OS-X
Encyclopedia
OS-X is a priority-based pre-emptive
multitasking
real-time
embedded operating system
designed for embedded Zilog Z80
systems with bank-switched memory. One of the main features of the OS-X is that it has the ability to run processes in separate address spaces (memory banks) and that allows a 8-bit Z80 to run an almost unlimited number of processes and host many software and data areas. The only limitation is that a part of the 64 KB memory space the CPU can address is reserved for common areas and that puts an upper limit on the size of each process. Kernel extensions exist for POSIX
compliant file and thread services. It also has an optional file system
using CMOS RAM, FLASH EPROM, floppy or remote storage media over network.
OS-X is distributed as a collection of precompiled object files and the corresponding interface source files.
OS-X is written in a combination of TML2 and Z80 machine code
.
Preemption (computing)
In computing, preemption is the act of temporarily interrupting a task being carried out by a computer system, without requiring its cooperation, and with the intention of resuming the task at a later time. Such a change is known as a context switch...
multitasking
Computer multitasking
In computing, multitasking is a method where multiple tasks, also known as processes, share common processing resources such as a CPU. In the case of a computer with a single CPU, only one task is said to be running at any point in time, meaning that the CPU is actively executing instructions for...
real-time
Real-time operating system
A real-time operating system is an operating system intended to serve real-time application requests.A key characteristic of a RTOS is the level of its consistency concerning the amount of time it takes to accept and complete an application's task; the variability is jitter...
embedded operating system
Embedded operating system
An embedded operating system is an operating system for embedded computer systems. These operating systems are designed to be compact, efficient, and reliable, forsaking many functions that non-embedded computer operating systems provide, and which may not be used by the specialized applications...
designed for embedded Zilog Z80
Zilog Z80
The Zilog Z80 is an 8-bit microprocessor designed by Zilog and sold from July 1976 onwards. It was widely used both in desktop and embedded computer designs as well as for military purposes...
systems with bank-switched memory. One of the main features of the OS-X is that it has the ability to run processes in separate address spaces (memory banks) and that allows a 8-bit Z80 to run an almost unlimited number of processes and host many software and data areas. The only limitation is that a part of the 64 KB memory space the CPU can address is reserved for common areas and that puts an upper limit on the size of each process. Kernel extensions exist for POSIX
POSIX
POSIX , an acronym for "Portable Operating System Interface", is a family of standards specified by the IEEE for maintaining compatibility between operating systems...
compliant file and thread services. It also has an optional file system
File system
A file system is a means to organize data expected to be retained after a program terminates by providing procedures to store, retrieve and update data, as well as manage the available space on the device which contain it. A file system organizes data in an efficient manner and is tuned to the...
using CMOS RAM, FLASH EPROM, floppy or remote storage media over network.
OS-X is distributed as a collection of precompiled object files and the corresponding interface source files.
OS-X is written in a combination of TML2 and Z80 machine code
Machine code
Machine code or machine language is a system of impartible instructions executed directly by a computer's central processing unit. Each instruction performs a very specific task, typically either an operation on a unit of data Machine code or machine language is a system of impartible instructions...
.