Chapter 1 Hardware Installation
15
Step 5 Set Jumpers
Jumpers
The Titan III motherboard has several jumpers that must be set properly. The
non-CPU jumpers are:
Connector
J21 DMA for ECP
J16 DACK for ECP
J14 IRQ for Parallel Port
J17 Second CPU Type
J19 APIC Enable
J23 PS/2 Mouse IRQ
J28 Password clear
J4 and J30 IDE Bus Master
Select Parallel Port IRQ J14 is a 3-pin berg that selects the parallel port IRQ. If IRQ5 is
selected, you must change the IRQ5 option in PCI/PnP Setup to ISA/EISA.
Setting
Description
Short Pins 2-3
Select IRQ 5 for the parallel port.
Short Pins 1-2
Select IRQ 7 for the parallel port (Factory Setting).
Select Parallel Port DMA J16 is a 3-pin berg that selects the ECP (Extended Capabilities
Port) DMA channel.
DMA Channel
J16
J21
None (Factory Setting)
OPEN
OPEN
DRQ1
Short Pins 1-2
Short Pins 1-2
DRQ3
Short Pins 2-3
Short Pins 2-3
J17 Select CPU J17 is a 3-pin berg that enables an Intel P54C/CM CPU pair. Pins 2-3 must
always be shorted.
J19 APIC
J19 is a 3-pin berg that enables the local Advanced Programmable Interrupt
Controller. Enable the APIC if two CPUs are installed. The settings are:
Action
Set J19
Enable the APIC if 2 CPUs are installed.
Short Pins 1-2
Disable the APIC if only one CPU is installed.
Short Pins 2-3.
Cont’d