HP Deskjet 3420 Color Inkjet Printer - Manual (Page 67)

minimum system requirements
Your computer must meet the following minimum requirements:
Microsoft Windows XP
Minimum Processor Speed: Pentium 233 MHz
Required RAM: 64 MB
Required Free Hard Disk Space: 40 MB*
Microsoft Windows 2000
Minimum Processor Speed: Pentium 133 MHz
Required RAM: 64 MB
Required Free Hard Disk Space: 40 MB*
Microsoft Windows 98 or Me
Minimum Processor Speed: Pentium 166 MHz
Required RAM: 32 MB
Required Free Hard Disk Space: 40 MB*
* If you are printing photographs or are printing at 2400 x 1200 dpi, you must have a
large amount of free hard disk space.
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