In the store string primitive instruction `STOS`, which register serves as the implicit source data register?
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.
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CS401 - Computer Architecture and Assembly Language Programming Examination Practice
Timed practice exam simulation for CS401 - Computer Architecture and Assembly Language Programming.
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When executing a string primitive instruction with the `REP` repeat prefix, how does `REP` modify the loop counter register `CX` during each iteration?
What is the primary function of the string primitive instruction `SCAS` (Scan String)?
After the execution of a string primitive instruction with the `REP` prefix, `CX` is decremented. Which of the following status flags in the FLAGS register are affected by the `REP` repetition mechanism?
In x86 string manipulation instructions, whenever an instruction requires a memory source pointer, which segment and index register pair holds the address?
In standard 8-bit text mode character attribute byte formatting, which bit position controls character blinking on screen?
When executing a word store string operation with repeat prefix (`REP STOSW`), how is the loop counter register `CX` modified per word iteration?
In text mode video memory, each character cell is represented by a 16-bit word. What data is stored in the lower byte (even offset address) of this word?
In text mode video memory, how many total bytes of memory correspond to a single character location on screen?
Explain the significance and behavior of the Direction Flag (DF) when `DF = 0` versus when `DF = 1` during string instructions.