Chapter 17: Troubleshooting
If your system is not working properly, check the following items.
Boot Block Recovery
The XE–800 SBC supports boot block recovery. This feature allows the user to
reprogram the system BIOS over COM1 using an VTC-20F cable, a null modem
adapter, a floppy disk, and a host computer. This option should only be necessary
if a BIOS has been programmed into the XE–800 SBC and is either corrupted or
non-bootable. For more information covering the boot block recovery process read
the Boot block recovery section in chapter 16 and call Octagon Systems Technical
Support.
Memory conflicts using operating system other than DOS
If you are using an operating system other than DOS the X jumper should be
removed. The X jumper maps the INT17 extended BIOS into the 0xD8000-
0xDFFFF memory. This can cause problems with applications or hardware running
on other operating systems if they attempt to use this memory range. Removing
the X jumper frees this memory for use by other operating systems.
No system LED activity
If there is no LED activity at CR9, check the following:
Make sure all PC/104 or PC/104
Plus
expansion cards are removed from the
XE–800 SBC. This ensures that other cards are not interacting with the XE–
800 SBC.
Remove the jumper from the “S” position at W1[1–2].
Check all power connections to the XE–800 SBC card.
Measure the supply voltage at the J8 power connector and verify that the
voltage at the XE–800 SBC card is +5V (+/–0.25V).
Make sure your power module pr5V (+/–0.25V) and at least 2.5A of
current.
No CRT or flat panel video
If the LEDs appear to be functioning properly, but there is no video activity, check
the following:
Make sure all PC/104 or PC/104
Plus
expansion cards are removed from the
XE–800 SBC. This ensures that other cards are not interacting with the XE–
800 SBC.
Remove the jumper from the “S” position at W1[1–2].
If using a CRT monitor, check the cable and connections going from the J3
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