My Apple II for example uses a 3.5mm jack for audio in and out.
Now-a-days you can use a simple PC program and an audio card to emulate these. SO I think you're better off selling it on ebay as a collector's item.

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68 Reply by Orgia Mode Oct 29, 2019 5:29 pm

Re: Open Source Mega Drive MIDI Interface (10 replies, posted in Sega)

Does the Everdrive support serial eeprom as memory yet?

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69 Reply by Orgia Mode Oct 27, 2019 4:54 am

Re: Open Source Mega Drive MIDI Interface (10 replies, posted in Sega)

As you know, Little-Scale's firmware is closed, but Catskull's boards can be updated via the ICSP pins that I broke out on the bottom and potentially via the on-board USB connector. I'll ask Cats if he programs them with the USB or ICSP connector.

EDIT: He said you have to use the ICSP connector on the back because it doesn't have a bootloader.

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70 Reply by Orgia Mode Oct 26, 2019 7:47 pm

Re: Open Source Mega Drive MIDI Interface (10 replies, posted in Sega)

All of your ideas sound great. Except for the requirement of the Everdrive.
There are a few options such as port 2 and port 3 and since not all Sega's have a port 3, go with port 2.
Read this:
https://digital.library.adelaide.edu.au … 11_PhD.pdf

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71 Reply by Orgia Mode Oct 24, 2019 12:46 am

Re: Replacement DMG Regulator Board Open Discussion [WIP] (7 replies, posted in Nintendo Handhelds)

I remember that project, just assumed he used the original board.
Good part, but yikes! Its pricey. I was looking at similar parts, but they all range between 5 and 9 USD for just the inverter.

I think I will experiment with the voltage. When testing the regulator board, it outputs about -22v unloaded and then drops down to the usual -18.0 to -18.6v with a 22k load. Its just a little sketchy. Too much load on the negative rail actually shut down the 5v rail to 0.

EDIT: And the RO-0524S part is physically huge!

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72 Reply by Orgia Mode Oct 23, 2019 10:29 pm

Re: Replacement DMG Regulator Board Open Discussion [WIP] (7 replies, posted in Nintendo Handhelds)

Knife Crimes wrote:

There's another schematic here: https://gbdev.gg8.se/wiki/articles/DMG_Schematics. Pretty sure the mystery part is a flyback transformer.

Oh nice. I literally looked at that page today for another schematic and have always glazed over that portion of the pic. It seems to be from one of the older "DC CONV DMG" boards where as I chose to draw (one of) the "DC CONV2 DMG."

I currently have three different revisions of the board on hand.

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73 Reply by Orgia Mode Oct 22, 2019 8:38 pm

Re: Replacement DMG Regulator Board Open Discussion [WIP] (7 replies, posted in Nintendo Handhelds)

Here is the original "DC CONV2 DMG" board. Problem is, I can't identify everything. For starters, the large barrel shaped part completely eludes me and 3/5 of the diodes have absolutely no markings. The transistors are labelled but the code for Q4 could potentially point to an NPN or PNP.
And since I can't figure out what the big part is, simulations in LTspice don't do a whole lot for us.

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74 Topic by Orgia Mode Oct 21, 2019 6:39 pm

Topic: Replacement DMG Regulator Board Open Discussion [WIP] (7 replies, posted in Nintendo Handhelds)

What do you all want out of a replacement regulator board?
Low heat?
Low noise?
High efficiency switching?
Smaller dimensions?

Me too.

So what do we need to do? The circuit has to output +5v and -18v from a single raw input of +6v. Now, they make ICs that are called voltage doublers and inverting doublers utilizing a strange collection of capacitors, diodes and an oscillator all in one chip (although sometimes you have to provide the large caps). I have found that these chips are a little more expensive than I would hope for just one of the many components we'll need on the board... And the cheaper ones a lot of times use oscillators within the audio range...

So I think I'll try designing a discrete voltage doubler (probably tripler) oscillating at 20k+ Hz and then use an off the shelf -18v regulator to make sure it doesn't drop too much when the batteries start to die.
The +5v rail should be very easy.

Does that all sound logical? Who has played with voltage doublers? Any comments?

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