Counterpedia · Subject

Wikidata observation

Sinclair ZX81

home computer produced by Sinclair Research

Also known as (1)

ZX81

Observations from Wikidata; separate from governed Counterpedia records. Sources, origins and what has been checked

At a glance

Selected recorded observations. Counterpedia has not independently verified them; inspect the statements for sources and alternative or historical context.

subclass of: home computer
About this property
A broader class whose members include every member of this class. This is different from an individual being an instance of a class.
Wikidata property P279; Statement & references
inception: 5 March 1981
About this property
This names the relationship or attribute recorded by Wikidata. Any context shown beside it qualifies this particular statement.
Wikidata property P571; Statement & references
mass: 350 Q41803
About this property
This names the relationship or attribute recorded by Wikidata. Any context shown beside it qualifies this particular statement.
Wikidata property P2067; Statement & references
instance of: computer model
About this property
This names the relationship or attribute recorded by Wikidata. Any context shown beside it qualifies this particular statement.
Wikidata property P31; Statement & references

How these facts are selected

Up to eight distinct properties with readable names and values. One from each available category comes first, then remaining slots follow property category, property code and source order. This keeps names and family details from crowding out work, dates and geography. Media, external identifiers, unnamed targets and statements with incomplete qualifying context stay in the detailed list. The same rule applies to every subject. Context recorded by Wikidata appears beside each selected fact.

Relationships

Outgoing connections are statements about this subject. A connection is not evidence that another subject supports a claim.

Relationship name unavailable: Timex Group USA
Relationship name unavailable: Sinclair BASIC
Relationship name unavailable: Sinclair ZX80
Relationship name unavailable: Zilog Z80A
Relationship name unavailable: ZX Spectrum
Relationship name unavailable: Sinclair Research
subclass of (P279): home computer
instance of (P31): computer model

All projected connections & provider records

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Sinclair ZX81

Other entries this record states a relationship to. Follow one to keep moving through the universe.

Identity & relations

home computer— subclass of (P279)stated relationship
computer model— instance of (P31)stated relationship

Other connections

Timex Group USA— P176stated relationship
Sinclair BASIC— P306stated relationship
Sinclair ZX80— P155stated relationship
Zilog Z80A— P880stated relationship
ZX Spectrum— P156stated relationship
Sinclair Research— P178stated relationship

The original records this observation was assembled from, off Counterpedia.

Wikidata: Q263250 ↗

Keep exploring the surrounding neighborhood.

Explore the Sinclair ZX81 neighborhood

Assembled from entry read model wikimedia_observation:Q263250, public release sha256:f33228901a35b0683356002a46df9ceb11f399d05f17abb5c7c78256cbf38ba7. This view is served from published release bytes.

Explore incoming and outgoing relationships →

External identifiers (27)

Identifier lookup links, separate from statement references.

P13599: 35
P5936: 263
P646: /m/089dw
P13513: sinclair-zx-81
P5795: sinclair-zx81
P11122: Sinclair_ZX-81_Beocomp
GND: 4068310-2 ↗
Library of Congress (LCCN): sh85122794 ↗
P4806: 72690
P11122: Sinclair_ZX-81_Kit
P724: Sinclair_ZX81_TOSEC_2012_04_23
P7757: 77
P5868: zx81
P8189: 987007546153605171
P8647: sj2021054901
P7592: 23052
P8408: Zx81
P11122: Sinclair_ZX-81
P12216: 150
P11129: ZX81
P11122: Sinclair_ZX-81_german
P7556: 53
P11771: 204035
P12946: ZX-81
P10851: 95
P3847: sinclair_zx81_(computer)
P7809: 147

Sources and origins

Structured observations: Statements in this view were observed in Wikidata. Their source identifiers and carried history remain available for inspection.
Cited references: Works, URLs and identifiers attached to particular statements. A cited locator is not an independently established support finding. Inspect statement references
Retained evidence: This view carries observation data. It does not supply independently captured copies of the cited documents or establish their custody. Discovering a reference does not register a governed Source Record.
Checks: No completed Check is associated with these statements in this view. Check execution is currently unavailable.

These observations are not governed Counterpedia claims. The origin of an observation can differ from the author or publisher of its cited source.

Documentary coverage

Documentary identifiers

No source identifiers recorded

Identifiers Counterpedia can route

No lookup route known

Reference-route hints

Reference route hint recorded

“Routable” means Counterpedia knows an approved provider capability that can investigate the identifier. It does not mean the source has been captured or checked.

Validation state

1. In Wikidata
No source identifiers recorded.
2. Lookup route
No source identifiers recorded.
3. Lookup result
No lookup recorded for this page.
4. Saved copy
No saved copy for this page.
5. Fixed version
No fixed source version for this page.
6. Check result
Not checked.

These stages describe what this page can show from governed subject-scoped records. A lookup route does not mean a source was found; a lookup result does not mean bytes were saved; and a saved copy does not mean a fixed source version or a Check result exists.

Research frontier

Ready to investigate

None of the recorded identifier routes is marked routable.

Still unresolved

27 identifier routes and 5 reference hints remain research inputs rather than governed evidence.

Authority boundary

What this page establishes

It establishes what the retained Wikimedia observation contains and what investigation paths Counterpedia can describe from that material.

What it does not establish

A Wikidata statement is not automatically Counterpedia evidence.
A routable identifier is not a captured source.
A captured representation is not automatically a fixed source version.
A fixed source version is not automatically a Check result.
Graph proximity and reference counts are not support or corroboration.
A provider observation and candidate locator do not establish source bytes or support.

Presentation contract

Stage template: counterpedia.reader.profile.v1
Counterpedia composition: counterpedia.product.subject.profile.v1

Statements & recorded references

Open a statement to see the references attached to it. Context can limit when, where or how a statement applies. Recorded source URLs, identifier resolvers and source works describe where Wikidata points; none establishes source support or a completed Check.

Check execution is unavailable in this preview. Exact recorded locators remain available to inspect and open.

image: Sinclair-ZX81.pngReference count not carried
Observation origin: Wikidata. References below are citations attached to this statement, not independently captured evidence.
About this property
This names the relationship or attribute recorded by Wikidata. Any context shown beside it qualifies this particular statement.
Wikidata property P18
No exact source locator is carried for this statement in this view.
Statement identity, reference hashes and carried detail
```
{
  "predicate": "P18",
  "literalValue": "Sinclair-ZX81.png"
}
```
mass: 350 Q41803Reference count not carried
Observation origin: Wikidata. References below are citations attached to this statement, not independently captured evidence.
About this property
This names the relationship or attribute recorded by Wikidata. Any context shown beside it qualifies this particular statement.
Wikidata property P2067
No exact source locator is carried for this statement in this view.
Statement identity, reference hashes and carried detail
```
{
  "predicate": "P2067",
  "literalValue": {
    "amount": "+350",
    "unit": "http://www.wikidata.org/entity/Q41803"
  }
}
```
Relationship name unavailable: Timex Group USAReference count not carried
Observation origin: Wikidata. References below are citations attached to this statement, not independently captured evidence.
About this property
The readable name for this property is unavailable here. Its code and exact recorded value are preserved; the code alone does not explain the relationship.
Wikidata property P176
No exact source locator is carried for this statement in this view.
Statement identity, reference hashes and carried detail
```
{
  "predicate": "P176",
  "targetRef": "Q1644618",
  "targetLabel": "Timex Group USA"
}
```
Relationship name unavailable: 1984Reference count not carried
Observation origin: Wikidata. References below are citations attached to this statement, not independently captured evidence.
About this property
The readable name for this property is unavailable here. Its code and exact recorded value are preserved; the code alone does not explain the relationship.
Wikidata property P730
No exact source locator is carried for this statement in this view.
Statement identity, reference hashes and carried detail
```
{
  "predicate": "P730",
  "literalValue": {
    "after": 0,
    "before": 0,
    "calendarmodel": "http://www.wikidata.org/entity/Q1985727",
    "precision": 9,
    "time": "+1984-00-00T00:00:00Z",
    "timezone": 0
  }
}
```
Relationship name unavailable: Sinclair BASICReference count not carried
Observation origin: Wikidata. References below are citations attached to this statement, not independently captured evidence.
About this property
The readable name for this property is unavailable here. Its code and exact recorded value are preserved; the code alone does not explain the relationship.
Wikidata property P306
No exact source locator is carried for this statement in this view.
Statement identity, reference hashes and carried detail
```
{
  "predicate": "P306",
  "targetRef": "Q2074777",
  "targetLabel": "Sinclair BASIC"
}
```
Relationship name unavailable: Sinclair ZX80Reference count not carried
Observation origin: Wikidata. References below are citations attached to this statement, not independently captured evidence.
About this property
The readable name for this property is unavailable here. Its code and exact recorded value are preserved; the code alone does not explain the relationship.
Wikidata property P155
No exact source locator is carried for this statement in this view.
Statement identity, reference hashes and carried detail
```
{
  "predicate": "P155",
  "targetRef": "Q602406",
  "targetLabel": "Sinclair ZX80"
}
```
inception: 5 March 1981Reference count not carried
Observation origin: Wikidata. References below are citations attached to this statement, not independently captured evidence.
About this property
This names the relationship or attribute recorded by Wikidata. Any context shown beside it qualifies this particular statement.
Wikidata property P571
No exact source locator is carried for this statement in this view.
Statement identity, reference hashes and carried detail
```
{
  "predicate": "P571",
  "literalValue": {
    "after": 0,
    "before": 0,
    "calendarmodel": "http://www.wikidata.org/entity/Q1985727",
    "precision": 11,
    "time": "+1981-03-05T00:00:00Z",
    "timezone": 0
  }
}
```
Relationship name unavailable: Zilog Z80AReference count not carried
Observation origin: Wikidata. References below are citations attached to this statement, not independently captured evidence.
About this property
The readable name for this property is unavailable here. Its code and exact recorded value are preserved; the code alone does not explain the relationship.
Wikidata property P880
No exact source locator is carried for this statement in this view.
Statement identity, reference hashes and carried detail
```
{
  "predicate": "P880",
  "targetRef": "Q114405361",
  "targetLabel": "Zilog Z80A"
}
```
Relationship name unavailable: ZX SpectrumReference count not carried
Observation origin: Wikidata. References below are citations attached to this statement, not independently captured evidence.
About this property
The readable name for this property is unavailable here. Its code and exact recorded value are preserved; the code alone does not explain the relationship.
Wikidata property P156
No exact source locator is carried for this statement in this view.
Statement identity, reference hashes and carried detail
```
{
  "predicate": "P156",
  "targetRef": "Q23882",
  "targetLabel": "ZX Spectrum"
}
```

Relationship name unavailable: 19841 recorded reference

Observation origin: Wikidata. References below are citations attached to this statement, not independently captured evidence.

About this property

The readable name for this property is unavailable here. Its code and exact recorded value are preserved; the code alone does not explain the relationship.

Wikidata property P2669

No exact source locator is carried for this statement in this view.

Statement identity, reference hashes and carried detail

{
  "predicate": "P2669",
  "literalValue": {
    "after": 0,
    "before": 0,
    "calendarmodel": "http://www.wikidata.org/entity/Q1985727",
    "precision": 9,
    "time": "+1984-00-00T00:00:00Z",
    "timezone": 0
  },
  "referencesSummary": {
    "referenceCount": 1,
    "referencePropertyPids": [
      "P143",
      "P4656"
    ],
    "referenceHashes": [
      "2034e718f3750a35916daa88ab2996d96315c124"
    ],
    "propertyPidSummaryTruncated": false,
    "referenceHashSummaryTruncated": false
  }
}

Relationship name unavailable: Sinclair ResearchReference count not carried
Observation origin: Wikidata. References below are citations attached to this statement, not independently captured evidence.
About this property
The readable name for this property is unavailable here. Its code and exact recorded value are preserved; the code alone does not explain the relationship.
Wikidata property P178
No exact source locator is carried for this statement in this view.
Statement identity, reference hashes and carried detail
```
{
  "predicate": "P178",
  "targetRef": "Q4409",
  "targetLabel": "Sinclair Research"
}
```

Relationship name unavailable: 490 Q1841721 recorded referenceRecorded context: Relationship name unavailable: France; point in time: 1981This statement has context that cannot be fully shown here. An unresolved name or missing qualification can change how it should be understood.

Observation origin: Wikidata. References below are citations attached to this statement, not independently captured evidence.

About this property

The readable name for this property is unavailable here. Its code and exact recorded value are preserved; the code alone does not explain the relationship.

Wikidata property P2284

No exact source locator is carried for this statement in this view.

Qualifiers

Relationship name unavailable: France

point in time: 1981

Statement identity, reference hashes and carried detail

{
  "predicate": "P2284",
  "literalValue": {
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  },
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    "propertyPidSummaryTruncated": false,
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  },
  "qualifiers": {
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    "retainedSnaks": [
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        "datatype": "wikibase-item",
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            "id": "Q142",
            "numeric-id": 142
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        },
        "snaktype": "value"
      },
      {
        "propertyPid": "P585",
        "datatype": "time",
        "datavalue": {
          "type": "time",
          "value": {
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            "before": 0,
            "calendarmodel": "http://www.wikidata.org/entity/Q1985727",
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            "time": "+1981-00-00T00:00:00Z",
            "timezone": 0
          }
        },
        "snaktype": "value"
      }
    ],
    "truncated": false
  }
}

Relationship name unavailable: 15000001 recorded reference
Observation origin: Wikidata. References below are citations attached to this statement, not independently captured evidence.
About this property
The readable name for this property is unavailable here. Its code and exact recorded value are preserved; the code alone does not explain the relationship.
Wikidata property P2664
No exact source locator is carried for this statement in this view.
Statement identity, reference hashes and carried detail
```
{
  "predicate": "P2664",
  "literalValue": {
    "amount": "+1500000",
    "unit": "1"
  },
  "referencesSummary": {
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    "referenceHashes": [
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    ],
    "propertyPidSummaryTruncated": false,
    "referenceHashSummaryTruncated": false
  }
}
```
Relationship name unavailable: https://stackoverflow.com/tags/zx81Reference count not carried
Observation origin: Wikidata. References below are citations attached to this statement, not independently captured evidence.
About this property
The readable name for this property is unavailable here. Its code and exact recorded value are preserved; the code alone does not explain the relationship.
Wikidata property P1482
No exact source locator is carried for this statement in this view.
Statement identity, reference hashes and carried detail
```
{
  "predicate": "P1482",
  "literalValue": "https://stackoverflow.com/tags/zx81"
}
```
subclass of: home computer1 recorded reference
Observation origin: Wikidata. References below are citations attached to this statement, not independently captured evidence.
About this property
A broader class whose members include every member of this class. This is different from an individual being an instance of a class.
Wikidata property P279
No exact source locator is carried for this statement in this view.
Statement identity, reference hashes and carried detail
```
{
  "predicate": "P279",
  "targetRef": "Q473708",
  "targetLabel": "home computer",
  "referencesSummary": {
    "referenceCount": 1,
    "referencePropertyPids": [
      "P143",
      "P4656"
    ],
    "referenceHashes": [
      "b2169c74171c093e22e8f80c1b1a6e39d72b4b74"
    ],
    "propertyPidSummaryTruncated": false,
    "referenceHashSummaryTruncated": false
  }
}
```
Commons category: Sinclair ZX81Reference count not carried
Observation origin: Wikidata. References below are citations attached to this statement, not independently captured evidence.
About this property
This names the relationship or attribute recorded by Wikidata. Any context shown beside it qualifies this particular statement.
Wikidata property P373
No exact source locator is carried for this statement in this view.
Statement identity, reference hashes and carried detail
```
{
  "predicate": "P373",
  "literalValue": "Sinclair ZX81"
}
```
instance of: computer modelReference count not carried
Observation origin: Wikidata. References below are citations attached to this statement, not independently captured evidence.
About this property
This names the relationship or attribute recorded by Wikidata. Any context shown beside it qualifies this particular statement.
Wikidata property P31
No exact source locator is carried for this statement in this view.
Statement identity, reference hashes and carried detail
```
{
  "predicate": "P31",
  "targetRef": "Q55990535",
  "targetLabel": "computer model"
}
```

Relationship name unavailable: 19811 recorded reference

Observation origin: Wikidata. References below are citations attached to this statement, not independently captured evidence.

About this property

The readable name for this property is unavailable here. Its code and exact recorded value are preserved; the code alone does not explain the relationship.

Wikidata property P577

No exact source locator is carried for this statement in this view.

Statement identity, reference hashes and carried detail

{
  "predicate": "P577",
  "literalValue": {
    "after": 0,
    "before": 0,
    "calendarmodel": "http://www.wikidata.org/entity/Q1985727",
    "precision": 9,
    "time": "+1981-00-00T00:00:00Z",
    "timezone": 0
  },
  "referencesSummary": {
    "referenceCount": 1,
    "referencePropertyPids": [
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    ],
    "referenceHashes": [
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    ],
    "propertyPidSummaryTruncated": false,
    "referenceHashSummaryTruncated": false
  }
}

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Data and provenance

Wikidata entity IDs are external identifiers, not Counterpedia canonical subject identities. Rendering this page does not mint a governed identity. Release identities and artifact hashes identify the data used for this view; none establishes verification.

Provenance rows: 48
Acquisition repository: thelaplage/counterpedia-acquisition
Acquisition revision: e6add6a4d8e1668a9ac486407e52974724563ce1, 891f24c5cca64aa69b1dc1b2150e991b940171b0
Provider identity · Observation origin: Wikidata · External entity ID: Q263250 on Wikidata ↗
Served release: sha256:f33228901a35b0683356002a46df9ceb11f399d05f17abb5c7c78256cbf38ba7

No exact claim–source–Check association has been supplied to this page. Recorded references do not establish verification.

graph_membership != truth
graph_edge != support
repeated_identifier != independent_corroboration
projection != admission
Serving a published subset: joined entities + 1-hop neighborhood of 35,994 exact Wikipedia–Wikidata title matches.

Carried provenance rows

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      "snapshot_id": "wikidata-widen0-848k-sitelinks@2026-08-24"
    }
  },
  {
    "family": "wikimedia_graph_row",
    "detail": {
      "acquisition_repo": "thelaplage/counterpedia-acquisition",
      "acquisition_revision": "891f24c5cca64aa69b1dc1b2150e991b940171b0",
      "family": "wikipedia_wikidata_join",
      "input_row_digest": "sha256:500a4e4ce8b881e79e0e2d62cd0c3ddf8a9827c2a08bbbba5df79e4b694e41af",
      "output_file": "wikipedia_wikidata_links.ndjson",
      "row_index": 35733,
      "snapshot_id": "wikimedia-demo-join0@2026-08-28"
    }
  }
]

Classification identities

[
  {
    "classQid": "Q55990535",
    "label": "computer model",
    "href": "/browse/types/Q55990535"
  }
]

Wikidata content CC0; Wikipedia titles CC BY-SA — attribution.