---
title: "Converting Your Sinclair Keyboard Mule Electronics"
id: 35586
type: "document"
slug: "converting-your-sinclair-keyboard-mule-electronics"
url: "http://localhost/document/converting-your-sinclair-keyboard-mule-electronics/"
markdown_url: "http://localhost/document/converting-your-sinclair-keyboard-mule-electronics.md"
published_at: "2021-01-10T00:38:34+00:00"
modified_at: "2026-03-15T17:26:42+00:00"
author: "David Anderson"
featured_image:
  url: "http://localhost/wp-content/uploads/2022/04/20230809-041332.jpg"
excerpt: "Instructions from MULE Electronics for converting a Sinclair ZX-81 or TS-1000 to use an external keyboard, explaining the grid-matrix circuit, keyboard selection criteria, wiring diagram, and installation with optional wooden mounting bracket."
category:
  - name: "Documentation"
    slug: "documentation"
    taxonomy: "category"
    url: "http://localhost/category/documentation/"
post_tag:
  - name: "MULE Electronics"
    slug: "mule-electronics"
    taxonomy: "post_tag"
    url: "http://localhost/tag/mule-electronics/"
  - 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/"
doc_author: "MULE Electronics"
document_url: "http://archive.org/details/ConvertingYourSinclairKeyboardMuleElectronics"
document_date: "1982"
related_content:
  - id: 11127
    title: "MULE Electronics"
    type: "company"
    url: "http://localhost/company/mule-electronics/"
  - id: 14801
    title: "ZX81 Key-Top Symbols in 3 Colors"
    type: "product"
    url: "http://localhost/product/zx81-key-top-symbols-in-3-colors/"
---

# Converting Your Sinclair Keyboard Mule Electronics

Instructions from MULE Electronics for converting a Sinclair ZX-81 or TS-1000 to use an external keyboard, explaining the grid-matrix circuit, keyboard selection criteria, wiring diagram, and installation with optional wooden mounting bracket.