Do i have a dud?!

[TheRaydevil]

Hey everyone, My nice GliGli upgrade is unfortunately not going as planned... Bought a Teensy++2.0 from Tinkesphere, Prepped it as per instructions, loaded the 2.0V hex file, installed it... power on and... Nothing. Took it out again and made sure to check everything top to bottom, over and over. Everything in order. re-loaded the file a couple of time... still nothing. Finally Decided to try loading it with Imogens version 2.1, Re-installed it, power on and now i have the tuning sequence starting but crashes right after going thru the filters leaving the number 6 on the display. It just freezes like that. Tried over and over, even the GliGlis 2.0V one last time. Nothing.

I can only get it to "power up" with Imogens version but then of course it freezes. Any other version will do nothing. If i put the original Z80 back in everything works normal. I sort of lost now... Any ideas?

[matrix12x]

Did you correctly do the mods to the teensy? carefully go over to make sure the solder joints look good.

Also, if you got a teensy clone, it probably will not work. The bootloader on the clone is wrong and the Gligli software relies on the bootloader.

[TheRaydevil]

Thanks for the reply! I've gone through everything over and over. Everything looks fine. Joints are nice, everything is routed correctly. I got the Teensy board from Tinkersphere (actually followed the link posted directly on the PJRC website) so i'm hoping i didnt get a clone. LED is Orange... as i read most clones are various other colours.
Strange thing is that if i load any other versions other than the Imogens 2.1 the LED stops working. If i plug it back to the computer i get nothing. no blinking... Same when i put it in the Synth. Dead... nothing.

[image-et-son]

Do you mean this link? Even though it's been linked from PJRC, I am not convinced that these are actually original PJRC boards. Why can you preorder them? They've out of production for a long time. Sounds very strange.

And I agrre, it is most likely that you are working on a board with a bootloader that is different from the one PJRC is using. In that case, the firmware does not work.

I am still working on making the firmware work on other boards, but the outcome is totally open.

[TheRaydevil]

Yup!! That would be the one. That "Pre-order" thing is new i guess. When i bought mine they had a couple in stock. I was stoked to have found some and was pretty excited to receive it and start the project but now i see THIS... Which totally makes me think that the one i received is a stupid knock off.... 100$ Canadian including shipping for this...

[TheRaydevil]

I wrote to Tinkershere asking about that actually. Their answer was to "test the board" by trying the Slow blink Fast blink hex files to make sure my unit wasn't defective. (which i did and everything turned out fine) But they did answer the "being a clone" question.

[TheRaydevil]

And i see that they (Tinkersphere) have them back in stock now... So we most certainly know now that these are indeed clones

[Midphase]

Genuine Teensy 2.0 ++ have become unobtanium in 2025. Any possibility of making this work with counterfeit clones since that's all that is available? I too am getting stuck after the tuning routine where the display only reads 6 (or is it supposed to be G from the welcome scroll?).

Anyways, any help is much appreciated here, at the moment I fear that without a solution to run this mod on a counterfeit clone, or alternatively to port it to a newer Teensy, the GliGli Prophet 600 mod is effectively dead.

[matrix12x]

Are you running this version:
https://www.image-et-son.com/

Also, some P600s have a mux chip that over time is slow and sometimes leads to these tuning issues.
https://prophet600revisited.blogspot.com/2022/06/feedback-on-2022-beta-watch-your.html

[Midphase]

Yes, I tried it both with the latest GliGli Stable 2.0 and the latest Imogen 2022_1, on the GliGli nothing happens, like no display no nothing. On the Imogen version it goes through the Tuning Routine, after it finishes that, a "6" appears on the display and the unit is effectively frozen. If I hit the Tape In/Out buttons I can get it to go into Update mode, but beyond that nothing happens.

I did read the blog about the 4051's and this unit has the original factory TI 4051BE multiplexers...

Any other ideas? Does the EPROM Firmware revision matter?

[matrix12x]

The EPROM does not matter at all. in fact you can even remove it.

Check what versions 4051 you have. It solved my issue way back when

[Midphase]

They're all CD4051BE, here's what Imogen says about them:

"CD4051BE (Texas Instruments): fast propagation (20ns) but slow switching (>500ns). This is what I think was the Prophet 600 factory standard. It gets the job done."

I can see if I was getting stuck notes or other glitchy weirdness that being the cause, but it seems off that the Imogen Firmware would just become frozen after the Tuning Routine procedure because of the Multiplexers.

Is anyone running the Mod on a cloned Teensy successfully?

[gligli]

Hello, I bought a chinese teensy++ 2.0 and will try soon to get the self-flashing hack to work on it (which is what prevents non-PJRC teensys to work with p600fw).

[Midphase]

Wow, that would be awesome if you can figure how to get it to run, please keep us posted. I actually have two Prophet 600's here that I'd love to update. Thank you!

[Midphase]

Any updates?

[gligli]

I tried to probe bootloader addresses to find the self-flashing opcode, but no luck so far... I'll have to find a way to automate the probing so that it doesn't take days of testing each one by hand.