And of course the software can only be upgraded by manually entering a 1024 digit hex cryprographic hash generated by the manufacturer upon supplying the serial number, date of purchase, and evidence of a support contract. The software upgrade should take at least 20 minutes to upload at 9600 bps from an RS-232 port from a PC running Windows 3.11 (newer versions of Windows not compatible). And, if the cryptographic hash is wrong, you won't know until the software has been uploaded, ensuring that mis-entering the 1024 hex digit key will waste at least 20 minutes of your time.
