[sdiy] New to list - and DSP development

[Magnus Danielson]

From: Ingo Debus <debus at cityweb.de>
Subject: Re: [sdiy] New to list - and DSP development
Date: Sun, 12 Dec 2004 15:09:30 +0100
Message-ID: <70A56290-4C47-11D9-9504-000A9571C136 at cityweb.de>

> 
> Am Sonntag, 12.12.04 um 06:20 Uhr schrieb Kenneth Elhardt:
> 
> > That's what I've always thought, but was thrown off when Inside Mac 
> > only
> > showed the serial ports going up to about 57K Buad.  That's quite far 
> > off
> > from 2MHz.  Perhaps there's another way to set the port speed I've 
> > missed.
> >
> MIDI is 31.25 kBaud. The external clock (1MHz in most cases) is 
> required because this baud rate cannot be generated by dividing down 
> the internal clock.

The Mac serial ports have a _very_ nice feature in that you can supply an
external clock signal to it. It's well documented in the Inside McIntosh books.
I never was much of a Mac fan, but my brother was (and still is). I still have
a MacIntosh Classic to fool around with if I ever would feel like it.

I did however fail to make a MIDI-interface to it myself. Probably only a
minor mistake of some sort. Maybe I should get it going.

A MacIntosh MIDI interface is really a double interface, since you need to
signal-level convert in two steps rather than one if you go straigh from a
UART.

Cheers,
Magnus