垂直 すいちょく同期 どうき信号 しんごうじゃなかったです
suichokudōkishingōjanakattadesu

Noun
Desu Copula

The polite, past negative form of 垂直同期信号

1. Wasn't a vertical sync signal.; Wasn't the vertical sync signal.

Past/Perfective
Negative
Polite
Casual Register
Computing