Midi Merge Technique? (Jitter)

[Fraser, Colin J]

> -----Original Message-----
> From: Byron G. Jacquot [mailto:thescum at surfree.com]
> Sent: 25 January 2000 03:44
> To: synth-diy at mailhost.bpa.nl
> Subject: RE: Midi Merge Technique? (Jitter)
> 
> >This gives us a maximum delay from the loading of the clock 
> byte into the
> >transmitting UART, to setting the data ready flag at the 
> receiving UART of
> >well under 1ms.
> >Theoretically, not a problem.
> 
> As long as you don't have somewhat full hardware FIFOs 
> standing in the way!

I've never found a UART with a hardware FIFO outside of a PC.
I normally use 6850 ACIAs.
You need to be quick to get the received byte out of them before the next
byte appears.
If you can't read the data from the UART fast enough to do without a
hardware FIFO, then you need a faster processor, or better code.

> It wound't be that great a DIY project to make a little 
> master clock module,
> either.  It could have an onboard tempo oscillator (as stable 
> as you care to
> make it), start/stop/continue buttons, with MIDI, DIN, and 
> maybe 16th note
> pulse outputs...plus an extra blinking light or two.

With multiple din outputs that can independently add shuffle to grooveless
drum machines.
And an infra-red or radio remote control unit with tempo and run/stop
control ;-)
Hmm...
Another project to add to the list.


Colin f