---
title: "More Software — Fast Duet by Cosmonics"
type: "article"
slug: "more-software-fast-duet-by-cosmonics"
url: "http://localhost/article/more-software-fast-duet-by-cosmonics/"
markdown_url: "http://localhost/article/more-software-fast-duet-by-cosmonics.md"
published_at: "2026-03-12T23:20:45+00:00"
modified_at: "2026-03-12T23:20:45+00:00"
featured_image:
  url: "http://localhost/wp-content/uploads/2022/04/20230809-041332.jpg"
excerpt: "A review of Cosmonics' Fast Duet ($27.50), a fast cassette save/load package that operates at 6x normal speed using CFASTDATA (688 bytes) and CFASTLOAD (120 bytes) components."
category:
  - name: "Sinclair Users Network"
    slug: "sinclair-users-network"
    taxonomy: "category"
    url: "http://localhost/category/periodicals/sinclair-users-network/"
post_tag:
  - name: "Cosmonics"
    slug: "cosmonics"
    taxonomy: "post_tag"
    url: "http://localhost/tag/cosmonics/"
  - name: "Software review"
    slug: "software-review"
    taxonomy: "post_tag"
    url: "http://localhost/tag/software-review/"
  - 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/"
publication_r:
  id: 21559
  title: "Sinclair Users Network"
  type: "periodical"
  url: "http://localhost/periodical/sinclair-users-network/"
volume: "2"
issue: "2"
issues_articles:
  - id: 26559
    title: "Sinclair Users Network March 1983"
    type: "issue"
    url: "http://localhost/issue/sinclair-users-network-march-1983/"
pages: "14"
pubdate: "March 1983"
archive_link: false
---

A review of [Cosmonics](http://localhost/company/cosmonics/)‘ [Fast Duet](http://localhost/product/cfastduet/) ($27.50), a fast cassette save/load package that operates at 6x normal speed using CFASTDATA (688 bytes) and CFASTLOAD (120 bytes) components.