Is involved in the catabolism of alpha-glycosides accumulated via a phosphoenolpyruvate-dependent phosphotransferase system (PEP-PTS). Hydrolyzes a wide variety of 6-phospho-alpha-D-glucosides including maltose-6'-phosphate, isomaltose-6'-phosphate, maltitol-6-phosphate, trehalose-6-phosphate and the 6'-phosphorylated derivatives of the five linkage-isomeric alpha-D-glucosyl-D-fructoses: trehalulose-6'-phosphate, turanose-6'-phosphate, maltulose-6'-phosphate, leucrose-6'-phosphate, and palatinose-6'-phosphate. However, sucrose-6-phosphate is not a substrate for this enzyme. alpha-maltose 6'-phosphate + H2O = D-glucose + D-glucose 6-phosphate Divalent metal cation. Requires Mn(2+), Co(2+) or Ni(2+). Glycan biosynthesis; sucrose metabolism. Homodimer. By the five linkage-isomeric alpha-D-glucosyl-D-fructoses, or by maltose or maltitol. Belongs to the glycosyl hydrolase 4 family.