Answers, and more from 1994 manual
+ = hit
- = stand
/ = split
d = double if possible,otherwise stand.
D = double if possible, otherwise hit.
x = surrender if possible, otherwise stand
X = surrender if possible, otherwise hit
e = hit 3 or more cards, otherwise double if possible, otherwise stand
E = hit 3 or more cards, otherwise double if possible, otherwise hit
f = hit 4 or more cards, otherwise double if possible, otherwise stand
F = hit 4 or more cards, otherwise double if possible, otherwise hit
3 = hit hands of 3 or more cards, or else stand
4 = hit hands of 4 or more cards, or else stand
5 = hit hands of 5 or more cards, or else stand
6 = hit hands of 6 or more cards, or else stand
# = hit 3 or more cards, or else surrender if possible, or else stand
$ = hit 4 or more cards, or else surrender if poss., or else stand
% = hit 5 or more cards, or else surrender if poss., or else stand
^ = hit 6 or more cards, or else surrender if poss., or else stand.
Hope this helps.
AB