  We study 2d chiral theories arising from 4d N=4 Super-Yang Mills (SYM) with
varying coupling tau. The 2d theory is obtained by dimensional reduction of N=4
SYM on a complex curve with a partial topological twist that accounts for the
non-constant tau. The resulting 2d theories can preserve (0,n) with n = 2, 4,
6, 8 chiral supersymmetry, and have a natural realization in terms of strings
from wrapped D3-branes in F-theory. We determine the twisted dimensional
reduction, as well as the spectrum and anomaly polynomials of the resulting
strings in various dimensions. We complement this by considering the dual
M-theory configurations, which can either be realized in terms of M5-branes
wrapped on complex surfaces, or M2-branes on curves that result in 1d
supersymmetric quantum mechanics.
