+uint8_t
+MRD(void);
+
+void
+MRD_set(uint8_t value);
+
+uint8_t
+MWR(void);
+
+void
+MWR_set(uint8_t value);
+
+uint8_t
+TPA(void);
+
+void
+TPA_set(uint8_t tpa);
+
+uint8_t
+TPB(void);
+
+void
+TPB_set(uint8_t tpb);
+
+uint8_t
+MA(void);
+
+void
+MA_set(uint8_t ma);
+
+/* Tri-state data bus */
+
+uint8_t
+BUS(void);
+
+void
+BUS_set(uint8_t bus);
+
+void
+BUS_stm(void);
+
+void
+BUS_1802(void);
+
+/* Pins controlled by 1802 */
+uint8_t
+SC(void);
+
+uint8_t
+Q(void);
+
+uint8_t
+N(void);
+
+/* Pins controlled by STM */
+uint8_t
+EF(void);
+
+void
+EF_set(uint8_t ef);
+
+uint8_t
+DMA_IN(void);
+
+void
+DMA_IN_set(uint8_t dma_in);
+
+uint8_t
+DMA_OUT(void);
+
+void
+DMA_OUT_set(uint8_t dma_out);
+
+uint8_t
+INT(void);
+
+void
+INT_set(uint8_t dma_out);
+
+uint8_t
+CLEAR(void);
+
+void
+CLEAR_set(uint8_t dma_out);
+
+uint8_t
+WAIT(void);
+
+void
+WAIT_set(uint8_t dma_out);