Specifications

EPC-21/22 Hardware Reference

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Symptoms Possible cause(s) Solution

Serial port(s) do not work. Port is disabled in the

Setup screen.

Interrupt conflicts.

Port hardware failure.

Press CTRL+ALT+ESC to enter the

Setup screen. Use cursor arrows to

move to the appropriate field and

toggle the entry to enable the port.

Another module may be using the

same interrupts as COM1 and/or

COM2. Verify that no other card in

system is using IRQ3 or IRQ4.

Replace the EPC.

Common Error Messages

This section contains a summary of error and warning messages alphabetized by

message text. These are messages generated by the BIOS and MS-DOS that may be

related to your hardware configuration.

BAD OR MISSING COMMAND INTERPRETER DOS

Problem: The DOS operating system cannot find the Command line interpreter.

Solution(s): Either COMMAND.COM is not present at the specified (or default)

directory level of the boot disk or the "SHELL=" statement in your

CONFIG.SYS lists the file incorrectly (wrong directory or

misspelled).

CMOS CHECKSUM INVALID BIOS

Problem: Something in the CMOS RAM is incorrect.

Solution(s): Run the BIOS setup program to determine what is wrong, and correct

it. If the error occurs repeatedly, the EPC's battery has failed.