Discussion of is-DOS system issues, user experiences, and developer policies.

The advertisement section of Spectrofon #13 provides contact information for purchasing the magazine, promoting collaboration opportunities for program developers, and offering various Spectrum-related products and services.

This article provides guidance for several ZX Spectrum games, including tips for overcoming challenges and critiques on the influence of games on players.

Discussion on the challenges and potential improvements for the PROFI computer, including compatibility issues with other systems and software development. Critique of the company 'KONDOR' and their engagement with users and the Spectrum community. Exploration of the roles of different software and hardware in enhancing the utility of the PROFI.

IskraSoft introduces IS-DOS Classic 4.0 with advanced text editing features, a disk utility, a hard drive controller for ZX Spectrum, and a program debugger.

Overview of IS-DOS for ZX Spectrum, highlighting its advantages over TR-DOS. Discussion on installation, usage, and file management features of IS-DOS. Introduction to system utilities and interface similar to Norton Commander.

The article provides a concise guide to the IS-DOS system disk, listing all essential files with explanations. Files are sorted alphabetically and grouped by directories for easy navigation. The guide focuses on a basic overview of files and commands without extensive descriptions.

Discussion of IS-DOS window interface features. Implementation of window system in IS-DOS and its advantages. Example programs for creating windows and frames.

Announcement of a school-ready hardware-software complex by Iskra Soft and Peters, featuring a networked computer class setup on ZX Spectrum with IS-DOS.