J. J. Matthews, University of Exeter, Exeter, United
CIG-8 is an overlay to FOCAL 1969 for interactive graphics
on a non-storage scope. A reasonable refresh rate is obtained
through a display file assembled by an integer storage func-
tion. Selective modification of the file by FOCAL programs
gives interaction. The HSR routine is sacrificed but the rest
of FOCAL plus a shortened FCOM, FIN and the F.F.T.
function are added.
8K PDP-8 with VC8/I or equivalent;
All of both fields