OK, primary goal is to kill viruses, so I will let go of secondary purpose of clearing RAM on >1.3. Thanks again Ross. You know so much OS stuff!
I mean I could feed the Amiga users who dare boot a floppy on a 3.1 machine to the sharks WRT viruses. They might have valid resident vectors like Blizzard accelerator stuff. Then again those users can opt to not hardreset because they know. It would be nice for an antivirus boot block to actually work on >1.3.