---
title: "Use of the IN Function: Dual Simultaneous Keypresses on TS2068"
type: "article"
slug: "use-of-the-in-function-dual-simultaneous-keypresses-on-ts2068"
url: "http://localhost/article/use-of-the-in-function-dual-simultaneous-keypresses-on-ts2068/"
markdown_url: "http://localhost/article/use-of-the-in-function-dual-simultaneous-keypresses-on-ts2068.md"
published_at: "2026-03-14T12:43:22+00:00"
modified_at: "2026-03-14T12:43:23+00:00"
featured_image:
  url: "http://localhost/wp-content/uploads/2022/04/20230809-041332.jpg"
excerpt: "Explains detecting two simultaneous keypresses on the TS2068 using the IN function with specific port addresses. Includes a port address table and an Etch-a-Sketch style BASIC program demonstrating simultaneous joystick/key inputs for on-screen sketching using INVERSE PLOT."
category:
  - name: "Timelinez"
    slug: "timelinez"
    taxonomy: "category"
    url: "http://localhost/category/periodicals/timelinez/"
post_tag:
  - name: "BASIC (programming language)"
    slug: "basic-programming-language"
    taxonomy: "post_tag"
    url: "http://localhost/tag/basic-programming-language/"
  - name: "TS 2068"
    slug: "ts2068"
    taxonomy: "post_tag"
    url: "http://localhost/tag/ts2068/"
  - name: "Type-in program"
    slug: "type-in-program"
    taxonomy: "post_tag"
    url: "http://localhost/tag/type-in-program/"
model:
  - name: "Timex/Sinclair 2068"
    slug: "ts-2068"
    taxonomy: "model"
    url: "http://localhost/model/ts-2068/"
indiv:
  - name: "George Chambers"
    slug: "george-chambers"
    taxonomy: "indiv"
    url: "http://localhost/indiv/george-chambers/"
publication_r:
  id: 21571
  title: "Timelinez"
  type: "periodical"
  url: "http://localhost/periodical/timelinez/"
authors_r:
  - name: "George Chambers"
    slug: "george-chambers"
    taxonomy: "indiv"
    url: "http://localhost/indiv/george-chambers/"
volume: "3"
issue: "6"
issues_articles:
  - id: 38821
    title: "Timelinez v3 n6"
    type: "issue"
    url: "http://localhost/issue/timelinez-v3-n6/"
pages: "5"
pubdate: "June 1985"
archive_link: false
---

# Use of the IN Function: Dual Simultaneous Keypresses on TS2068

Explains detecting two simultaneous keypresses on the TS2068 using the IN function with specific port addresses. Includes a port address table and an Etch-a-Sketch style BASIC program demonstrating simultaneous joystick/key inputs for on-screen sketching using INVERSE PLOT.