My project would probably be quite difficult to interface to a Macintosh as it uses parallel data and the Mac doesn't really have a suitable parallel interface. But it does have serial interfaces and there are plenty of serial ADC chips around.

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What rate of change of data are you expecting? If you are doing serial, you need the baud rate to be at least 10 times the sample rate. Also two standard parallel interfaces for macs are (a) NuBUS and ( B) SCSI.

Most modern Macs have a sound input port, which I count as an ADC.