             den = byte & 0x10 != 0
             bmm = byte & 0x20 != 0
             ecm = byte & 0x40 != 0
+        case 0x15:
+            me = byte
         case 0x16:
             mcm = byte & 0x10 != 0
         case 0x18:

    private var graphicsSequencerShiftRegister: UInt8 = 0
    private var graphicsSequencerVideoMatrix: UInt8 = 0
    private var graphicsSequencerColorLine: UInt8 = 0
    //MARK: -
    
    //MARK: Bus

            return yScroll | (den ? 0x10 : 0) | (bmm ? 0x20 : 0) | (ecm ? 0x40 : 0) | UInt8((raster & 0x100) >> 1)
        case 0x12:
            return UInt8(truncatingBitPattern: raster)
        case 0x15:
            return me
        case 0x16:
            return (mcm ? 0x10 : 0) //TODO: missing bit registers
        case 0x19:
