A retrographics board was available for the 950; not
sure if that's
what the 955 also used: [...]
I am inclined to doubt it. I have a 955 and a 950, and I've pulled the
955 apart enough to replace the ROMs (I gave mine a Latin-1 font
instead of the not-quite-Latin-1 it came with, and built a small video
game to run out of the user ROM socket - a friend started asking me
when to expect a NetBSD/tvi955 port :-).
But, in particular, the 955 has a great deal less physical space
available for addons than the 950 does, so it strikes me as unlikely
that an addon board exists that works with both.
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