And they said it couldn't be done. Handspring today posted Updater 1.0.0, which fixes several issues:
Calculator Launch Fix - This fix prevents unexpected launches of the Calculator when touching the Visor screen close to the Calculator launcher icon.
Serial Modem Fix- This fix corrects an issue where a Visor may have difficulty performing a HotSync operation using a serial cradle when a modem Springboard module is installed.
8MB DRAM Memory Fix (if necessary)This fix corrects an issue where a limited number of Visor Deluxe handhelds manufactured between January and May, 2000 can experience a "fatal error" as a result of a faulty DRAM memory chip. This fix is only installed on affected Visor Deluxe handhelds; the version info window will now display "Palm OS Software v3.1H3M". Depending on individual usage patterns there may be an impact on battery life.
The patch is for any Visor model with Palm OS 3.1H2 or earlier. After the update, looking at the Info screen will show that you have Palm OS v3.1H3 or v3.1H3M if the 8MB DRAM fix was needed. Make sure you read the FAQ on the Updater page, as it answers a lot of good questions about the patch. Thanks to guido79 for the link.