DOS is a program, so it's software. Hardware is the physical machine parts.
It is a computer operating system, therefore it is a software. No.
MS-DOS was initially released in 1981 for the Intel 8086 and 8088 based processors. There are no software requirements for MS-DOS as it is a stand-alone operating system. MS-DOS is compatible with x86 systems.
What you asked is basically what system software is. So any Operating System will answer your question. Examples are DOS, Easy DOS, Windows (all versions) Linux, MAC, etc.
A VDU is hardware.
That'd be software installed directly onto a piece of hardware which is the operating code for that piece of hardware. For example, a hardware RAID controller might have firmware on it that controls its operation.
DOS
A scanner is both hardware and software, the device itself is hardware (all devices are hardware) but the driver(a program) that runs it is software.
hardware
A microphone is hardware. Software is what programs and games are called.
both a hardware and software
Motherboards are hardware components, not software.
Have to be hardware. How could you write software if there were no hardware to write it on?