vsync
void vsync(int);
vsync(WTOP);
vsync(vcline > 0 ? LINE(vcline - 1) : WTOP);
vsync(LINE(vcline));
vsync(WTOP);
vsync(e + 1);
vsync(LASTLINE);
vsync(LINE(vcnt-1));
uint_t vsync; /* vertical sync in scanlines */