For TR-DOS, it's worth knowing that the.This new interrupt is generated at any selected screen line.Jun 08, 2018

The ZX-Uno expands on this and allows activating what is called a “raster interrupt”. This has often been used to make various graphic effects. It accurately emulates Spectrum 48k, 128k, +2/+2A/+3, and Pentagon, and supports SNA/Z80/SZX snapshots, TAP/TZX/PZX tape files, TRD/SCL/DSK disk files and RZX replay files.The ZX Spectrum generates an interrupt with a frequency of 50Hz that is synchronized with the vertical retrace of the screen.

ZXDS is an emulator of Sinclair ZX Spectrum for Nintendo DS and 3DS, written by Patrik Rak.