Compaq 247320-003 - Deskpro 4000 - 5166 Model 2500/CDS Reference Manual page 137

Your computer contains expansion slots, as follows:
ISA (Industry Standard Architecture) expansion slots
PCI (Peripheral Component Interconnect) expansion slots
One PCI/ISA shared expansion slot
The graphics controller resides in either a PCI slot in the
expansion board cage, or in the AGP slot on the system
board.