Emax

I have just downloaded the Teensy++2.0 HEX firmware from my website and uploaded it into a Teensy++ 2.0.

I also have built the circuits of the EmuSer with this Teensy++2.0 on a breadboard, and tested it with an Emax SE/Plus and EMXP.
See picture in the photos section:
http://groups.yahoo.com/group/emax/photos/album/1383123911/pic/1129124448/view?picmode=large&mode=tn&order=ordinal&start=1&dir=asc

As you may guess and derive from the picture... it works like a charm.

Are you sure your Emax doesn't have a problem with its RS422 port on high speed ? A good test (but maybe not obvious for everyone) would be to test your EmuSer board on another Emax and/or test the Emax with Sound Designer for Emax on an old Mac ?

I assume you are using a correct Emax OS version (only SE, SE/HD and Plus support RS422 transfers)?

On the electronics side, you could try some alternatives, e.g. by removing the LEDs and/or by removing the small capacitors C4 and C5. These components can influence signals; the capacitors were specifically added for the Emulator II rev 1, and also work fine with my Emax and Emax-II samplers, but maybe some Emax revisions may be more sensitive to them... (the original prototype which was created for Emax did not have LEDs nor these capacitors...)

///E-Synthesist


--- In emax@yahoogroups.com, "Adam" <fake@...> wrote:
>
> "I will check if the latest Teensy++ 2.0 boards sold by PJRC are still exactly the same ones as I have used here in 2010"
> 
> Paul @ PJRC confirmed:
> 
> "All Teensy++ 2.0 boards should be identical.  They are all the '1286 chip, same circuit board and other parts.
> 
> I have some that were recently built with the '1287 chip (the same, but has extra features), but so far we haven't sold them, except to a couple people who specifically asked."
> 
> "and I will also double check if the HEX file provided for the Teensy++ on my website is really the correct version and that I didn't make a mistake with that one. "
> 
> it would be very kind from you.
> 
> thanks!
>