Chapter 20: Troubleshooting
If your system is not working properly, check the following items.
Boot Block Recovery
The PC–600 supports boot block recovery. This feature allows the user to
reprogram the system BIOS over COM 1 using a 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 PC–600 and is
either corrupted or non-bootable. For more information covering the boot
block recovery process read the
Boot block recovery
section in chapter 18
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 CR1 or CR3, check the following:
Make sure all PC/104 expansion cards are removed from the PC–600.
This ensures that other cards are not interacting with the PC–600.
Remove the jumper from the “S” position at W12[1–2].
Check all power connections to the PC–600 card.
Measure the supply voltage at the J9 power connector and verify that
the voltage at the PC–600 card is +5V (+/–0.25V).
Make sure your power module pr5V (+/–0.25V) and at least 2.5A
of current.
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