Let me introduce You the MIDIBox AY (YM) V2:
=> http://www.midibox.org/dokuwiki/doku.php?id=midibox_ay_ym_v2
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
nice!!! any sound demos?
It’s on my todo-list now 
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”
Very nice indeed 
Cool demos!!! Thanks!
Lemonhorse: your demos made me smile.
As soon as I build this, I need to recreate the theme from “SNAFU” 
Thanks for your feedback!
Just updated the “User Menu (LCD)” pdf - now it comes with some additional comments (F1-F8 Button)
@ http://www.midibox.org/dokuwiki/doku.php?id=midibox_ay_ym_v2
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!
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
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)
-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
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
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.
MIDIBox AY (YM) V2.0A (BUILD 20110909)
http://www.midibox.org/dokuwiki/doku.php?id=midibox_ay_ym_v2
Comes with new FX Editing Shortcuts: http://www.subfrequenz.net/midibox/mbayv2/MBAY2MenueLCD.pdf
Hi! Nice work!
Any Eagle PCB files? (for AY/YM boards)
Best regards
IGI
Hello igi,
You’ve got a PM.
Hi Lemonhorse,
the documentation about Ym/AY is going to be very fine.
I like this
http://www.subfrequenz.net/midibox/mbayv2/MBAY2MenueLCD.pdf
Regards
Antix
Hi Antix,
I like this (your first MB-YM2149 board)!
<___base_url___>/gallery/image/939-ym2149/?do=embed
Regards,
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?
Hello Eptheca
> are some of them the same or similar?
yes.
http://www.subfrequenz.net/visuals/albums/userpics/MBAY38912ENV.jpg
Best Regards
