SSD1306 skips every other line

That doesn't work I'm afraid:

var initCmds = new Uint8Array([ 
             0xAe, // 0 disp off
             0xD5, // 1 clk div
             0x80, // 2 suggested ratio
             0xA8, 0, // 3 set multiplex, height-1
             0xD3,0x0, // 5 display offset
             0x40, // 7 start line
             0x8D, extVcc?0x10:0x14, // 8 charge pump
             0x20,0x0, // 10 memory mode
             0xA1, // 12 seg remap 1
             0xC8, // 13 comscandec
             0xDA, 0x12, // 14 set compins, height==64 ? 0x12:0x02,
             0x81, extVcc?0x9F:0xCF, // 16 set contrast
             0xD9, extVcc?0x22:0xF1, // 18 set precharge
             0xDb, 0x40, // 20 set vcom detect
             0xA4, // 22 display all on
             0xA6, // 23 display normal (non-inverted)
             0xAf // 24 disp on
            ]);

Line 5 should be the height-1 and line 12 is hardcoded to 0x12 (should be 0x02 for 32 lines) .

// commands sent when sending data to the display
var flipCmds = [
     0x21, // columns
     0, C.OLED_WIDTH-1,
     0x22, // pages
     0, 7];

Line 6 should be 3 for 32 lines and 7 for 64.

exports.connectSPI = function(spi, dc,  rst, callback, options) {
  update(options);
  var cs = options?options.cs:undefined;
  var oled = Graphics.createArrayBuffer(C.OLED_WIDTH,C.OLED_HEIGHT,1,{vertical_byte : true});

This code does not take into account a height set in the options.