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1636

Other / Re: TI84+ soundchip - arduino SID emulator

« on: January 18, 2013, 09:50:14 am »

I am tweaking the link protocol. Now I get speeds up to 380B/sec on normal.

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News / Re: TI-84 Plus C Color official press release

« on: January 18, 2013, 08:47:43 am »

Same with unix systems.

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News / Re: TI-84 Plus C Color official press release

« on: January 18, 2013, 08:18:49 am »

Is ASM support not synonymous to full access to all features of the device?

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Other / Re: TI84+ soundchip - arduino SID emulator

« on: January 16, 2013, 06:01:07 pm »

I started working on a music editor. It will export files that can be played back in a game for example. Just include a file with the subroutines to play back the songs.
I can now edit notes while the calc plays pattern loops at the same time.

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Other / Re: TI84+ soundchip - arduino SID emulator

« on: January 16, 2013, 03:12:38 pm »

You cannot. Not with the code that's on it at the moment. I could add that some day.

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Other / Re: TI84+ soundchip - arduino SID emulator

« on: January 16, 2013, 03:09:05 pm »

Nope you have to send register addresses and register values.

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Other / Re: TI84+ soundchip - arduino SID emulator

« on: January 16, 2013, 01:54:09 pm »

Hmmm perhaps I should not include texas instruments. They are not in the credits list.

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Other / Re: TI84+ soundchip - arduino SID emulator

« on: January 16, 2013, 01:16:20 pm »

I made a poll.

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Other / Re: TI84+ soundchip - arduino SID emulator

« on: January 16, 2013, 02:22:49 am »

At the moment the speed of the byte transfer is about 110B/sec on normal and 250B/sec on full. I had to add a total delay of pause 3 to get this to work, so perhaps with some optimization on the arduino end I can reduce this delay. To do simple notes you only have to write 3 bytes (plus one to stop the note) 2 bytes for pitch and one for gate/control. That's 27ms per note on normal. I might add "glide" effects to the arduino code to compensate for this slow transfer.

Oops. Multiply that by two since you have to write the address as well, so that makes 6 bytes per note and 54ms/note.

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Other / Re: TI84+ soundchip - arduino SID emulator

« on: January 15, 2013, 01:12:03 pm »

The attiny45 does not have enough program memory and I don't know if it will compile for the attiny since it outputs the sound on pin 9 by default. Maybe you can change this in the library headers, but I doubt it's gonna compile for the attiny that easily. This sketch as it is takes up 5k. So that won't fit in 4K of program space the attiny45 has. (I only have that kind) The attiny85 on the other hand will hold up to 8k of program data.

The midi port fits in a box just fine. It depends on the size and shape of the box. My idea with the TI-nterface was to have a big plastic enclosure that slides over the top of the calculator. A midi connector on top would be no problem.

Also: I have to come up with a cool name:
TIMID (TI+MIDI+SID)
Zound80
*insert more idea's here*

Edit: Mockup for a music editor. Just a concept. Don't get too excited

I posted the source code for the link protocol on cemetech:
http://www.cemetech.net/forum/viewtopic.php?t=8685&sid=e532c97cb52c8e4552e4721f6461870d

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Other / Re: TI84+ soundchip - arduino SID emulator

« on: January 15, 2013, 10:49:08 am »

I do not own a nspire, but if it has two I/O lines to work with I can easily implement it. I just shift out the data from the calculator with one data line and one clock line.

Without the midi function. Old picture, but shows the size of the board

With the midi connector and an on/off switch. It runs off the calculators batteries. An atmega MCU runs fine on 4v-5v, but 6v will damage it. I added a diode to lower the voltage a bit.

There you have it! It's almost what I had in mind for my profile essay: TI-nterface. I can still add code for GPIO (changing the state of the I/O pins).

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Other / Re: TI84+ soundchip - arduino SID emulator

« on: January 15, 2013, 04:56:37 am »

Quote from: Sorunome on January 14, 2013, 11:15:51 pm

Nice! Now just build it INSIDE of a calculator

That's the next step. First I want to make sure it's flawless. I will also add the original midi out code to the chip. This project was based around the code of my midi interface.

Edit: The midi feature is now implemented. I can now send midi messages as long as they are 3 bytes in size. With a jumper setting I can set the soundchip to SID or MIDI mode.

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