+/* 1802 connections */
+#define MRD_PORT (&stm_gpiob)
+#define MRD_BIT 15
+
+#define MWR_PORT (&stm_gpioa)
+#define MWR_BIT 3
+
+#define TPB_PORT (&stm_gpioa)
+#define TPB_BIT 7
+
+#define TPA_PORT (&stm_gpioa)
+#define TPA_BIT 6
+
+#define MA_PORT (&stm_gpioe)
+#define MA_SHIFT 0
+#define MA_MASK 0xff
+
+#define BUS_PORT (&stm_gpioe)
+#define BUS_SHIFT 8
+#define BUS_MASK 0xff
+
+#define SC_PORT (&stm_gpiob)
+#define SC_SHIFT 13
+#define SC_MASK 3
+
+#define Q_PORT (&stm_gpiob)
+#define Q_BIT 12
+
+#define N_PORT (&stm_gpiod)
+#define N_SHIFT 13
+#define N_MASK 7
+
+#define EF_PORT (&stm_gpiob)
+#define EF_SHIFT 8
+#define EF_MASK 0xf
+
+#define DMA_IN_PORT (&stm_gpioa)
+#define DMA_IN_BIT 0
+
+#define DMA_OUT_PORT (&stm_gpioa)
+#define DMA_OUT_BIT 9
+
+#define INT_PORT (&stm_gpioa)
+#define INT_BIT 2
+
+#define CLEAR_PORT (&stm_gpioa)
+#define CLEAR_BIT 10
+
+#define WAIT_PORT (&stm_gpioa)
+#define WAIT_BIT 4
+
+#define MUX_PORT (&stm_gpiob)
+#define MUX_BIT 1
+