lemonhorse

MIDIBox AY (YM) V2

50 posts in this topic

Let me introduce You the MIDIBox AY (YM) V2:

=> http://www.midibox.org/dokuwiki/doku.php?id=midibox_ay_ym_v2

20110506aMBAYV2.JPG

What is new?

* Thanks to Antix there is an YM 2149 (AY-3-8910) Board => http://www.midibox.org/dokuwiki/doku.php?id=midibox_ay_3_8912_board

* There is a new CS with Buttons (no C64 Keyboard anymore) => http://www.subfrequenz.net/midibox/mbayv2/MBAYV2CS.pdf

Edited by lemonhorse
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nice!!! any sound demos?

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It's on my todo-list now ;-)

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Update:

MIDIBox AY (YM) V2 (BUILD 20110715)

Last Changes:

* LCD: Blinking Cursor

* Debugged FX Table Function defect

@ http://www.midibox.org/dokuwiki/doku.php?id=midibox_ay_ym_v2

2 Sound Demos:

MIDIBox V2 AY (YM) + MB SEQ V2.4

YM Chip PCB (Yamaha 2149F) raw chip sound no "post production" ;-)

mbay2beispiel1.mp3

mbay2beispiel2.mp3

- Lemonhorse

Edited by lemonhorse

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Cool demos!!! Thanks!

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I knew I'd kept some 8910's for synth making from my days repairing arcade machines. I set out on an expedition into the back of my storage cupboards tonight, and finally found the big box of old chips. Wow! I did keep some weird stuff. All flavours of Z80, 6510's, 286 flat packs, about 50 6116 2K RAM chips, what seems like a tin of every EPROM ever made, (really: I found 2 1702's), and finally the sound chips. I found 7 AY8910's so far, marked 'pulls from working boards', and a couple of 8912's. I've put some on the fleamarket, since I won't need them all.

Oh, and if anyone needs any other odd chips, drop me a memo, I might just have them, for instance if you have a pressing need for some MBM93419 64x9 bit bipolar static RAM - for your 1970's supercomputer or logic analyser, I have at least 10 of them!

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the demo is great! I am a midibox and PIC noob, but i am currently working on both this and 2 mono sid boxes (one for each chip type) and I have some experience with chiptune, circuit bending and arduinos. I'm very glad to see the C64 keyboard has gone that is what has been holding me back on completing the project.

Could you please clarify the functions of the various sections. so you have three square wave oscillators, are these played on three separate midi channels? Can the envelope shape can be applied to only one channel at a time, and only one shape is selectable at a time? Also please explain the FX tab and optional functions section. You see I am wanting to limit its size as much as possible, I want the sound of the ZX spectrum without the bulk or having to spend ages loading temperamental tapes into it.

Thanks in advance

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Hello Analog Monster,

so you have three square wave oscillators, are these played on three separate midi channels?

You can assign each square wave to every MIDI Channel (1-16) you want to.

Just have a look at the LCD MENU 6 => http://www.subfrequenz.net/midibox/mbayv2/MBAY2MenueLCD.pdf

Can the envelope shape can be applied to only one channel at a time, and only one shape is selectable at a time?

Yes, it's the limitation of the AY (YM) Chip. There is only one envelope shape at a time.

But the envelope shape can be applied to one, two or all three square wave oscillators.

See LCD MENU 5.

The FX Tab:

⇒ see LCD MENU 8:

[Fx POS ] ⇒ FX POSition (the Fx tab allow 32 (POS 0-31) entries)

[Fx DELAY ] ⇒ Adjust the Fx execution timer: Wait 0-200 timer cycles

[Fx (NAME)] ⇒ Adjust the Fx FUNCTION NAME here (see LCD MENU 8 :: FX FUCTION NAMES)

[Fx PARAM] ⇒ Optional Fx Function PARAMETER

Fx execution work flow:



 -- -- --            [MIDI: Note On ::  Tone A|B|C]

    || MIDI                    ||

    || Note On                 \/

    ||          [play the user adjusted sound :: Tone A|B|C]

    ||                         ||

    \/                         \/ 

 -- -- --          [Fx Option On ::  Tone A|B|C]

    ||            [Timed Execution of Fx events]

    ||                        ||  

    ||                        ||

    || Fx                     ||

    ||                        ||

    ||                        ||  End of Fx execution:

    ||                        ||  1) When a "End Fx" Function appear

    ||                        ||  2) When a MIDI "Note Off" event appear

    \/                        \/  3) After Fx Pos. 31 (31 => last Fx Position)

 -- -- --                -- -- -- -- --

    ||                        ||  [Fx Loop option]

    ||                        ||

   . . .                     . . .

    ||                        ||

    || Fx Loop                ||

    || (GO BACK to Fx POS. X) ||

    ||                        ||

    ||                        ||

    \/                        \/   Fx Loop (end via MIDI Note Off)

-- -- -- --               -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --


Edited by lemonhorse

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Sorry for being an idiot and not realizing most of the info is already there. The main thing is I have realized I definitely want the FX section, as with a little patience I should just about be able to program some kick and snare sounds. Thanks for the info

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Hello Analog Monster,

I have realized I definitely want the FX section as with a little patience I should just about be able to program some kick and snare sounds.

:)

Just a hint: You will need all buttons - for it's not possible to use all MBAY(YM)V2 options just with the Value/Item/Menu Buttons.

⇒ http://www.subfrequenz.net/midibox/mbayv2/MBAYV2CS.pdf

Edited by lemonhorse

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Hi! Nice work!

Any Eagle PCB files? (for AY/YM boards)

Best regards

IGI

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Hello igi,

You've got a PM.

Edited by lemonhorse

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Hi Antix,

I like this (your first MB-YM2149 board)!

:)

Regards,

- Lemonhorse

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I really like your project

I have a couple of chips and I'm thinking about building it

I have a question about the envelope shapes

you have 8, but in the spec sheet it states 10

are some of them the same or similar?

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Ok, yeah, I see it now

thanks

I have a 40 pin YM2149F and a 28 pin AY-3-8912A

do they sound the same?

any preference?

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> do they sound the same?

I think so, yes. But I can't tell. I had fun with both chips, but not at the same time.

I just got one MB AY(YM) and did no comparative soundtest yet. No preference on my side.

Edited by lemonhorse

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Please update to MBAY V2.1

* MIDI Program Change implemented (0 = Load Internal Patch, 1-127 = load Bankstick Patch)

* Found a Bug in Fx Function (Note#1-3 ABC)

* Some MIDI CC LCD Screen refresh improvements

* GATE (0V / +5V) - Core8 J14 @TONE A MIDI CH » Note ON (+5V) Note OFF (0V)

=> http://www.midibox.org/dokuwiki/doku.php?id=midibox_ay_ym_v2#software

Edited by lemonhorse

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I found 33 x AY38912/P in my stash, all unused, all from the same batch.. I guess they should all work..

Boards on order, can't wait to get stuck in to this!!

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hi mrspring,

wow 33 AY chips! :)

are the chips from microchip?

i ask because some of them (AY38912A/P, AY38910A/P) have no noise - just tone abc.

no problems with:

GI AY38912 CDA, Yamaha YM2149F (let me know if you have successfully tested other chip devices!)...

Edited by lemonhorse

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