Path: utzoo!attcan!uunet!dino!sharkey!umich!samsung!cs.utexas.edu!rosen
From: rosen@cs.utexas.edu (Eric Carl Rosen)
Newsgroups: comp.sys.mac.hardware
Subject: Re: SID II data rate?
Message-ID: <12956@cs.utexas.edu>
Date: 28 Sep 90 02:44:34 GMT
References: <1990Sep27.165443.2923@d.cs.okstate.edu>
Organization: U. Texas CS Dept., Austin, Texas
Lines: 14

In article <1990Sep27.165443.2923@d.cs.okstate.edu> norman@d.cs.okstate.edu (Norman Graham) writes:
>How does the SID get its info to the Mac without overrunning
>the serial ports? It samples 22K 8bit samples per second, but
>without compression it would seem to require a data transfer
>rate of 176Kbps. What am I missing here?
>
>--Norm

This puzzled me as well until Mike Ciholas kindly explained. The Macintosh
serial ports can be externally clocked at data rates far higher than the
available internal clocking rates. The clock is generated by the SID and 
drives both the ADC and the serial port (pin 1 -- HSO).

--Eric