HP Color Inkjet cp1160 Printer series - Manual (Page 204)

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system requirements
Your computer must meet the following minimum requirements:
Microsoft Windows NT 4.0 or 2000
Minimum Processor Speed: Pentium 133 MHz
Required RAM: 64 MB
Required Free Hard Disk Space: 40 MB*
Microsoft Windows 95, 98, or Me
Minimum Processor Speed: Pentium 150 MHz
Required RAM: 32 MB
Required Free Hard Disk Space: 40 MB*
DOS 3.3 or better
Minimum Processor Speed: 486
Required RAM: 4 MB
Required Free Hard Disk Space: 40 MB*
* If you are printing photographs, you must have at least 100 MB free hard
disk space. If your are printing at 2400 x 1200 dpi, you must have at least
400 MB free hard disk space.