Emulating the full NTSC stack

" summary

Emulates the full NTSC/PAL video pipeline rather than applying an artistic CRT filter: it models sync discrimination/separation, PLLs for timing, scanline placement and QAM-based color extraction. The implementation splits work between CPU and GPU and is demonstrated on various vintage systems (Atari 2600, ZX80, Apple II, Acorn Electron) to show handling of in-phase hardware, sync errors, software-generated colour and interlaced signals.

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