This new interrupt is generated at any selected screen line.ZX Spectrum fans continued on this development which resulted in the design that is now known as the ‘Harlequin Superfo’, with 128K versions like the Harlequin rev 2D. 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. ![]() ![]() The ZX Spectrum generates an interrupt with a frequency of 50Hz that is synchronized with the vertical retrace of the screen.
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