---
title: "Test-Bit Subroutine"
type: "article"
slug: "test-bit-subroutine"
url: "http://localhost/article/test-bit-subroutine/"
markdown_url: "http://localhost/article/test-bit-subroutine.md"
published_at: "2026-03-14T13:10:39+00:00"
modified_at: "2026-03-14T13:10:39+00:00"
featured_image:
  url: "http://localhost/wp-content/uploads/2022/04/20230809-041332.jpg"
excerpt: "BASIC subroutine (at line 100) allowing the user to determine whether a specific bit (0-7) of any byte address (0-65535) is on (1) or off (0) on the TS1000/TS2068. Includes a demonstration program that prompts for address and bit number and prints the result. Note in listing: adjust line 110 for 1000 vs 2068."
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 1000"
    slug: "ts1000"
    taxonomy: "post_tag"
    url: "http://localhost/tag/ts1000/"
  - name: "TS 2068"
    slug: "ts2068"
    taxonomy: "post_tag"
    url: "http://localhost/tag/ts2068/"
  - name: "Tutorial"
    slug: "tutorial"
    taxonomy: "post_tag"
    url: "http://localhost/tag/tutorial/"
  - name: "Type-in program"
    slug: "type-in-program"
    taxonomy: "post_tag"
    url: "http://localhost/tag/type-in-program/"
model:
  - name: "Timex/Sinclair 1000"
    slug: "ts-1000"
    taxonomy: "model"
    url: "http://localhost/model/ts-1000/"
  - name: "Timex/Sinclair 2068"
    slug: "ts-2068"
    taxonomy: "model"
    url: "http://localhost/model/ts-2068/"
indiv:
  - name: "Jack Dohany"
    slug: "jack-dohany"
    taxonomy: "indiv"
    url: "http://localhost/indiv/jack-dohany/"
publication_r:
  id: 21571
  title: "Timelinez"
  type: "periodical"
  url: "http://localhost/periodical/timelinez/"
authors_r:
  - name: "Jack Dohany"
    slug: "jack-dohany"
    taxonomy: "indiv"
    url: "http://localhost/indiv/jack-dohany/"
volume: "3"
issue: "1"
issues_articles:
  - id: 38815
    title: "Timelinez v3 n1"
    type: "issue"
    url: "http://localhost/issue/timelinez-v3-n1/"
pages: "7"
pubdate: "January 1985"
archive_link: false
---

# Test-Bit Subroutine

BASIC subroutine (at line 100) allowing the user to determine whether a specific bit (0-7) of any byte address (0-65535) is on (1) or off (0) on the TS1000/TS2068. Includes a demonstration program that prompts for address and bit number and prints the result. Note in listing: adjust line 110 for 1000 vs 2068.