Question

A register where to store the length of the string when printing with attribute.

Make a PROGRAM SEGMENT that will set a semi block cursor (A:> 1 )

A register where to store the address of the string when printing string with attribute

Give a PROGRAM SEGMENT that will set the cursor at row 12, column 8.

A register where to store the end of scan line when setting cursor size

A register where to store the requested service call

Give a PROGRAM SEGMENT that sets the video mode to a 80 x 25 color text.

A register where to set the attribute

Answer 1

The question involves creating assembly language program segments to set cursor appearance, position, and video mode using BIOS interrupt services in an x86 architecture. It requires an understanding of the correct interrupts, the function codes, and the parameter registers for each operation.

Step-by-step explanation:

The question pertains to writing assembly language program segments for specific operations on a typical x86 architecture usually related to video display and cursor management in a text mode environment. A common environment where this occurs is the BIOS (Basic Input Output System) on a PC, which provides a set of routines that can be called by programs to perform low-level operations.

For example, to set a semi block cursor, a program segment could look like the following:

MOV AH, 1 ; Function code to set cursor size
MOV CH, 0Ah ; Start scan line (top of the cursor)
MOV CL, 0Fh ; End scan line (bottom of the cursor)
INT 10h ; BIOS video interrupt

To set the cursor position to row 12, column 8, the segment would be:

MOV AH, 2 ; Function code to set cursor position
MOV BH, 0 ; Page number
MOV DH, 12 ; Row
MOV DL, 8 ; Column
INT 10h ; BIOS video interrupt

To set the video mode to 80 x 25 color text, we use another interrupt:

MOV AH, 0 ; Function code to set video mode
MOV AL, 3 ; Mode number for 80x25 color text
INT 10h ; BIOS video interrupt

The BIOS interrupt 10h is used in all segments as it is dedicated to video services.