Turns out it's both START and RUN. E4 is RUN only.
Interesting. You're probably right; I would have to check my logs on my '95 while running experiments to see if that is indeed the case. I mean, I assume it is since you already got it working thanks to kur4o's hack, but yeah. I could confirm I suppose.
Definitely seems like a security-related thing; again this handshake was not present in the 90-91 and was only added in 92 and later. And since I only have the original 1990 documentation, well, there's that.
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