---
title: "ZX81 Parallel Input/Output Board"
id: 14806
type: "product"
slug: "zx81-parallel-input-output-board"
url: "http://localhost/product/zx81-parallel-input-output-board/"
markdown_url: "http://localhost/product/zx81-parallel-input-output-board.md"
published_at: "2019-11-30T01:15:19+00:00"
modified_at: "2026-03-22T13:22:51+00:00"
author: "David Anderson"
featured_image:
  url: "http://localhost/wp-content/uploads/2022/04/20230809-041332.jpg"
excerpt: "16 user-programmable lines; fully TTL compatible."
category:
  - name: "Interfacing"
    slug: "interfacing"
    taxonomy: "category"
    url: "http://localhost/category/hardware/interfacing/"
post_tag:
  - name: "Andrew Developments"
    slug: "andrew-developments"
    taxonomy: "post_tag"
    url: "http://localhost/tag/andrew-developments/"
  - name: "TS 1000"
    slug: "ts1000"
    taxonomy: "post_tag"
    url: "http://localhost/tag/ts1000/"
model:
  - name: "Timex/Sinclair 1000"
    slug: "ts-1000"
    taxonomy: "model"
    url: "http://localhost/model/ts-1000/"
genre:
  - name: "Hardware"
    slug: "hardware"
    taxonomy: "genre"
    url: "http://localhost/type/hardware/"
  - name: "Interfacing"
    slug: "interfacing"
    taxonomy: "genre"
    url: "http://localhost/type/interfacing/"
company:
  id: 10647
  title: "Andrew Developments"
  type: "company"
  url: "http://localhost/company/andrew-developments/"
price: 35
date: 1982
rarity: "Uncommon"
adverts:
  - publication:
      - id: 26643
        title: "SYNC v2 n3"
        type: "issue"
        url: "http://localhost/issue/sync-v2-n3/"
    advert_page: "35"
companies_products:
  - id: 10647
    title: "Andrew Developments"
    type: "company"
    url: "http://localhost/company/andrew-developments/"
---

# ZX81 Parallel Input/Output Board

16 user-programmable lines; fully TTL compatible.