diff --git a/RunCPM/abstraction_arduino.h b/RunCPM/abstraction_arduino.h
index fc2bd43..2d46f3d 100644
--- a/RunCPM/abstraction_arduino.h
+++ b/RunCPM/abstraction_arduino.h
@@ -33,7 +33,7 @@ bool _RamLoad(char* filename, uint16 address) {
 	return(result);
 }
 
-/* Filesystem (disk) abstraction fuctions */
+/* Filesystem (disk) abstraction functions */
 /*===============================================================================*/
 File rootdir, userdir;
 #define FOLDERCHAR '/'
diff --git a/RunCPM/abstraction_posix.h b/RunCPM/abstraction_posix.h
index f3cbf2e..69cb3ce 100644
--- a/RunCPM/abstraction_posix.h
+++ b/RunCPM/abstraction_posix.h
@@ -49,7 +49,7 @@ void _RamLoad(uint8* filename, uint16 address) {
 	_sys_fclose(file);
 }
 
-/* Filesystem (disk) abstraction fuctions */
+/* Filesystem (disk) abstraction functions */
 /*===============================================================================*/
 #define FOLDERCHAR '/'
 
diff --git a/RunCPM/abstraction_vstudio.h b/RunCPM/abstraction_vstudio.h
index e59bbb9..cd869d4 100644
--- a/RunCPM/abstraction_vstudio.h
+++ b/RunCPM/abstraction_vstudio.h
@@ -46,7 +46,7 @@ void _RamLoad(uint8* filename, uint16 address) {
 	_sys_fclose(file);
 }
 
-/* Filesystem (disk) abstraction fuctions */
+/* Filesystem (disk) abstraction functions */
 /*===============================================================================*/
 WIN32_FIND_DATA FindFileData;
 HANDLE hFind;
diff --git a/RunCPM/cpm.h b/RunCPM/cpm.h
index fb24a10..ab8fb69 100644
--- a/RunCPM/cpm.h
+++ b/RunCPM/cpm.h
@@ -195,7 +195,7 @@ void _PatchCPM(void) {
 		_RamWrite(	BIOSpage + i + 1,	0xFF);
 		_RamWrite(	BIOSpage + i + 2,	RET);
 	}
-	// **********  Patch CP/M (fake) Disk Paramater Block after the BDOS call entry  **********
+	// **********  Patch CP/M (fake) Disk Parameter Block after the BDOS call entry  **********
 	i = DPBaddr;
 	_RamWrite(	i++,	64);    // spt - Sectors Per Track
 	_RamWrite(	i++,	0);
@@ -1418,7 +1418,7 @@ void _Bdos(void) {
 		}
 
 		/* 
-		   ToDo: C = 48 (30h) : Flush Bufers (CPM3)
+		   ToDo: C = 48 (30h) : Flush Buffers (CPM3)
 		   E = Purge flag
 		   Returns: A = return code
 		   	    H = Physical Error
@@ -1557,7 +1557,7 @@ void _Bdos(void) {
 
 		/* 
 		   ToDo: C = 106 (6Ah) : Set Default Password (CPM3)
-		   DE = Password Addresss
+		   DE = Password Address
 		   Returns: None
 		 */
 		case F_PASSWD: {
diff --git a/RunCPM/lua/lauxlib.c b/RunCPM/lua/lauxlib.c
index 8ed1da1..30338d9 100644
--- a/RunCPM/lua/lauxlib.c
+++ b/RunCPM/lua/lauxlib.c
@@ -611,7 +611,7 @@ LUALIB_API void luaL_pushresultsize (luaL_Buffer *B, size_t sz) {
 ** box (if existent) is not on the top of the stack. So, instead of
 ** calling 'luaL_addlstring', it replicates the code using -2 as the
 ** last argument to 'prepbuffsize', signaling that the box is (or will
-** be) bellow the string being added to the buffer. (Box creation can
+** be) below the string being added to the buffer. (Box creation can
 ** trigger an emergency GC, so we should not remove the string from the
 ** stack before we have the space guaranteed.)
 */
diff --git a/RunCPM/lua/lfunc.c b/RunCPM/lua/lfunc.c
index f5889a2..a38c5c5 100644
--- a/RunCPM/lua/lfunc.c
+++ b/RunCPM/lua/lfunc.c
@@ -209,7 +209,7 @@ void luaF_closeupval (lua_State *L, StkId level) {
 
 
 /*
-** Remove firt element from the tbclist plus its dummy nodes.
+** Remove first element from the tbclist plus its dummy nodes.
 */
 static void poptbclist (lua_State *L) {
   StkId tbc = L->tbclist;
diff --git a/RunCPM/main.c b/RunCPM/main.c
index dbb120a..46554a1 100644
--- a/RunCPM/main.c
+++ b/RunCPM/main.c
@@ -23,7 +23,7 @@
 /*
 abstraction.h - Adds all system dependent calls and definitions needed by RunCPM
 This should be the only file modified for portability. Any other file
-shoud be kept the same.
+should be kept the same.
 */
 
 #ifdef _WIN32