Timeline for Undocumented instructions in x86 CPU prior to 80386?
Current License: CC BY-SA 4.0
8 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 21 at 0:10 | comment | added | Arioch | But there are more "segment override prefix" opcodes: 0x3E for DS and 0x36 for SS. Wonder why they were not tried... | |
| Dec 1, 2022 at 15:01 | history | edited | 640KB | CC BY-SA 4.0 | add SALC to TLDR |
| Nov 28, 2022 at 16:13 | history | edited | 640KB | CC BY-SA 4.0 | add SALC |
| Jun 6, 2022 at 19:11 | history | edited | 640KB | CC BY-SA 4.0 | added 498 characters in body |
| Jun 6, 2022 at 16:27 | history | edited | 640KB | CC BY-SA 4.0 | clarify STOS |
| Jun 6, 2022 at 16:20 | comment | added | ecm | stosb is documented as not accepting a segment override; all default uses of es in string operations cannot be overridden. (scasb is the same, movsb and cmpsb allow an override but it only affects the ds:si operand, not the es:di one.) | |
| Jun 6, 2022 at 15:26 | history | edited | 640KB | CC BY-SA 4.0 | add pic of IC |
| Jun 6, 2022 at 15:20 | history | answered | 640KB | CC BY-SA 4.0 |