??? 06/03/05 06:32 Read: times |
#94284 - [OT] - x86 Segments Responding to: ???'s previous message |
Oleg Sergeev said:
Indeed, on PC there is term "memory segment". Due historical reasons (16-bit addresses) such segments are used for expanding of memory with segment registers CS/DS/SS/ES. Just for clarification, the 8086 had a 20-bit (1M byte) address space; being a 16-bit processor, it had 16-bit registers. Therefore it used the Segment+Offset scheme to obtain a 20-bit address from two 16-bit registers. It is not really correct to call this "memory expansion" - it's actually more like PDATA on an 8051 (MOVX @Rn). for memory expanding, Keil uses term "banking". 8051 Banking is more like the Expanded Memory In old PCs - which was used to expand the x86's addressing beyond 1M byte. |
Topic | Author | Date |
Understanding Code Segments Vs Org | 01/01/70 00:00 | |
What Assembler? | 01/01/70 00:00 | |
what assembler | 01/01/70 00:00 | |
here is not PC | 01/01/70 00:00 | |
[OT] - x86 Segments | 01/01/70 00:00 | |
here is not PC![]() | 01/01/70 00:00 |