diff --git a/PDP18B/pdp18b_defs.h b/PDP18B/pdp18b_defs.h
index 10903f3f..e04bdb3f 100644
--- a/PDP18B/pdp18b_defs.h
+++ b/PDP18B/pdp18b_defs.h
@@ -111,7 +111,7 @@
                                         TC59D magnetic tape
                                         TC15/TU56 DECtape
                                         LT15/LT19 additional Teletypes
-					DR15C parallel interface to UC15
+                                        DR15C parallel interface to UC15
 
    ??Indicates not implemented.  The PDP-4 manual refers to a memory
    ??extension control; there is no documentation on it.
diff --git a/PDP8/pdp8_ttx.c b/PDP8/pdp8_ttx.c
index b9248dbd..fa29c6bf 100644
--- a/PDP8/pdp8_ttx.c
+++ b/PDP8/pdp8_ttx.c
@@ -77,7 +77,7 @@ uint8 ttix_buf[TTX_MAXL] = { 0 };                       /* input buffers */
 uint8 ttox_buf[TTX_MAXL] = { 0 };                       /* output buffers */
 TMLN ttx_ldsc[TTX_MAXL] = { {0} };                      /* line descriptors */
 TMXR ttx_desc = { TTX_INIL, 0, 0, ttx_ldsc };           /* mux descriptor */
-#define ttx_lines	ttx_desc.lines
+#define ttx_lines       ttx_desc.lines
 
 int32 ttix (int32 IR, int32 AC);
 int32 ttox (int32 IR, int32 AC);
diff --git a/alpha/alpha_cpu.c b/alpha/alpha_cpu.c
index 6f10f635..783dbc5e 100644
--- a/alpha/alpha_cpu.c
+++ b/alpha/alpha_cpu.c
@@ -27,7 +27,7 @@
    27-May-2017  RMS     Fixed MIN/MAXx4 iteration counts (Mark Pizzolato)
    26-May-2017  RMS     Fixed other reversed definitions in opcode 12
    28-Apr-2017  RMS     Fixed reversed definitions of INSQH, EXTQH (Maurice Marks)
-  	
+
    Alpha architecturally-defined CPU state:
 
    PC<63:0>                     program counter
diff --git a/sigma/sigma_dp.c b/sigma/sigma_dp.c
index 362c1e25..1a3a4187 100644
--- a/sigma/sigma_dp.c
+++ b/sigma/sigma_dp.c
@@ -158,14 +158,14 @@
    type         #sectors/       #surfaces/      #cylinders/
                  surface         cylinder        drive
 
-   7242         6               20              203		    =24MB
-   7261         11              20              203		    =45MB
-   7271         6               20              406		    =48MB
+   7242         6               20              203         =24MB
+   7261         11              20              203         =45MB
+   7271         6               20              406         =48MB
    3288         17              5               822         =67MB
    7276         11              19              411         =86MB
    7266         11              20              411         =90MB
-   3282         11              19              815		    =170MB
-   3283         17              19              815		    =263MB
+   3282         11              19              815         =170MB
+   3283         17              19              815         =263MB
 
    On the T3281, each drive can be a different type.  The size field
    in each unit selects the drive capacity for each drive and thus