Elektra CPU User Manual V1.00
Page 32
The settings of COM1 and COM2 may be changed in the system BIOS. Select the Advanced
menu, then I/O Device Configuration. The base address and interrupt level may be modified on
this page.
The addresses of COM3 and COM4 are fixed. The interrupt (IRQ) settings for COM3 and COM4
are selected with J10. COM3 may use IRQ4 or IRQ9. COM4 may use IRQ3 or IRQ15. See page
19 for serial port IRQ jumper settings. Note that once these jumper selections are made, the user
must update the Serial Port IRQ settings to match these selections – the IRQ settings are NOT
autodetected in the same manner that the address settings are.
8.3 PS/2 Ports
ELEKTRA supports 2 PS/2 ports: one dedicated for keyboard and the other dedicated for mouse
function. The two PS/2 ports are accessible via a cable assembly (DSC#
C-PRZ-01
) attached to
J3. Support for these ports is independent of, and in addition to, mouse and keyboard support via
the USB ports.
8.4 USB Ports
ELEKTRA contains 2 USB Ports (referenced as “USB0” and “USB1”). All USB ports are
accessible via cable assemblies attached to J5 (“USB0” and “USB1”).
USB support is intended primarily for the following devices (although any USB1.1-standard device
should function without issue):
•
Keyboards
•
Mice
•
USB Floppy Drive (NOTE : this is required for “Crisis Recovery” of boot ROM)
•
USB
flash
disks
The BIOS fully supports the USB keyboard during BIOS initialization screens, as well as legacy
emulation for DOS-based applications.
The USB ports can be used for keyboards and mice at the same time that the PS/2 keyboard and
mouse are plugged in – multiple devices of the same type are supported, although this can get
rather confusing.
