HP Deskjet 3820 Color Inkjet Printer - Manual (Page 82)

print technology
Drop-on-demand thermal inkjet printing
software compatibility
MS Windows compatible (95, 98, Me, 2000, NT 4.0, and XP)
duty cycle
1000 pages per month
memory
2 MB built-in RAM
processor
96 MHz processor
buttons and lights
Cancel button
Print Cartridge Status light
Resume button and light
Power button and light
i/o interface
Centronics Parallel, IEEE 1284- Compliant with 1284-B receptacle
Universal Serial Bus (USB) 2.0 compatible
dimensions
445 mm wide x 197 mm high x 256 mm deep