When MS-DOS is started, IO.sys is loaded first.
Chapter 11: MS-DOS Internals
Pg: 284
Book: Operating Systems
The program segment prefix (PSP) in MSDOS is the first 256 bytes of memory allocated by the command interpreter to load and run a program. The program itself is loaded next. The first 128 bytes of the PSP contains various structures and pointers. The second 128 bytes of the PSP initially contain the command line, and is then available as the default disk buffer for subsequent I/O.
It's one of the first Windows operating systems.
PCDOS an IBM branded version of MSDOS, licensed to IBM. Eventually IBM abandoned it and MicroSoft took over direct marketing of MSDOS.
There is no any software for MSDOS shell as MSDOS is itself a system software.
Yes. Along with MSDOS.sys, they are the two hidden system files that are loaded and executed when you boot your computer. In newer operating systems, IO.sys and MSDOS .sys are combined into one hidden file.
In MS-DOS, the file that contains internal commands loaded during the booting process is COMMAND.COM. This file serves as the command line interpreter and contains the basic commands necessary for operating the system. When MS-DOS starts, COMMAND.COM is loaded into memory, allowing users to execute commands and run programs.
Start=>Run=>msdos
Microsoft Disc Operating System
No Programs can function (run) without first being loaded into the computer's Memory. Once loaded, Instructions can be addressed and performed. The same is true for Data. It is first read from its source and them loaded into Memory.
Only if it has a MSDOS-emulator -- not likely.
MSDOS was officially released in 1981 by Microsoft.
Operating system