24 Nov
2006
24 Nov
'06
11:02 p.m.
On Fri, 24 Nov 2006, Richard wrote:
Would it be possible to do the same sort of trick with the LSI-11?
I've got an 11/03 and it would be nice to have floating-point :-).
There were a couple of floating point options for 11/03. I haven't
actually seen either.
The first, FIS-11, was a ROM that goes into the empty socket.
The second, FPP-11, was an add-on board that connected to the 11/03 via
the empty socket.
As I understand it, the empty socket could be used for either floating
point or the commercial instruction set. Since there's only one empty
socket, you can't have both floating point and the CIS.
There's also a writable control store, WCS-11, that plugs into that
slot.
--
roger ivie
rivie at ridgenet.net