Peter Lemkin, NINDS PRB, National Institute of Health,

Bethesda, Maryland

This program is a patch for FOCAL W (8/68) which lets users

with LINC-8's use the LINC point display in FOCAL programs.

The user sets up and intensifies the X and Y coordinates

the same way as for the PDP-8 display except for the following

differences:

A. X and Y coordinates are reversed so that for example:

SET H = FDXS(X)+FDIS(Y)

should be rewritten as

SET H = FDXS(Y)+FDIS(X)

B. The range of X is from 0 to 512₁₀

and the range of Y is from -256₁₀ to +256₁₀

The patch clobbers the ARCTAN FOCAL function. If the

ARCTAN function is needed, it can be computed from the

FEXP function.