sync24 specifications

[theoms at nettaxi.com]

Maybe you can get some help on this pages
http://pages.hotbot.com/edu/syncon/diner.html
http://www.users.globalnet.co.uk/~clutter/html/index.html

> ** Original Subject: RE: sync24 specifications
> ** Original Sender: "Byron G. Jacquot" <thescum at surfree.com>
> ** Original Date: Tue, 20 Jun 2000 17:09:41 -0700

> ** Original Message follows... 

>
> >Most of my gear operates reliably up to 300 BPM.
> >At 24 PPQ, thats 8.33ms per cycle or 4.17ms On-time per pulse at a 50% Duty
> >cycle.
> >
> >I think I remember reading somewhere that even 2ms On-time is fairly stable
> >with most gear.
> 
> Of the DIN boxes I've ever used, I think the TR808 is the most picky.  I've
> got a MIDI-CV/DIN box that outputs a fixed width pulse when it recieves a
> MIDI clock tick.  I think it's 2 mS, but I'd have to check it to make
> sure...the 4 mS mentioned ablve might be wide enough to guarantee that it works.
> 
> (thinking from a programmatical standpoint, the DIN clock line probably
> interrupts the processor, telling it that it's time for the next step.  From
> the schems I've seen, it's not synchronized with a latch/flipflop.  But most
> processors only interrupt between instructions...as old as they are, and as
> slow as they are, the processors in those old boxes might spend considerable
> periods where they can't be interrupted...just a theory as to why this happens)
> 
> 2 mS is too narrow to reliably sync a TR 808!  It starts to miss clock
> pulses, and lags behind.  I've been thinking aobut stretching the pulse with
> a monostable multivibrator, but have a lot of other things on my plate right
> now...and have other means of reliable DIN sync.
> 
> Byron Jacquot


>** --------- End Original Message ----------- **

>