Compaq AP500 - Professional - 128 MB RAM Reference Manual page 86

Ref.
1 PCI/ISA shared expansion slot. They cannot be used simultaneously/
2 PCI expansion slot (full-length)
3 PCI expansion slot (full-length)
4 PCI expansion slot (full-length)
5 ISA expansion slot (short)
NOTE: PCI=Peripheral Component Interconnect
ISA=Industry Standard Architecture
Table 9-1
PCI/ISA Expansion Slots
Component
Compaq Professional Workstation AP500 Reference Guide
9-3