---
title: "Exploring the TS1000 Sinclair Logic Chip (SCL) VI"
type: "article"
slug: "exploring-the-ts1000-sinclair-logic-chip-scl-vi-2"
url: "http://localhost/article/exploring-the-ts1000-sinclair-logic-chip-scl-vi-2/"
markdown_url: "http://localhost/article/exploring-the-ts1000-sinclair-logic-chip-scl-vi-2.md"
published_at: "2026-01-11T14:49:32+00:00"
modified_at: "2026-01-11T14:49:33+00:00"
featured_image:
  url: "http://localhost/wp-content/uploads/2022/04/20230809-041332.jpg"
excerpt: "This article is a continuation of the series which began in the October 1989 issue of QZX. The purpose is to explain the function of the SCL logic chip in the ZX and TS1000 series of Sinclair computers. This chip is a custom chip designed particularly for our computers. The previous articles gave some background…"
category:
  - name: "QZX"
    slug: "qzx"
    taxonomy: "category"
    url: "http://localhost/category/periodicals/qzx/"
post_tag:
  - 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/"
indiv:
  - name: "Don Lamen"
    slug: "don-lamen"
    taxonomy: "indiv"
    url: "http://localhost/indiv/don-lamen/"
publication: "QZX"
publication_r:
  id: 21219
  title: "QZX"
  type: "periodical"
  url: "http://localhost/periodical/qzx/"
authors_r:
  - name: "Don Lamen"
    slug: "don-lamen"
    taxonomy: "indiv"
    url: "http://localhost/indiv/don-lamen/"
volume: "8"
issue: "5"
issues_articles:
  - id: 50211
    title: "QZX v8 n5"
    type: "issue"
    url: "http://localhost/issue/qzx-v8-n5/"
pages: "5-6"
pubdate: "April 1990"
archive_link: false
---

# Exploring the TS1000 Sinclair Logic Chip (SCL) VI

This article is a continuation of the series which began in the October 1989 issue of QZX. The purpose is to explain the function of the SCL logic chip in the ZX and TS1000 series of Sinclair computers. This chip is a custom chip designed particularly for our computers. The previous articles gave some background on the chip, provided a functional diagram, and listed 17 separate functions performed by the chip. These and succeeding articles discuss these functions individually and provide an equivalent circuit diagram for the function. These circuit diagrams are only the equivalent of the actual circuits inside the chip because nothing is known about the real connections inside, but the circuits given here will perform the function of the real circuit. For a list of these 17 functions see the October issue of QZX.