What is the difference between 80286 and 80386?
(i) The Intel 80286 is a 16-bit microprocessor that was introduced on 1 February 1982. (iv) The 80386 microprocessor is an enhanced version of the 80286 microprocessor and includes a memory management unit is enhanced to provide memory paging. …
What are the flags in 8086 microprocessor?
8086 has 16-bit flag register, and there are 9 valid flag bits….Status Flags.
| Flag Bit | Function |
|---|---|
| CY | This is carry bit. If some operations are generating carry after the operation this flag is set to 1 |
| O | The overflow flag is set to 1 when the result of a signed operation is too large to fit. |
How many descriptors can be stored in LDT at the most?
The GDT can hold up to 8192 descriptors including obligatory NULL descriptor. Descriptors are identified by 16-bit selectors of the following form. Each application (task) can have its own address space defined by descriptors written in its Local Descriptor Table (LDT).
What is Idtr length?
The IDTR register is used to store both the physical base address and the length in bytes of the IDT. When an interrupt occurs, the processor multiplies the interrupt vector by the entry size (8 for protected mode, 16 for long mode) and adds the result to the IDT base address.
How large is a real mode memory segment?
In real mode or V86 mode, the size of a segment can range from 1 byte up to 65,536 bytes (using 16-bit offsets).
Which unit is not used in real mode?
Explanation: All the instructions of 80386 are available in this mode except for those designed to work with or for protected address mode. Explanation: The paging unit is disabled in real address mode.
What is stored in extra segment?
Data segment register (DS): points to the data segment of the memory where the data is stored. Extra Segment Register (ES): also refers to a segment in the memory which is another data segment in the memory. The stack segment is that segment of memory which is used to store stack data.