SSD1306 skips every other line

ahh...yes... I thought I must have missed something crucial! :)

function update(options) {
  if (options && options.height) {
    initCmds[4] = options.height-1;
    initCmds[15] = options.height==64 ? 0x12 : 0x02;
    flipCmds[5] = (options.height>>3)-1;
  }
}

Line 3 should be:

initCmds[3] = options.height-1;

...and won't that break backwards-compatibility? I think if no options are set you should create one and default in options.height = 64.