diff --git a/Intel-Systems/common/iSBC80-20.c b/Intel-Systems/common/iSBC80-20.c
index e116c7f0..26a673cc 100644
--- a/Intel-Systems/common/iSBC80-20.c
+++ b/Intel-Systems/common/iSBC80-20.c
@@ -1,38 +1,38 @@
-/*  iSBC80-20.c: Intel iSBC 80/30 Processor simulator
+/*  iSBC80-20.c: Intel iSBC 80/20 Processor simulator
 
     Copyright (c) 2010, William A. Beech
 
-    Permission is hereby granted, free of charge, to any person obtaining a
-    copy of this software and associated documentation files (the "Software"),
-    to deal in the Software without restriction, including without limitation
-    the rights to use, copy, modify, merge, publish, distribute, sublicense,
-    and/or sell copies of the Software, and to permit persons to whom the
-    Software is furnished to do so, subject to the following conditions:
+        Permission is hereby granted, free of charge, to any person obtaining a
+        copy of this software and associated documentation files (the "Software"),
+        to deal in the Software without restriction, including without limitation
+        the rights to use, copy, modify, merge, publish, distribute, sublicense,
+        and/or sell copies of the Software, and to permit persons to whom the
+        Software is furnished to do so, subject to the following conditions:
 
-    The above copyright notice and this permission notice shall be included in
-    all copies or substantial portions of the Software.
+        The above copyright notice and this permission notice shall be included in
+        all copies or substantial portions of the Software.
 
-    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
-    WILLIAM A. BEECH BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
-    IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
-    CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+        THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+        IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+        FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+        WILLIAM A. BEECH BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+        IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+        CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-    Except as contained in this notice, the name of William A. Beech shall not be
-    used in advertising or otherwise to promote the sale, use or other dealings
-    in this Software without prior written authorization from William A. Beech.
+        Except as contained in this notice, the name of William A. Beech shall not be
+        used in advertising or otherwise to promote the sale, use or other dealings
+        in this Software without prior written authorization from William A. Beech.
 
-    This software was written by Bill Beech, Dec 2010, to allow emulation of Multibus
-    Computer Systems.
+    NOTES:
 
-    ?? ??? 10 - Original file.
+        This software was written by Bill Beech, Dec 2010, to allow emulation of Multibus
+        Computer Systems.
 */
 
 #include "system_defs.h"
 
 /* set the base I/O address for the 8259 */
-#define I8259_BASE              0xD8
+#define I8259_BASE      0xD8
 
 /* set the base I/O address for the first 8255 */
 #define I8255_BASE_0    0xE4
@@ -41,7 +41,7 @@
 #define I8255_BASE_1    0xE8
 
 /* set the base I/O address for the 8251 */
-#define I8251_BASE              0xEC
+#define I8251_BASE      0xEC
 
 /* set the base and size for the EPROM on the iSBC 80/20 */
 #define ROM_SIZE        0x1000
@@ -86,12 +86,12 @@ t_stat SBC_reset (DEVICE *dptr)
 {    
     sim_printf("Initializing iSBC-80/20\n");
     i8080_reset(NULL);
-        i8259_reset(NULL, I8259_BASE);
-        i8255_reset(NULL, I8255_BASE_0);
-        i8255_reset(NULL, I8255_BASE_1);
-        i8251_reset(NULL, I8251_BASE);
-        EPROM_reset(NULL, ROM_SIZE);
-        RAM_reset(NULL, RAM_BASE, RAM_SIZE);
+    i8259_reset(NULL, I8259_BASE);
+    i8255_reset(NULL, I8255_BASE_0);
+    i8255_reset(NULL, I8255_BASE_1);
+    i8251_reset(NULL, I8251_BASE);
+    EPROM_reset(NULL, ROM_SIZE);
+    RAM_reset(NULL, RAM_BASE, RAM_SIZE);
     return SCPE_OK;
 }
 
@@ -102,10 +102,12 @@ int32 get_mbyte(int32 addr)
     int32 val, org, len;
 
     /* if local EPROM handle it */
-    if ((i8255_unit.u6 & 0x01) && (addr >= EPROM_unit.u3) && (addr < (EPROM_unit.u3 + EPROM_unit.capac))) {
+    if ((i8255_unit.u6 & 0x01) &&       /* EPROM enabled? */
+        (addr >= EPROM_unit.u3) && (addr < (EPROM_unit.u3 + EPROM_unit.capac))) {
         return EPROM_get_mbyte(addr);
     } /* if local RAM handle it */
-    if ((i8255_unit.u6 & 0x02) && (addr >= RAM_unit.u3) && (addr < (RAM_unit.u3 + RAM_unit.capac))) {
+    if ((i8255_unit.u6 & 0x02) &&       /* local RAM enabled? */
+        (addr >= RAM_unit.u3) && (addr < (RAM_unit.u3 + RAM_unit.capac))) {
         return RAM_get_mbyte(addr);
     } /* otherwise, try the multibus */
     return multibus_get_mbyte(addr);
@@ -127,11 +129,13 @@ int32 get_mword(int32 addr)
 void put_mbyte(int32 addr, int32 val)
 {
     /* if local EPROM handle it */
-    if ((i8255_unit.u6 & 0x01) && (addr >= EPROM_unit.u3) && (addr <= (EPROM_unit.u3 + EPROM_unit.capac))) {
+    if ((i8255_unit.u6 & 0x01) &&       /* EPROM enabled? */ 
+        (addr >= EPROM_unit.u3) && (addr <= (EPROM_unit.u3 + EPROM_unit.capac))) {
         sim_printf("Write to R/O memory address %04X - ignored\n", addr);
         return;
     } /* if local RAM handle it */
-    if ((i8255_unit.u6 & 0x02) && (addr >= RAM_unit.u3) && (addr <= (RAM_unit.u3 + RAM_unit.capac))) {
+    if ((i8255_unit.u6 & 0x02) &&       /* local RAM enabled? */ 
+        (addr >= RAM_unit.u3) && (addr <= (RAM_unit.u3 + RAM_unit.capac))) {
         RAM_put_mbyte(addr, val);
         return;
     } /* otherwise, try the multibus */
@@ -146,4 +150,4 @@ void put_mword(int32 addr, int32 val)
     put_mbyte(addr+1, val >> 8);
 }
 
-/* end of iSBC80-10.c */
+/* end of iSBC80-20.c */