VertStretch
tmp = (read3CE(par, VertStretch) >> 4) & 3;
write3CE(par, VertStretch, (read3CE(par, VertStretch) & 0x7C) | 1);
write3CE(par, VertStretch, (read3CE(par, VertStretch) & 0x7C) | 0x80);