Ch 02: 16-Bit Segmented Memory Model & Addressing Modes

Deep dive into 16-bit real mode memory segmentation (CS, DS, SS, ES), pointer/index registers (SP, BP, SI, DI), and calculating effective physical addresses across memory boundaries.

395 Questions395 MCQs0 Short Questions0 Long Questions

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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.

Showing 391 – 395 of 395 Questions

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Q391

📝 Short Q📘 CS401📑 Lec 2🏷️ 2.3. Addressing ModesEasy⭐💡📄🎓VU🏛️VU

Explain Based Register Indirect and Indexed Register Indirect addressing modes in 8086 assembly language, highlighting their default segment associations when using BX, BP, SI, and DI.

💻 assembly Snippet

; Based and Indexed Register Indirect Addressing Examples
mov [bx], ax  ; Based Indirect (DS:BX)
mov [bp], al  ; Based Indirect (SS:BP)
mov [si], ax  ; Indexed Indirect (DS:SI)
mov [di], ax  ; Indexed Indirect (DS:DI)

Q392

📝 Short Q📘 CS401📑 Lec 2🏷️ 2.3. Addressing ModesMedium⭐💡📄🎓VU🏛️VU

How do Based + Offset and Indexed + Offset addressing modes operate in 8086 assembly language? Illustrate with examples using BX, BP, SI, and DI.

💻 assembly Snippet

; Register + Offset Addressing Examples
mov [bx + 300], ax  ; Base + Offset (DS)
mov [bp + 300], ax  ; Base + Offset (SS)
mov [si + 300], ax  ; Index + Offset (DS)
mov [di + 300], al  ; Index + Offset (DS)

Q393

📝 Short Q📘 CS401📑 Lec 2🏷️ 2.3. Addressing ModesMedium⭐💡📄🎓VU🏛️VU

What is Base + Index addressing mode in 8086 assembly language, which register pairs are legally permitted, and what default segment is assigned?

💻 assembly Snippet

; Base + Index Addressing Examples
mov ax, [bx + si]  ; EA = BX + SI (Default DS)
mov ax, [bx + di]  ; EA = BX + DI (Default DS)
mov cx, [bp + si]  ; EA = BP + SI (Default SS)
mov dx, [bp + di]  ; EA = BP + DI (Default SS)

Q394

📝 Short Q📘 CS401📑 Lec 2🏷️ 2.3. Addressing ModesMedium⭐💡📄🎓VU🏛️VU

How does Base + Index addressing mode function in 8086 assembly language, and how is the default segment register determined when combining base registers (BX/BP) with index registers (SI/DI)?

💻 assembly Snippet

; Base + Index Addressing Segment Rules
mov [bx + si], ax  ; Base BX -> Uses Data Segment (DS:[BX+SI])
mov [bp + di], al  ; Base BP -> Uses Stack Segment (SS:[BP+DI])

Q395

📝 Short Q📘 CS401📑 Lec 2🏷️ 2.3. Addressing ModesHard⭐💡📄🎓VU🏛️VU

Describe the Base + Index + Offset addressing mode in 8086 assembly language, give an example instruction, and explain how it can be used to navigate two-dimensional (2D) arrays.

💻 assembly Snippet

; Base + Index + Offset Addressing Example
mov ax, [bx + si + 300]  ; EA = BX + SI + 300 (Relative to DS)

Ch 02: 16-Bit Segmented Memory Model & Addressing Modes

CS401 - Computer Architecture and Assembly Language Programming Examination Practice

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CS401 - Computer Architecture and Assembly Language Programming Examination Practice

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