Comment by pezezin

You guys are ignoring the horizontal and vertical blanking periods, which were usually 25~35% of the active horizontal period and 8~10% of the active vertical period. I could find these two links that explain that the actual signal sent to the CRT was around 704x370 pixels:

https://nerdhut.de/2016/06/26/macintosh-classic-crt-1/

https://bobparadiso.com/wp-content/uploads/2014/09/timing.pn...