Step 59: JIS Japanese Industrial Standard
Many people and companies outside of the Asian market have no idea what JIS is/are. With the similarity in appearance to the Frearson and the Phillips the screws are often damaged in removing and installing with the wrong tools. The JIS driver can be used on Phillips quite easily but not reciprocally. Drivers are not easily available in North America; try your local Radio Controlled Airplane hobby shop. Most RC Helicopters use JIS screws to mount the propellers.
Fellow instructable members gentry & Joe Katz: talk about the early Japanese motorbikes, as in the 1950's and 60's, the first Japanese motorbikes that came into the US were so frustrating to work on. The case screws looked like Phillips but all a Phillips driver did was strip out the recess. Both talk about needing to use vice-grips and even impact drivers - 'cause an impact would get 'em out even if the bit didn't fit well.
Eiko ISO Screw
Fellow instructable contributor Gecik says: In the 1970's and early 80's -- back when "movies" were strips of photographic film I repaired those movie projectors. Eiki was a Japanese company with very good, easily maintained 16mm projectors used extensively at colleges and universities (at least in the USA). Eiki projectors used what they called "ISO screws" and which sound very much like your JIS description. The ISO screws were difficult to remove with a Philips screwdriver, but were a breeze with the ISO screwdrivers supplied by Eiki. These screwdrivers also worked well with Philips. I had to purchase ISO screwdrivers through Eiki; a company in Kobe, Japan manufactured the tools. After the big earthquake in Kobe, the manufacturing company did not rebuild. The present-day Eiki has no historical knowledge of the ISO screwdrivers or that they had even used these screws. The "ISO screw" that I remember -- and still see in VCRs (soon-to-be-extinct also) and other Japanese manufactured goods has what I would describe as a "dimple" or a depression/dot between two sides of the "X."
I'm almost sure what Gecik refers to, as Eiki ISO screws were actually JIS-Type screws with ISO metric threads. Two ways of saying the same thing. Similar to if I'd call them Yuyama ISO screws.
You see my own JIS experience is with a medication-dispensing machine made by Yuyama of Osaka Japan. During the service training on these units along came JIS as they called it. Each screw has an identifying "dimple" on the head which I take to understand indicates that the cross-point head is not a Phillips. The screws are also all metric.