System Architecture
| State | Mode | VM | Interrupts | |
|---|---|---|---|---|
| User programs | problem | user | on | on |
| Command Language Subsystems (CLSs), Device Support Routines (DSRs), System Subroutines |
system | |||
| Job programs (MTS, PDP, DMGR, RM or HASP, ...) | on or off | |||
| Supervisor (UMMPS) | supervisor | n/a | off | off |
| S/360-67 or S/370 hardware | ||||
UMMPS, the supervisor, has complete control of the hardware and manages a collection of job programs. One of the job programs is MTS, the job program with which most users interact. MTS operates as a collection of command language subsystems (CLSs). One of the CLSs allows for the execution of user programs. MTS provides a collection of system subroutines that are available to CLSs, user programs, and MTS itself. Among other things these system subroutines provide standard access to Device Support Routines (DSRs), the components that perform device dependent input/output.
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