The National Archives
Search our website
  • Search our website
  • Search our records
Image of software box and CD PRONOM
Welcome (PRONOM  home page) About PRONOM Add an entry
Search Help - opens in a new window Information resources - opens in a new window

*Details: File format summary



Search by keyword Search by file format Search by PUID Search by software Search by vendor Search by lifecycles Search by Migration Pathway

Details for:

Save as... XML | CSV Printer friendly version


Name Spectrum 512 Extended
Version 1
Other names  
Identifiers PUID:  fmt/1577
Classification Image (Raster)
Description Spectrum 512 was a computer paint program by Boris Tsikanovsky that enabled the creation of images with more than 16 simultaneous colors. It uses the Atari ST's rapid palette switching ability to expand the maximum number of colors to be displayed on-screen at once to 512 (up to 46 in each scan line). Spectrum 512 is a predecessor of Unispec. Spectrum 512 Extended (spx) files are extended Spectrum files with more than 200 lines in the picture, designed by Gizmo of Electronic Images. With a SPX creator like SPXCRT14.PRG multiple spectrum pictures can be attached to become one big .SPX file. There are two known versions of the format. This record details Version 1, both versions support larger pictures in Spectrum 512.
Byte order  
Related file formats Is previous version of Spectrum 512 Extended (2)
Technical Environment  
Supported until  
Format Risk  
Developed by None.
Supported by None.
Source The National Archives and Records Administration / The National Archives and Records Administration
Source date 04 Jan 2022
Source description  
Last updated 04 Jan 2022
Top of page Top of page
The National Archives Newsletter Icon

Send me The National Archives’ newsletter

A monthly round-up of news, blogs, offers and events.