Migrating scp and library global variables to be declared as extern in the appropriate library include file and remove repetitive declarations in referencing modules.

H316/h316_cpu.c

@@ -276,12 +276,6 @@ int32 hst_p = 0;                                        /* history pointer */
 int32 hst_lnt = 0;                                      /* history length */
 InstHistory *hst = NULL;                                /* instruction history */
 
-extern int32 sim_int_char;
-extern int32 sim_interval;
-extern uint32 sim_brk_types, sim_brk_dflt, sim_brk_summ; /* breakpoint info */
-extern FILE *sim_log;
-extern DEVICE *sim_devices[];
-
 t_bool devtab_init (void);
 int32 dmaio (int32 inst, int32 fnc, int32 dat, int32 dev);
 int32 undio (int32 inst, int32 fnc, int32 dat, int32 dev);

H316/h316_dp.c

@@ -220,7 +220,6 @@ extern int32 dev_int, dev_enb;
 extern uint32 chan_req;
 extern int32 stop_inst;
 extern uint32 dma_ad[DMA_MAX];
-extern int32 sim_switches;
 
 uint32 dp_cw1 = 0;                                      /* cmd word 1 */
 uint32 dp_cw2 = 0;                                      /* cmd word 2 */

H316/h316_stddev.c

@@ -88,7 +88,6 @@ extern int32 PC;
 extern int32 stop_inst;
 extern int32 C, dp, ext, extoff_pending, sc;
 extern int32 dev_int, dev_enb;
-extern int32 sim_switches;
 extern UNIT cpu_unit;
 
 uint32 ptr_motion = 0;                                  /* read motion */

H316/h316_sys.c

@@ -43,7 +43,6 @@ extern DEVICE fhd_dev;
 extern DEVICE mt_dev;
 extern REG cpu_reg[];
 extern uint16 M[];
-extern int32 sim_switches;
 
 /* SCP data structures and interface routines