HLR

HLR is a graphics format for the ZX Spectrum. It's also known as a "Attributes Gigascreen" image.

Identification
files are exactly 1628 bytes long

Software

 * RECOIL

Sample files

 * https://telparia.com/fileFormatSamples/image/hlr/

Links

 * Wikipedia - ZX Spectrum graphic modes - GigaScreen