52Chapter B - GDT User's Manualthe SCSI cable may be used by SCSI devices which do not supply DC power to their ownSCSI termination circuitry (e.g. external SCSI terminator packs.).Step 7When installing internal SCSI devices, make sure that the slots of the SCSI devices have asufficient air flow, and that the power consumption of all SCSI devices does not exceed thecapacity of the computer's power supply. An overloaded DC power supply has a poor DCvoltage quality (noise, ripple) and causes problems for all connected consuming devices.Step 8If you wish, you can connect the HDD-front-LEDs of the PCI computer system to the LEDconnectors of the GDT controller (for the pin assignment of these connectors, see the ap-pendix).Step 9Before the PCI computer system is switched on, you should check the following points overagain:99 Is the SIMM plugged firmly into the SIMM socket ?99 GDT plugged firmly into one of the PCI bus-master slots ?99 SCSI-IDs set correctly ?(with no other device currently set to ID 7 ?)99 SCSI-bus terminators plugged/set correctly ?(with currently terminated GDT SCSI channels ?)99 SCSI flat ribbon cables connected correctly ?99 All SCSI devices installed properly and connected to the power supply ofthe PCI computer system ?Step 10After having checked all the points of "Step 9", re-connect the PCI computer system to thepower supply. Do not close the computer case yet. Before the PCI computer system can beswitched on again, an MS-DOS boot disk containing the GDTSETUP program (including alloverlay files) and the driver GDTX000.EXE is needed. GDTSETUP and the driver can befound on the GDT "System Disk - DOS".B.6 GDT controller Function CheckBefore we put the GDT controller into operation for the first time, we would like to spend afew words on the PCI 2.x compatibility requirements a PCI computer system (especially themotherboard) should meet.B.6.1 PCI 2.x Compatibility RequirementsA pre-condition for a flawless installation of PCI bus-master expansion cards (the GDTcontrollers belong to this group of expansion cards) in a PCI motherboard is a 100% PCI2.x compatible System-BIOS.
