Analogue-sequencer

OK, I had the Logic Analyzer connected without the
display.  When I connect the display I get what seem
to to be correct waveforms.  But, alas, still no
display.  So, I'm going with my first assumption that
the display is broke.  The rest of the P3 seems to
work.  I press Play and the lights dance around.  Just
no display.  

As far as the code, it is whatever was shipped with
#33.  I'll have to wait until I get a display to check
the version.  Then I'll have all kinds of questions on
how to upgrade to v4 from whatever I have.  I know
there were some bootloader changes along the way that
I don't have.

thanks

dave


--- Colin Fraser <colin@sequentix.com> wrote:

>  
> > I have more info now.  The RS, R/W, and CE signals
> for the display
> > only output 3us pulses.  According to the PLED
> datasheet they should
> > remain high/low for the duration of the
> read/write.  Also, only
> > DB0-DB2 show any activity.  Any ideas?  Thanks
> 
> The communication between the CPU and PLED module
> amounts to:
> "wait for the LCD to be ready"
> "read/write to/from the selected register"
> 
> If the module is disconnected or bad, the CPU can
> wait forever for it to be
> "ready", and will not appear to boot.
> The "ready" bit is DB7.
> Zero is ready, one is busy.
> You can fool the CPU into thinking it has a working
> PLED attached by
> connecting pin 14 of the LCD interface (DB7) to pin
> 1 (ground).
> If that doesn't make it boot and flash its LEDs, you
> could have a problem
> with the main PCB or the code on the CPU.
> 
> Best regards,
> Colin Fraser
> Sequentix Music Systems Ltd
> http://www.sequentix.com
> 
> 
>