Editing IBM System/34 (section)

===Processors===
S/34s had two processors, the Control Storage Processor (CSP), and the Main Storage Processor (MSP). The MSP was the workhorse, based on [[System/3]] architecture; it performed the instructions in the computer programs. The CSP was the governor, a different processor with different [[RISC]]-like instruction set, based on [[System/32]] architecture; it performed system functions in the background. The CSP also executed the optional ''Scientific Macroinstructions'', which were a set of emulated floating point operations used by the System/34 Fortran compiler and optionally in assembly code.<ref>{{cite web|url=http://www.bitsavers.org/pdf/ibm/system34/SA21-9275-0_IBM_System_34_and_System_32_Scientific_Microinstructions_Functions_Reference_Manual_1st_ed_197807.pdf|title=IBM System/34 and IBM System/32 Scientific Macroinstructions Functions Reference Manual|date=July 1978|publisher=IBM|access-date=2021-12-22|website=Bitsavers}}</ref> The clock speed of the CPUs inside a System/34 was fixed at 1&nbsp;MHz for the MSP and 4&nbsp;MHz for the CSP. Special utility programs were able to make direct calls to the CSP to perform certain functions; these are usually system programs like $CNFIG which was used to configure the computer system.
[[File:IBM System34 drives.jpg|left|thumb|Picture of a System/34 showing the diskette magazine drive]]