R6 (stack pointer)
E697036
R6 (stack pointer) is the dedicated hardware register on the PDP-11 used to manage the call stack and control subroutine linkage.
All labels observed (1)
| Label | Occurrences |
|---|---|
| R6 (stack pointer) canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7920725 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: R6 (stack pointer) Context triple: [PDP-11, hasRegister, R6 (stack pointer)]
-
A.
R68
The R68 is a class of New York City Subway cars built in the 1980s for the B Division, known for their stainless-steel bodies and use on various lettered lines.
-
B.
R68A
R68A is a class of New York City Subway cars built in the late 1980s for B Division services, known for their stainless-steel bodies and use on lines such as the B and D.
-
C.
R-4
The R-4 is a World War II–era Sikorsky helicopter recognized as the first mass-produced helicopter and the first to be used operationally by the U.S. military.
-
D.
R9
R9 is the iconic nickname of Brazilian football legend Ronaldo Luís Nazário de Lima, renowned as one of the greatest strikers in the history of the sport.
-
E.
R4
R4 is a government office building in Oslo that forms part of Norway’s central Regjeringskvartalet complex.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: R6 (stack pointer) Target entity description: R6 (stack pointer) is the dedicated hardware register on the PDP-11 used to manage the call stack and control subroutine linkage.
-
A.
R68
The R68 is a class of New York City Subway cars built in the 1980s for the B Division, known for their stainless-steel bodies and use on various lettered lines.
-
B.
R68A
R68A is a class of New York City Subway cars built in the late 1980s for B Division services, known for their stainless-steel bodies and use on lines such as the B and D.
-
C.
R-4
The R-4 is a World War II–era Sikorsky helicopter recognized as the first mass-produced helicopter and the first to be used operationally by the U.S. military.
-
D.
R9
R9 is the iconic nickname of Brazilian football legend Ronaldo Luís Nazário de Lima, renowned as one of the greatest strikers in the history of the sport.
-
E.
R4
R4 is a government office building in Oslo that forms part of Norway’s central Regjeringskvartalet complex.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
PDP-11 register
ⓘ
hardware stack pointer ⓘ |
| accessedBy |
PDP-11 instruction set
ⓘ
linked to:
PDP-11
|
| addressSpace | PDP-11 address space ⓘ |
| alsoKnownAs |
SP
ⓘ
stack pointer ⓘ |
| architecture | PDP-11 ⓘ |
| category |
CPU register
ⓘ
computer architecture concept ⓘ |
| controls |
stack-based parameter passing
ⓘ
stack-based return addresses ⓘ subroutine linkage ⓘ |
| convention | reserved for stack pointer ⓘ |
| dataWidth | 16-bit ⓘ |
| dedicatedTo |
stack operations
ⓘ
subroutine call stack ⓘ |
| hasSemanticRole | stack base for procedure activation records ⓘ |
| introducedIn | early PDP-11 models ⓘ |
| manages |
call stack
ⓘ
runtime stack frames ⓘ |
| manufacturer | Digital Equipment Corporation ⓘ |
| partOf |
PDP-11 architecture
ⓘ
linked to:
PDP-11
|
| registerClass | general-purpose register ⓘ |
| registerNumber | 6 ⓘ |
| relatedRegister |
R5 (frame pointer)
ⓘ
R7 (program counter) ⓘ |
| role |
call stack management
ⓘ
stack management ⓘ subroutine linkage control ⓘ |
| stores | top of stack address ⓘ |
| supportsAddressingMode |
autodecrement
ⓘ
autoincrement ⓘ indexed ⓘ |
| updatedOn |
subroutine entry
ⓘ
subroutine exit ⓘ |
| usedBy |
PDP-11 assemblers
ⓘ
PDP-11 operating systems ⓘ PDP-11 subroutine call conventions ⓘ |
| usedFor |
pop operations
ⓘ
procedure calls ⓘ procedure returns ⓘ push operations ⓘ |
| usedIn |
context switching
ⓘ
stack-based interrupt handling ⓘ |
| usedOn |
PDP-11 minicomputer
ⓘ
linked to:
PDP-11
|
| usedWith |
PDP-11 assembly language
ⓘ
linked to:
Assembly language
|
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: R6 (stack pointer) Description of subject: R6 (stack pointer) is the dedicated hardware register on the PDP-11 used to manage the call stack and control subroutine linkage.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.