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[Midibox AY 3 8912... ]


lemonhorse
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Correct me if I'm wrong it just affects volume of the channels?

yes.

ayreg.jpg

the ay 3 8912 chip provide three amplitude regs (R10,11,12 - volume/amplitude register a b c: 0-15 dec. [=>4bits: L0 L1 L2 L3]) for the  channel a/b/c.

AYSOUNDDETAIL.jpg

this is the internal volume handling of the AY 3 8912 chip.

the MIDIBox AY 3 8912 will be equipped with a (user)menu for volume (tone a b c) [volume pre-adjustment 0-15 dec.]. furthermore it's planned that the volume of tone a/b/c will be controllable via control change and velocity (switchable). the mixer module was just designed for mixing the tone a/b/c and for fine justification of the volume level.

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how can you control sound parameters with just a keyboard, wouldn't you need at least 1 encoder

The Menu/Parameter handling is unfinished at the current stage of the Project - but I would like to leave all interaction to the C64 keyboard. Nevertheless I hope the user work flow will be some kind of handy in the end (...it's because - my first Computer was a Commodore64 - and first love never dies ;) )

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I get it but still i dont see how you couldn't change and LFO for instance with just buttons because you couldn't change it at just the speed you wanted but get close.. oh well :D

buttons, believe it or not, are actually more accurate, encoders are more intuitive maybe...  it's a preference thing not a necessity thing.  you are referring to the interval between values that can be achieved and that would be the same with either encoder or buttons.  it's up to the hardware and the guy programming it.

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  • 2 weeks later...

I just got an issue with the sm 8x8 keyboard driver - some keys working fine  - but there are some other keys with strange behavior (as F1, F3, F5, arrow up, Q, E, T, U, CTRL... ). They do not only toggle once (on/off) - those keys toggle several times (never-ending - actually with diffident values like key F3). I took another keyboard - same results.

I furthermore made a cross check with http://www.ucapps.de/mios/sm_example2_v1b.zip

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It sounds almost like a debounce problem but I notice that the keys you mention are only within a certain section of the keyboard, and are on the same columns in the matrix. I'd be looking for shorts and loose connections, and diodes in backwards.

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anyone know a source where i can get 1 of these chips? Everywhere i see has a minimum order.

I took my AY 3 8912 chip from an old and broken arcade board - but such boards are hard to find.

AY-3-8912 / ay38912 ($6.50)

http://www.arcadechips.com/product_info.php?cPath=27_22&products_id=111

AY-3-8912  - IC AY-3-8912 Sound Generator (€9.00 (Excl. VAT))

http://www.parts4pinballs.com/index.php?currency=EUR&manufacturers_id=9&sort=3a&filter_id=14

[deleted]

Hard-to-find Integrated Circuits (USA)

http://mysite.verizon.net/res8aiig/ICparts/ICparts.htm#AY38912

Bassenberg (Kiel, Germany)

http://www.bassenberg.de/request.php/products_id/2666/AY-3-8912.html

Elektronische Bauteile (german)

http://www.flipperwerk.de/Elektronik

The only shop I personally know is Bassenberg. If You wand me to ask Jörg Bassenberg for a AY 3 8912 I will do  :)

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Perfect for a group buy.

Since I'm collecting different chips for projects, and I'm interested in this one, I might be willing to run the group buy if I can get some advice from Wilba or SmashTV on international shipping of IC's - how to keep the cost down, etc... I live in the USA, so if I purchased 100 of these IC's, shipping would be $77 USD to my address. Total cost for 100 chips would be $102.95. That comes out to $1.03 per chip. Then add on shipping charges to wherever purchasers live (that is where I would need assistance).

Wilba since you have shipped SID's all over the world, your assistance would be greatly appreciated. Smash - since you live in the US and ship internationally and domestically, you might have some good advice, as well.

I would use the PayPal option, like other group buys. Most likely run it just like Wilba did the SID Mega-Sales.

However, the only caveat would be testing the chips when they got here. Any ideas on how to test these once I received them?

They only have one chip available. Someone please downgrade my forum status from "Midibox addict" to Midibox Retard, please.

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