Which primitive string instruction compares a source byte or word in register `AL` or `AX` with the destination string element addressed by `ES:DI` and updates status flags accordingly?
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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Which repeat prefix instruction repeats the following string operation as long as the Zero Flag is set (`ZF = 1`), while `REPNE` / `REPNZ` repeats while the Zero Flag is clear (`ZF = 0`)?
The pointer load instruction `LES reg16, [mem32]` loads a 32-bit far memory pointer into a 16-bit destination register and which segment register?
The pointer load instruction `LDS reg16, [mem32]` loads a 32-bit far memory pointer into a 16-bit destination register and which segment register?
When used with string primitive instructions (such as `MOVSB`), the `REP` prefix repeats the string instruction according to the iteration count stored in which register?
Which primitive string instruction transfers a byte or word from register `AL` or `AX` to the string element addressed by `ES:DI` and automatically updates index register `DI`?
Which primitive string instruction transfers a byte or word from the source location `DS:SI` to `AL` or `AX` and automatically updates index register `SI`?
Which repeat prefix instruction repeats the following string instruction while the Zero Flag is set (`ZF = 1`), whereas `REPNE` or `REPNZ` repeats while the Zero Flag is clear (`ZF = 0`)?
When used with string primitive instructions (such as `MOVSB`), the `REP` prefix repeats the operation according to the iteration count stored in which register?
In the assembly instruction `mov word [es:160], 0x1230`, what character does the low-order byte `0x30` represent when written to text-mode video RAM?