Powerbook 100 scsi chip

AM85c80 Which is a combined SCSI Serial IC. Apple referred to it the "Combo Chip" in hardware development notes, e.g. PowerBook 100 Hardware Developer Note.

SCC and SCSI interfaces
A custom chip called Combo combines the functions of the SCC and the SCSI controller in a single device. This device is completely software compatible with the SCC (85C30) and SCSI (53C80) chips it replaces.
 
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