In subject area: Computer Science Segmented memory is defined as a memory management technique where memory addresses are divided into segments and offsets. This allows for larger memory sizes by reloading segment registers to access different parts of memory. AI generated definition based on: Embedde...
Memory addressing in which each byte is referenced by a base number (the segment) plus an offset. An x86-based PC running in 16-bit mode (Real Mode and Virtual 8086 Mode) uses 64KB segments, and a segment register always points to the base of the segment that is currently being addresse...
A segment reg- ister (e.g., cs) points at the beginning of a segment in memory. Segments of memory on the 8086 can be no larger than 65,536 bytes long. This infa- mous "64K segment limitation" has disturbed many a programmer. We'll see some prob- lems with this 64K limitation,...
In 16-bit real mode, enabling applications to make use of multiple memory segments (in order to access more memory than available in any one 64K-segment) was quite complex, but was viewed as a necessary evil for all but the smallest tools (which could do with less memory). The root of...
The final four registers in the 8086 list (SS, CS, DS, and ES) are the segment pointers. They were used to point to segments in RAM. A 16-bit pointer can point to at most 64 kilobytes of different RAM addresses. Some systems at the time had more than 64 kilobytes of RAM. In ...
. This simple rule would enable segments to address 4 gigs of memory in 64K chunks, but it would increase chip packaging costs by requiring more physical address pins in the processor. So Intel made the decision to multiply the segment selector by only 24 (or 16), which in a single...
USBLog(1,"%s[%p]::CheckForDisjointDescriptor - err (%p) trying to generate segments at offset (%qd), length (%d), segLength (%d), total length (%d), buf (%p), numSegments (%d)", getName(),this, (void*)err, offset64, (int)length, (int)segLength, (int)command->GetReqCount...
It is known that the loading of data from the cache that contains data or instructions into the processor core is faster than the loading from the corresponding segments or pages of the working memory of the computer system. It should be added that the event of a miss in the cache memory...
Real mode programs can run on the 8086 and 8088 processors that were in the original IBM PCs and compatibles. In real mode DOS programs, code and data are stored in 64KB segments. DOS limits programs to 640KB bytes of memory, including both code and data. ...
In this mode, even though the machine is running in protected mode, the 80386 uses 8086-type selector and addressing. The 80386's 64-terabyte virtual address space is composed of 16,000 segments of 4 gigabytes each.被引量: 1 年份: 1986 ...