 #define B   A1
 #define C   A2
 #define D   A3
+// 5-bit address bus support
+//#define E   A5
 
 // Button input
 #define CLOCK 11

        *addrdport |= addrdpin;
    else
        *addrdport &= ~addrdpin;

    *latport |= latpin;
    *latport &= ~latpin;

        {
            if (spr & mask)
            {
                game_render_buf[xx + ((ry & ADDR_HIGH) << ADDR_SHIFT)] = color;
            }
        }
        mask >>= 1;
