http://bitsavers.org/components/amd/_dataSheets/1991_79C950_CURIO.pdf
"The Apple Network Server, as well as PowerMac 9500/9600, use the CURIO
ASIC (AM79C950, custom part from AMD), also used in other PowerMac
machines, such as the 7200, to "support serial ports, a slow (5 Mbit/s, 53C94/96 based) SCSI bus and 10Mbit/s ethernet.""
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