Delta OS

The Delta Operating System (known as Delta OS) is a series of graphical operating systems developed, marketed, and sold by Kadishenware (formerly known as HagsBurg Electronics). It is suitable for home and business computers, also for educational, server services and gaming.

History
The acronym for DELTA OS is "Dynamic Energetic Low-Coast Terminal Advanced Operating System" and the logo used were based on the Greek letter Delta (Δ δ), using the capital letter. The prototypical version, codenamed (DELTA-9) released as Delta DOS/OS

Due to high success of graphical user interface system protocols in HagsBurg, Delta Operating System quickly gained popularity in Pearl and some parts in Japan. Version 1.0 was released on May 13 1984, featuring overlapping windows, taskbar at the top, office suite known as Kiyosaki Office, multitasking command prompt, window buttons to the left, advanced calculator (includes hexadecimal numbers), support for 5.5 and 3.5 floppy disk format, 3D effects-peppered screensaver, its own BASIC dialect and extension (DeltaBASIC) and notepad that can open files greater than 64kb. The license allows users to resell their copies, modifying them and distributing them, nowadays can be classified as free software license.

When the operating system first started its American market in July 21 1984, HagsBurg was sued by Apple Computers for copying "look and feel".

Few updates were released though 1985-1988, mostly for bug fixes and feature enhancements, such as version 1.1, released on December 18 1984, fixed bug problems at the 3D screensaver and added more fonts to the Kiyosaki Writer app and very few GUI changes to the operating system.

Version 1.4, the biggest one so far, was released on 19 April 1989, included 256 color support, VHS video support, CD playback audio, 3D support, Internet support and disk encryption tool. It gained popularity for being preinstalled in the computer ZX-1634 "Laxeros" (although it is also preinstalled on other computers), that used 3.5 inches floppy disks, Video CD, S-VHS and wax cylinders. ZX-1634 was popular for using wax cylinder as one of formats used.

In 1991, HagsBurg implemented an operating system named DX, a variant of Delta Operating System running on top of modified Unix System V kernel, which is slightly more advanced than the mainline version of Delta OS. It includes X11 Window System, which would be ported to mainline Delta OS shortly thereafter.