Display mode switching in MS-DOS Which MODE command switches from a color display to the monochrome (black-and-white) text display?

Introduction / Context:
Legacy DOS systems supported multiple display adapters and text modes. The MODE command configures console characteristics, including redirecting output to monochrome adapters or switching among text modes. Knowing the exact syntax avoids confusing display settings and illegible output.

Given Data / Assumptions:

• System has a functioning display adapter capable of monochrome mode.
• We are operating at the DOS command prompt.
• We need a command that explicitly selects monochrome behavior for text output.

Concept / Approach:

MODE MONO directs output to the monochrome display. Other MODE options (such as CO40, CO80) select columns and color settings for color adapters but do not switch to monochrome output devices. Syntax must match DOS expectations exactly.

Step-by-Step Solution:

Verification / Alternative check:

Run commands that produce text output (for example, DIR) and observe the adapter used. Switching back and forth with MODE commands demonstrates the effect in real time.

Why Other Options Are Wrong:

a and b: Not valid DOS syntax; MODE does not accept “BLACK” or “B/W”.

d: MODE CO40 selects 40-column color text mode, not monochrome.

e: Not applicable because MODE MONO is correct.

Common Pitfalls:

Mis-typing parameters; assuming that MODE commands will work identically across all DOS variants or modern shells—hardware and drivers must support the mode.

Final Answer:

MODE MONO