Chapter 41 The IBM 7094 I,II 519
Fig. 2. IBM 7094 data-processing system configuration. (Courtesy of International Business Machines Corporation.)
Central processing unit, Pc
The Pc has three physical parts: the T('7151-2 Console), the D('7110 Instruction Processing Unit), and the K('7109 Arithmetic Sequence Unit). In terms of gross PMS parameters the 7094 I can be described similar to footnote three of Fig. 1 as
The Pc will be discussed in two parts: the Register-transfer level implementation and the Instruction-set Processor. These are partially redundant, but they offer another opportunity to compare the two types of descriptions. The Pc hardware will be described by first giving the registers and the interregister transfer paths. Then the process by which instructions are interpreted will be described. (Interpretation occurs in a distinct set of memory cycles, called instruction/I, execute/E, logic/L, and buffer/B, which are sometimes mentioned in describing registers and will be fully discussed later.)