ComputerVoltageSources

The schematic for the LCD implies that it can be a stand-alone MIDI
monitor; that is, it does not require the CVS PCB for this function. 
Am I correct?

Thanks,
mrmike

Correct.  See item #12 in the database FAQ.

John added the MIDI circuitry to the LCD PCB so it would support the 
Synthmodules PSIM module, providing both MIDI and display capability.

I added a separate mode in the firmware for a MIDI monitor.  The 
wires shown on the schematic connect the MIDI input circuitry to the 
processor and ground a control pin that forces MIDI monitor mode.

Note that to display the hex data stream takes three character 
positions so with only a 32 character LCD you can display the last 
11 bytes.

I have used this to decode some of my synths to figure out exactly 
what continuous controller messages are used, what power-up 
initialization sequences are sent, and when and if the synth uses 
running status.

Note that if your MIDI data stream uses MIDI clock or active sense, 
the display will be worthless since these streams will dominate the 
display.  Sysex dumps are equally worthless since you can only see 
11 bytes of data.

Dave


--- In ComputerVoltageSources@yahoogroups.com, "clickmrmike" 
<mrmike@...> wrote:
>
> The schematic for the LCD implies that it can be a stand-alone MIDI
> monitor; that is, it does not require the CVS PCB for this 
function. 

> Am I correct?
> 
> Thanks,
> mrmike
>

Yes, I think Dave Brown has a photo on his web site.  Keep in mind that it
displays simple hex, not decoded messages with text descriptions.

John Loffink
The Microtonal Synthesis Web Site
http://www.microtonal-synthesis.com
The Wavemakers Synthesizer Web Site
http://www.wavemakers-synth.com

> -----Original Message-----
> From: ComputerVoltageSources@yahoogroups.com
> [mailto:ComputerVoltageSources@yahoogroups.com] On Behalf Of clickmrmike
> 
> The schematic for the LCD implies that it can be a stand-alone MIDI
> monitor; that is, it does not require the CVS PCB for this function.
> Am I correct?
>

Yes, in my photo album, although this is a photo of my custom 2x40 
LCD.  You just have to imagine it as a 2x16 LCD.

Also, if you do want decoded messages, you can do this with a CVS.  I 
have all the MIDI protocol running so you just have to add the 
display statements.

Dave

--- In ComputerVoltageSources@yahoogroups.com, "John 
Loffink" <jloffink@...> wrote:
>
> Yes, I think Dave Brown has a photo on his web site.  Keep in mind 
> that it displays simple hex, not decoded messages with text
> descriptions.
> 
> John Loffink
> 
> > -----Original Message-----
> > From: ComputerVoltageSources@yahoogroups.com
> > [mailto:ComputerVoltageSources@yahoogroups.com] On Behalf Of 
clickmrmike
> > 
> > The schematic for the LCD implies that it can be a stand-alone 
MIDI
> > monitor; that is, it does not require the CVS PCB for this 
function.
> > Am I correct?