HP 68302 User Manual page 492

If you are using COM3 or COM4 port to update your firmware, you need to
edit the <installation_path>\TABLES\64700TAB file. Either add another line
or modify one of the existing lines. For example:
EMUL_COM3 my_emul COM3 OFF 9600 NONE ON 1 8
EMUL_COM4 unknown COM4 OFF 9600 NONE ON 1 8
Ensure the Interrupt Request Line for the selected COMx port is set
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to its default value. To check the default value:
Choose Control Panel in the Main window.
1
Choose Ports in the Control Panel window.
2
Choose the COMx port you are using and click Settings....
3
Click Advanced... in the Settings for COMx dialog box.
4
Select the default value for the Interrupt Request Line in the Advanced
5
Settings for COMx dialog box. The default settings are:
COM1 and COM3 = IRQ 4
COM2 and COM4 = IRQ 3
Exit Windows and reboot your PC to activate the changes made to
8
the CONFIG.SYS and AUTOEXEC.BAT files (CTRL+ALT+DEL).
Installation of the firmware update utility is now complete.
Chapter 15: Installing/Updating HP 64700 Firmware
Step 2. Install the firmware update utility
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