diff --git a/source/qb64pe.bas b/source/qb64pe.bas
index e889336ef..94ad7475c 100644
--- a/source/qb64pe.bas
+++ b/source/qb64pe.bas
@@ -1171,6 +1171,9 @@ HashAdd "AND", f, 0
 HashAdd "OR", f, 0
 HashAdd "XOR", f, 0
 HashAdd "MOD", f, 0
+HashAdd "_NEGATE", f, 0
+HashAdd "_ANDALSO", f, 0
+HashAdd "_ORELSE", f, 0
 
 f = HASHFLAG_RESERVED + HASHFLAG_CUSTOMSYNTAX
 HashAdd "LIST", f, 0
@@ -1548,6 +1551,11 @@ IF qb64prefix_set THEN
 
     f = HASHFLAG_RESERVED + HASHFLAG_CUSTOMSYNTAX
     HashAdd "EXPLICIT", f, 0
+
+    f = HASHFLAG_OPERATOR + HASHFLAG_RESERVED
+    HashAdd "NEGATE", f, 0
+    HashAdd "ANDALSO", f, 0
+    HashAdd "ORELSE", f, 0
 END IF
 
 DIM SHARED GlobTxtBuf: GlobTxtBuf = OpenBuffer%("O", tmpdir$ + "global.txt")
@@ -18828,6 +18836,12 @@ FUNCTION fixoperationorder$ (savea$)
             IF temp1$ = "XOR" AND temp2$ = "XOR" THEN Give_Error "Error: XOR XOR": EXIT FUNCTION
             IF temp1$ = "IMP" AND temp2$ = "IMP" THEN Give_Error "Error: IMP IMP": EXIT FUNCTION
             IF temp1$ = "EQV" AND temp2$ = "EQV" THEN Give_Error "Error: EQV EQV": EXIT FUNCTION
+            IF temp1$ = "_ANDALSO" AND temp2$ = "_ANDALSO" THEN Give_Error "Error: _ANDALSO _ANDALSO": EXIT FUNCTION
+            IF temp1$ = "_ORELSE" AND temp2$ = "_ORELSE" THEN Give_Error "Error: _ORELSE _ORELSE": EXIT FUNCTION
+            IF qb64prefix_set THEN
+                IF temp1$ = "ANDALSO" AND temp2$ = "ANDALSO" THEN Give_Error "Error: ANDALSO ANDALSO": EXIT FUNCTION
+                IF temp1$ = "ORELSE" AND temp2$ = "ORELSE" THEN Give_Error "Error: ORELSE ORELSE": EXIT FUNCTION
+            END IF
         NEXT
 
         '----------------A. 'Quick' mismatched brackets check----------------
@@ -19784,11 +19798,14 @@ END SUB
 FUNCTION isoperator (a2$)
     a$ = UCASE$(a2$)
     l = 0
+    l = l + 1: IF a$ = "_ORELSE" OR (qb64prefix_set AND a$ = "ORELSE") THEN GOTO opfound
+    l = l + 1: IF a$ = "_ANDALSO" OR (qb64prefix_set AND a$ = "ANDALSO") THEN GOTO opfound
     l = l + 1: IF a$ = "IMP" THEN GOTO opfound
     l = l + 1: IF a$ = "EQV" THEN GOTO opfound
     l = l + 1: IF a$ = "XOR" THEN GOTO opfound
     l = l + 1: IF a$ = "OR" THEN GOTO opfound
     l = l + 1: IF a$ = "AND" THEN GOTO opfound
+    l = l + 1: IF a$ = "_NEGATE" OR (qb64prefix_set AND a$ = "NEGATE") THEN GOTO opfound
     l = l + 1: IF a$ = "NOT" THEN GOTO opfound
     l = l + 1
     IF a$ = "=" THEN GOTO opfound
@@ -20883,9 +20900,12 @@ FUNCTION operatorusage (operator$, typ AS LONG, info$, lhs AS LONG, rhs AS LONG,
     IF operator$ = "XOR" THEN info$ = "^": operatorusage = 1: EXIT FUNCTION
     IF operator$ = "OR" THEN info$ = "|": operatorusage = 1: EXIT FUNCTION
     IF operator$ = "AND" THEN info$ = "&": operatorusage = 1: EXIT FUNCTION
+    IF operator$ = "_ORELSE" OR (qb64prefix_set AND operator$ = "ORELSE") THEN info$ = "||": operatorusage = 3: EXIT FUNCTION
+    IF operator$ = "_ANDALSO" OR (qb64prefix_set AND operator$ = "ANDALSO") THEN info$ = "&&": operatorusage = 3: EXIT FUNCTION
 
     lhs = 7
     IF operator$ = "NOT" THEN info$ = "~": operatorusage = 5: EXIT FUNCTION
+    IF operator$ = "_NEGATE" OR (qb64prefix_set AND operator$ = "NEGATE") THEN info$ = "!": operatorusage = 5: EXIT FUNCTION
 
     IF Debug THEN PRINT #9, "INVALID NUMBERIC OPERATOR!": END
 
@@ -23681,27 +23701,43 @@ FUNCTION SCase2$ (t$)
     IF ideautolayoutkwcapitals THEN
         SCase2$ = UCASE$(t$)
     ELSE
-        newWord = -1
-        temp$ = ""
-        FOR i = 1 TO LEN(t$)
-            s$ = MID$(t$, i, 1)
-            IF newWord THEN
-                IF s$ = "_" OR s$ = separator$ THEN
-                    temp$ = temp$ + s$
-                ELSE
-                    temp$ = temp$ + UCASE$(s$)
-                    newWord = 0
-                END IF
-            ELSE
-                IF s$ = separator$ THEN
-                    temp$ = temp$ + separator$
-                    newWord = -1
-                ELSE
-                    temp$ = temp$ + LCASE$(s$)
-                END IF
-            END IF
-        NEXT
-        SCase2$ = temp$
+        SELECT CASE t$
+            CASE "_ANDALSO"
+                SCase2$ = "_AndAlso"
+
+            CASE "ANDALSO"
+                SCase2$ = "AndAlso"
+
+            CASE "_ORELSE"
+                SCase2$ = "_OrElse"
+
+            CASE "ORELSE"
+                SCase2$ = "OrElse"
+
+            CASE ELSE
+                newWord = -1
+                temp$ = ""
+                FOR i = 1 TO LEN(t$)
+                    s$ = MID$(t$, i, 1)
+                    IF newWord THEN
+                        IF s$ = "_" OR s$ = separator$ THEN
+                            temp$ = temp$ + s$
+                        ELSE
+                            temp$ = temp$ + UCASE$(s$)
+                            newWord = 0
+                        END IF
+                    ELSE
+                        IF s$ = separator$ THEN
+                            temp$ = temp$ + separator$
+                            newWord = -1
+                        ELSE
+                            temp$ = temp$ + LCASE$(s$)
+                        END IF
+                    END IF
+                NEXT
+                SCase2$ = temp$
+
+        END SELECT
     END IF
 END FUNCTION
 
diff --git a/source/subs_functions/syntax_highlighter_list.bas b/source/subs_functions/syntax_highlighter_list.bas
index 19cc5f853..fa16146e2 100644
--- a/source/subs_functions/syntax_highlighter_list.bas
+++ b/source/subs_functions/syntax_highlighter_list.bas
@@ -5,5 +5,5 @@ listOfKeywords$ = listOfKeywords$ + "_GLCOPYTEXSUBIMAGE2D@_GLCULLFACE@_GLDELETEL
 listOfKeywords$ = listOfKeywords$ + "_GLPOPATTRIB@_GLPOPCLIENTATTRIB@_GLPOPMATRIX@_GLPOPNAME@_GLPRIORITIZETEXTURES@_GLPUSHATTRIB@_GLPUSHCLIENTATTRIB@_GLPUSHMATRIX@_GLPUSHNAME@_GLRASTERPOS2D@_GLRASTERPOS2DV@_GLRASTERPOS2F@_GLRASTERPOS2FV@_GLRASTERPOS2I@_GLRASTERPOS2IV@_GLRASTERPOS2S@_GLRASTERPOS2SV@_GLRASTERPOS3D@_GLRASTERPOS3DV@_GLRASTERPOS3F@_GLRASTERPOS3FV@_GLRASTERPOS3I@_GLRASTERPOS3IV@_GLRASTERPOS3S@_GLRASTERPOS3SV@_GLRASTERPOS4D@_GLRASTERPOS4DV@_GLRASTERPOS4F@_GLRASTERPOS4FV@_GLRASTERPOS4I@_GLRASTERPOS4IV@_GLRASTERPOS4S@_GLRASTERPOS4SV@_GLREADBUFFER@_GLREADPIXELS@_GLRECTD@_GLRECTDV@_GLRECTF@_GLRECTFV@_GLRECTI@_GLRECTIV@_GLRECTS@_GLRECTSV@_GLRENDERMODE@_GLROTATED@_GLROTATEF@_GLSCALED@_GLSCALEF@_GLSCISSOR@_GLSELECTBUFFER@_GLSHADEMODEL@_GLSTENCILFUNC@_GLSTENCILMASK@_GLSTENCILOP@_GLTEXCOORD1D@_GLTEXCOORD1DV@_GLTEXCOORD1F@_GLTEXCOORD1FV@_GLTEXCOORD1I@_GLTEXCOORD1IV@_GLTEXCOORD1S@_GLTEXCOORD1SV@_GLTEXCOORD2D@_GLTEXCOORD2DV@_GLTEXCOORD2F@_GLTEXCOORD2FV@_GLTEXCOORD2I@_GLTEXCOORD2IV@_GLTEXCOORD2S@_GLTEXCOORD2SV@_GLTEXCOORD3D@_GLTEXCOORD3DV@_GLTEXCOORD3F@_GLTEXCOORD3FV@_GLTEXCOORD3I@_GLTEXCOORD3IV@_GLTEXCOORD3S@_GLTEXCOORD3SV@_GLTEXCOORD4D@_GLTEXCOORD4DV@_GLTEXCOORD4F@_GLTEXCOORD4FV@_GLTEXCOORD4I@_GLTEXCOORD4IV@_GLTEXCOORD4S@_GLTEXCOORD4SV@_GLTEXCOORDPOINTER@_GLTEXENVF@_GLTEXENVFV@_GLTEXENVI@_GLTEXENVIV@_GLTEXGEND@_GLTEXGENDV@_GLTEXGENF@_GLTEXGENFV@_GLTEXGENI@_GLTEXGENIV@_GLTEXIMAGE1D@_GLTEXIMAGE2D@_GLTEXPARAMETERF@_GLTEXPARAMETERFV@_GLTEXPARAMETERI@_GLTEXPARAMETERIV@_GLTEXSUBIMAGE1D@_GLTEXSUBIMAGE2D@_GLTRANSLATED@_GLTRANSLATEF@_GLVERTEX2D@_GLVERTEX2DV@_GLVERTEX2F@_GLVERTEX2FV@_GLVERTEX2I@_GLVERTEX2IV@_GLVERTEX2S@_GLVERTEX2SV@_GLVERTEX3D@_GLVERTEX3DV@_GLVERTEX3F@_GLVERTEX3FV@_GLVERTEX3I@_GLVERTEX3IV@_GLVERTEX3S@_GLVERTEX3SV@_GLVERTEX4D@_GLVERTEX4DV@_GLVERTEX4F@_GLVERTEX4FV@_GLVERTEX4I@_GLVERTEX4IV@_GLVERTEX4S@_GLVERTEX4SV@_GLVERTEXPOINTER@_GLVIEWPORT@SMOOTH@STRETCH@_ANTICLOCKWISE@_BEHIND@_CLEAR@_FILLBACKGROUND@_GLUPERSPECTIVE@_HARDWARE@_HARDWARE1@_KEEPBACKGROUND@_NONE@_OFF@_ONLY@_ONLYBACKGROUND@_ONTOP@_SEAMLESS@_SMOOTH@_SMOOTHSHRUNK@_SMOOTHSTRETCHED@"
 listOfKeywords$ = listOfKeywords$ + "_SOFTWARE@_SQUAREPIXELS@_STRETCH@_ALLOWFULLSCREEN@_ALL@_ECHO@_READFILE$@_WRITEFILE@_INSTRREV@_TRIM$@_ACCEPTFILEDROP@_FINISHDROP@_TOTALDROPPEDFILES@_DROPPEDFILE@_DROPPEDFILE$@_SHR@_SHL@_ROR@_ROL@"
 listOfKeywords$ = listOfKeywords$ + "_ADLER32@_CRC32@_MD5$@_DEFLATE$@_INFLATE$@_READBIT@_RESETBIT@_SETBIT@_TOGGLEBIT@$INCLUDEONCE@$ASSERTS@CONSOLE@_ASSERT@_CAPSLOCK@_NUMLOCK@_SCROLLLOCK@_TOGGLE@_CONSOLEFONT@_CONSOLECURSOR@_CONSOLEINPUT@_CINP@$NOPREFIX@$COLOR@$DEBUG@$EMBED@_EMBEDDED$@_ENVIRONCOUNT@$UNSTABLE@$MIDISOUNDFONT@"
-listOfKeywords$ = listOfKeywords$ + "_NOTIFYPOPUP@_MESSAGEBOX@_INPUTBOX$@_SELECTFOLDERDIALOG$@_COLORCHOOSERDIALOG@_OPENFILEDIALOG$@_SAVEFILEDIALOG$@_SAVEIMAGE@_FILES$@_FULLPATH$@"
+listOfKeywords$ = listOfKeywords$ + "_NOTIFYPOPUP@_MESSAGEBOX@_INPUTBOX$@_SELECTFOLDERDIALOG$@_COLORCHOOSERDIALOG@_OPENFILEDIALOG$@_SAVEFILEDIALOG$@_SAVEIMAGE@_FILES$@_FULLPATH$@_NEGATE@_ANDALSO@_ORELSE@"
 listOfKeywords$ = listOfKeywords$ + "_STATUSCODE@_SNDNEW@_SCALEDWIDTH@_SCALEDHEIGHT@_UFONTHEIGHT@_UPRINTWIDTH@_ULINESPACING@_UPRINTSTRING@_UCHARPOS@"
diff --git a/tests/compile_tests/bool_test/bool_test.bas b/tests/compile_tests/bool_test/bool_test.bas
new file mode 100644
index 000000000..39879211d
--- /dev/null
+++ b/tests/compile_tests/bool_test/bool_test.bas
@@ -0,0 +1,65 @@
+$CONSOLE:ONLY
+_DEFINE A-Z AS LONG
+OPTION _EXPLICIT
+
+CONST A = -100
+CONST B = -10
+CONST D = 10
+CONST E = 100
+
+DIM c AS LONG
+
+PRINT "Logical op test:"
+PRINT
+
+c = _NEGATE (_NEGATE (_NEGATE (_NEGATE c)))
+
+IF _NEGATE GetValue(c) THEN
+    PRINT "_NEGATE: Test passed."
+ELSE
+    PRINT "_NEGATE: Test failed."
+END IF
+
+IF GetValue(D) < 0 _ANDALSO GetValue(E) < 0 THEN
+    PRINT "_ANDALSO: Test failed."
+ELSE
+    PRINT "_ANDALSO: Test passed."
+END IF
+
+IF GetValue(A) < 0 _ORELSE GetValue(B) < 0 THEN
+    PRINT "_ORELSE: Test passed."
+ELSE
+    PRINT "_ORELSE: Test failed."
+END IF
+
+
+PRINT
+PRINT "Bitwise op test:"
+PRINT
+
+c = NOT (NOT (NOT (NOT c)))
+
+IF NOT GetValue(c) THEN
+    PRINT "NOT: Test passed."
+ELSE
+    PRINT "NOT: Test failed."
+END IF
+
+IF GetValue(D) < 0 AND GetValue(E) < 0 THEN
+    PRINT "AND: Test failed."
+ELSE
+    PRINT "AND: Test passed."
+END IF
+
+IF GetValue(A) < 0 OR GetValue(B) < 0 THEN
+    PRINT "OR: Test passed."
+ELSE
+    PRINT "OR: Test failed."
+END IF
+
+SYSTEM
+
+FUNCTION GetValue& (x AS LONG)
+    PRINT "Function called for value:"; x
+    GetValue = x
+END FUNCTION
diff --git a/tests/compile_tests/bool_test/bool_test.output b/tests/compile_tests/bool_test/bool_test.output
new file mode 100644
index 000000000..ef1e1be08
--- /dev/null
+++ b/tests/compile_tests/bool_test/bool_test.output
@@ -0,0 +1,19 @@
+Logical op test:
+
+Function called for value: 0 
+_NEGATE: Test passed.
+Function called for value: 10 
+_ANDALSO: Test passed.
+Function called for value:-100 
+_ORELSE: Test passed.
+
+Bitwise op test:
+
+Function called for value: 0 
+NOT: Test passed.
+Function called for value: 10 
+Function called for value: 100 
+AND: Test passed.
+Function called for value:-100 
+Function called for value:-10 
+OR: Test passed.