Speccy is a Sinclair ZX Spectrum home computer emulator, but also emulates a Sam Coupe. It will run software written for Spectrum 16k, 48k, 128k, +2, +2A, +3, Timex Sinclair, Pentagon, and Skorpion home computers.

Changes:

* Released free Speccy 4.2 for Windows and Linux.
* Added HQ4X scaling (only in “Accelerated Video” mode).
* Select “Video | Interpolation Effect | HQ4X” to enable.
* Disabled GLES linear filtering when scaling algorithm selected.
* Now sampling from the middle of each pixel in GLES scalers.
* Further optimized GLES scaling algorithms.
* Added “Video | Scale Video | Stretch to 4:3 Ratio” option.

https://play.google.com/store/apps/details?id=com.fms.speccy