> I was looking here: > > http://bitsavers.informatik.uni-stuttgart.de/pdf/ibm/360/ > fe/2020/Z33-1021-0_2020_Processing_Unit_FETOM_May68.pdf > > (pdf) pages 45, 46 describe the ALU > > I note that the cover page says: "(Machines with serial no. 50,000 and above)."
Perhaps the ALU is only present on late model machines? -- Charles
