What is the primary architectural function of the 'SCAS' (Scan String) instruction?
Ch 07: Video Memory & Screen Display
Covers direct text manipulation on 80x25 character screens, calculating screen offsets ((Row * 80 + Col) * 2), attribute byte structure (foreground, background, blink bit), and converting binary values to ASCII strings.
264 Questions264 MCQs0 Short Questions0 Long Questions
SEMESTER PASS
CS401 - Computer Architecture and Assembly Language Programming Examination Practice
Timed practice exam simulation for CS401 - Computer Architecture and Assembly Language Programming.
Showing 211 – 220 of 264 Questions
Page 22 of 27
Which mathematical operation is executed internally during the execution of the 'SCAS' (Scan String) instruction?
If a string memory operation processes string elements in reverse direction from higher memory addresses toward lower memory addresses, what is the state of the Direction Flag (DF)?
Which pair of registers is used to hold memory offset addresses in x86 string instructions?
Which assembly language instruction is used to clear the Direction Flag (DF = 0) for auto-incrementing string operations?
During the execution of the STOSW (Store String Word) instruction, when the Direction Flag is cleared (DF = 0), how is the Destination Index (DI) register modified?
In x86 assembly language architecture, which class of instructions explicitly permits direct memory-to-memory data transfers?
After the execution of a MOVS (Move String) instruction, which index registers are automatically updated (incremented or decremented)?
When executing the STOSB (Store String Byte) instruction with the Direction Flag cleared (DF = 0), how is the Destination Index (DI) register modified?
Which assembly instruction prefix is used to repeatedly execute a string instruction for the count specified in register CX?