Fix UTF-8 encoding for four files

HP2100/hp2100_cpu5.c

@@ -1676,7 +1676,7 @@ if (xidex) {                                            /* is EMA declared? */
     }
 }                                                       /* not EMA reference */
 ndim = ReadW(dtbl++);
-if (ndim<0) goto em15;                                  /* negative ´dimensions */
+if (ndim<0) goto em15;                                  /* negative dimensions */
 sum = 0;                                                /* accu for index calc */
 while (ndim > 0) {
     MR = ReadW (atbl++);                                /* fetch address of A(N) */

I650/i650_cpu.c

@@ -22,7 +22,7 @@
    cpu          IBM 650 central processor
 
    From Wikipedia: The IBM 650 Magnetic Drum Data-Processing Machine is one of
-   IBM's early computers, and the world’s first mass-produced computer. It was
+   IBM's early computers, and the world’s first mass-produced computer. It was
    announced in 1953 and in 1956 enhanced as the IBM 650 RAMAC with the
    addition of up to four disk storage units. Almost 2,000 systems were
    produced, the last in 1962.

Ibm1130/ibm1130_sca.c

@@ -680,7 +680,7 @@ static t_stat sca_svc (UNIT *uptr)
 
     if (sca_dsw & SCA_DSW_READY) {              /* if connected */
 
-        /* if rcvd data buffer is empty, and if in one of the receive states, checÄk for arrival of received data */
+        /* if rcvd data buffer is empty, and if in one of the receive states, check for arrival of received data */
         if (in_receive_state() && sca_rcvptr >= sca_nrcvd)
             sca_check_indata();
 

PDP10/pdp10_tim.c

@@ -335,7 +335,7 @@ int32 old_tick_in_usecs = tick_in_usecs;
  * time base. This allows a maximum interval of 223 ms, which is almost 140
  * minutes. At the end of each interval, the :microcode sets Interval Done
  * (RDAPR bit 30), requesting an interrupt on the level assigned to the system
- * flags (§4.8). In a separate workspace register, the microcode starts with
+ * flags (§4.8). In a separate workspace register, the microcode starts with
  * the given period, decrements it by 4096 (2**12) every time the millisecond
  * counter overflows, and sets the flag when the contents of this "time to go"
  * register reach zero or less. Hence the countdown is by milliseconds, and