HP Deskjet 990cxi Printer - Manual (Page 72)

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More About Your Printer: System Requirements
System Requirements
Be sure your computer meets the following system requirements:
USB Connection:
PowerPC MacOS-based computer with a USB port
MacOS version 8.
6 or later
Minimum 32 MB RAM, 64 MB recommended
8 MB (minimum) available hard-disk space
AppleTalk Connection:
68030 or 68040 Mac or PowerPC MacOS-based computer
MacOS version 7.6.1 or later
Minimum 32 MB RAM, 64 MB recommended
8 MB (minimum) available hard-disk space