---
title: "40 Column Mode Support (ASC 003)"
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published_at: "2026-10-18T23:32:30+00:00"
modified_at: "2026-10-18T23:35:25+00:00"
author: "David Anderson"
featured_image:
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excerpt: "Application Software Component 003 from Timex’s Application Development Library. It’s a machine-code module that puts 40 columns of text on the TS2068’s ordinary screen, with characters six pixels wide. It doesn’t change the video mode. It writes to whichever display file the system variable VIDMOD points at, so it can also work on the second…"
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  - name: "TS 2068"
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model:
  - name: "Timex/Sinclair 2068"
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  - name: "V. Carole Corcoran"
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doc_author: "V. Corcoran"
document_url: "https://archive.org/details/timex-computer-corp/40%20Column%20Mode"
pages: 59
document_date: "1984"
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  - id: 71880
    title: "40 and 80 Column Mode Support"
    type: "computer_media"
    url: "http://localhost/computer_media/40-and-80-column-mode-support/"
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    title: "Timex Computer Corporation"
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---

# 40 Column Mode Support (ASC 003)

Application Software Component 003 from Timex’s Application Development Library. It’s a machine-code module that puts 40 columns of text on the TS2068’s ordinary screen, with characters six pixels wide. It doesn’t change the video mode. It writes to whichever display file the system variable VIDMOD points at, so it can also work on the second display file alongside ASC 004.

The first 15 pages are the typed documentation: the services, how to call them from BASIC, and notes on memory use, margins, automatic scrolling and color.