Convert sps to dds Online: sps2dds
You can use Tom's Editor to easily convert images from
Spectrum 512 (smooshed) .SPS to Direct Show Surface
Tom's Editor is a free, online image manipulation and converter program.
Go to Tom's Editor
Spectrum 512 (smooshed) is an image format with extension SPS.
DDS are files invented by Microsoft to be used in games, mostly as textures. Images can be compressed to save space but the compression methods defined by DDS are all very fast in terms of coding and decoding.