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|Telecommunications controller (If used in a telecommunications environment)||[[IBM 2701]] Communication Controller
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==Microprogramming==
[[Image:IBM 360 20 TROS.jpg|thumb|300px|Transformer matrix ROM (TROS), from the IBM System 360/40]]
Like most System/360 models the Model 40 was [[Microcode|Microprogrammed]]. The microcode was stored in [[Transformer Read Only Storage]] (TROS), organized 12 up to 8192 words of 56 bits each. Standard microcode consisted of up to 4096 words. The additional 4096 words was used for the 1401 or 1410 compatibility feature.<ref name="FE">{{cite book |last1=IBM Corporation |title=IBM Field Engineering Manual of Instruction: System/360 model 40 Functional Units |date=1970 |pages=52–73 |url=http://bitsavers.org/pdf/ibm/360/fe/2040/SY22-2843-1_Model_40_Functional_Units_Mar70.pdf}}</ref>
==IBM 1400 series emulation==
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