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Some of the processors I've worked with over the past thirty years...
The 8742 and 8748
Intel 8742 (One-Time Prog, & Re-Programmable).
Intel D8748H & NEC D8748HD Re-Programmable types.
NEC D8748 white ceramic. And look through the window.
I was working on miniature radar systems using these devices in the late 1980's / early 1990's
And later, on some telephone systems which used one of them on each card, 12 in one system!
These were used in some PMR radio control heads too. Although I didn't hack them, much.
My Intel IPDS system had the programming pod for these, so software changes were easy.
just erase them in a normal eprom eraser, and re-program in the IPDS. The IPDS has since died
but these continue to be found. I love these uv erasable devices for development work.
All images and text copyright (c) 2003-2009 T.R.Bluck. OES Engineers / qq22.net