HP Deskpro 1000 Reference Manual page 17

2-2 Computer at a Glance
Chassis includes expansion slots for up to seven expansion
boards:
Three dedicated PCI slots
Three dedicated ISA-bus slots
One "combination" slot for either a PCI or an ISA
expansion board
200-watt continuous power supply, switch-selectable for
115 and 230 VAC operation
Two RS-232C–compatible 9-pin serial connectors
One multimode, 25-pin enhanced parallel connector
Two Universal Serial Bus (USB) Plug and Play connectors,
for use with USB devices such as a mouse, keyboard, most
joysticks, and other future USB peripherals
Five drive bays:
One external 3.5-inch, one-third height diskette drive
installed
One internal 3.5-inch, one-third height drive bay for an
optional drive
One internal 3.5-inch, one-third height hard drive
installed
Two external 5.25-inch half-height bays for optional
drives
One hard drive installed
One 1.44-megabyte, 3.5-inch high-density diskette drive
installed
Compaq Enhanced Keyboard, featuring Microsoft
Windows–specific keys
Mouse
Password security features