AP-64e EPROM machine code address/write error

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AP-64e EPROM machine code address/write error

I'm trying to re-program an F8 EPROM (Apple II+ clone motherboard) in order to replace the "APPLE ][" title with something else but am having problems writing (burning) the EPROM with my AP-64e EPROM programmer card and wonder if anyone can help?

An estimated guess is that I've probably misunderstood something about addresses in machine code. I've done it before, but after several decades some details in my notes are probably missing.

 

I've actually written a "DIY how-to" guide on my blog page, but I'm posting here as I fear not many people in the forum check for blog updates. My "How to: DIY changing the APPLE ][ title" blog article with my plea for help is located here.