If The "Progflash" Routine Won't Work - HP 64780A Installation/Service/Terminal Interface Manual

Chapter 5: Installing/Updating Emulator Firmware
Updating the firmware using a PC

If the "progflash" routine won't work

For PROGFLAS to work, the selected communications port must have its Interrupt
Request Line set to the default value. To set the value of the Interrupt Request
Line:
108
1 Choose Control Panel in the Main window.
2 Choose Ports in the Control Panel window.
3 Choose the COMx port you are using, and click Settings...
4 Click Advanced... in the Settings for COMx dialog box.
5 Select the default value for the Interrupt Request Line in the Advanced
Settings for COMx dialog box. The default settings are:
COM1 and COM3
COM2 and COM4
IRQ4
IRQ3