From: Lars Brinkhoff
I have seen conflicting information in sources dating
from the 70s when
the TV-11 and XGP-11 were very much in use.
For several reasons, I believe the TV-11 was the first machine attached
to the 10-11 interface, and the XGP-11 came second. This would lend
some weak support for the theory that the first would be a 11/20 and the
second a 11/10.
Yeah, but Clem's note reinforces my vague memory that the XGP-11 was an
I wish we had a picture of the Knight TV system (the system, not a
terminal). It's a extremely significant system - I believe it my have been the
first bit-mapped computer display system ever; and thus the prototype, in some
sense, for the display of every single personal compupter (including phones)
now extant - and so there _ought_ to be a photo of it. But looking online for
a while, I can turn up almost nothing about it! (I guess we should do a page
about it on the CHWiki...)
(Repeat my prior grump about how the AI Lab did all sorts of ground-breaking
stuff, because it was just 'tools', and not their main research focus,
hard to find out about a lot of it, e.g. the inter-ITS network file
But if you can find an image, even a low-res picture of that end of the AI Lab
machine room, we can tell what model the TV-11 is - early 11's had inteagrated
front panels, which are different for every model:
so you don't even need to be able to read anything to tell a /20 from a /10.
It was in a dual (I think - maybe triple, it's been a looooooong time :-)
rack which IIRC was along the side wall (i.e. the short building side) next to
the AI KA10 (which was sort of along the long wall, up in the corner).
I don't know if the XGP-11 code is still extant (my copy of the ITS filesystem
is offline right at the moment), but even if we look at the code, I'm not sure
we could tell; there are some _very minor_ programming differences between the
/20 and /10 (e.g. V bit on SWAB) - see the table at thd end of the PDP-11
Architecture Handbook - but I'd be aurprised if the code used any.
Surely there has to be _some_ picture of the machine room which shows it, even
if in the background.
I did bring it up with TK at some point.
Try RG, too.