Intergraph TD-x20 System Reference Manual page 28

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To remove the deskside riser card:
1. Remove the PCI access panel as described previously in Chapter 2, "Maintaining System
Devices."
2. Remove the PCI boards connected to the riser card as described previously in Chapter 2,
"Maintaining System Devices."
3. If ISA option boards are installed, disconnect the SCSI cable and power cables from the
top of the riser card, and remove the ISA I/O lock bracket. Refer to the following figure.
Power Cable
Connector
SCSI Cable ISA I/O Lock
Connector Bracket
Riser Card