A read-only memory device for firmware would be helpful. Not flash, not something erasable, but hard ROM, in a socketed device. All the firmware would go in that ROM, and you could take it out if necessary and compare it with other ROMs. There are simple hard-wired ROM comparison devices.<p>This is the approach mandated by Nevada Gaming Commission slot machine regulations.[1]<p>[1] <a href="http:&#x2F;&#x2F;gaming.nv.gov&#x2F;modules&#x2F;showdocument.aspx?documentid=3309" rel="nofollow">http:&#x2F;&#x2F;gaming.nv.gov&#x2F;modules&#x2F;showdocument.aspx?documentid=33...</a>