a couple more tweaks...

Syntaxes/EDAsm.sublime-syntax

@@ -23,7 +23,7 @@ contexts:
     - match: '^{{ident}}'
       scope: entity.name.label
 
-    - match: ^[*]|;
+    - match: ^[*;]
       push:
         - meta_scope: comment.line
         - match: \n
@@ -79,16 +79,16 @@ contexts:
   operand-on-off:
     - match: \b(?i:ON|OFF)\b
       scope: constant.language
-    - match: \S
-      scope: invalid.illegal.operand
+      set: expect-comment
+    - include: expect-comment
 
   operand-lst:
     - match: \b(?i:ON|OFF)\b
       scope: constant.language
     - match: \b(?i:NO)?(?i:CYC|GEN|WARN|UNASM|ASYM|VSYM|SIXUP|EXP)\b
       scope: constant.language
-    - match: '[^, \t]'
-      scope: invalid.illegal.operand
+    - match: ','
+    - include: expect-comment
 
   operand-path:
     - match: ([^; \n\t]+)
@@ -106,10 +106,12 @@ contexts:
 
 
   comment:
-    - match: ;[^\n]*
-      scope: comment.line.partial
-    - match: \n
-      pop: true
+    - match: ;
+      push:
+        - meta_scope: comment.line
+        - match: \n
+          pop: true
+    - include: eol
 
   numbers:
     - match: \d+

Syntaxes/Macross.sublime-syntax

@@ -129,15 +129,16 @@ contexts:
 
   string:
     - match: '"'
-      scope: string
+      scope: punctuation.definition.string.begin
       push:
         - meta_include_prototype: false
-        - meta_scope: string
+        - meta_scope: string.quoted.double
         - match: '\n'
           pop: true
           scope: invalid.illegal.newline
         - match: '[^"\n]|\\.'
         - match: '"'
+          scope: punctuation.definition.string.end
           pop: true
 
   comments:

Syntaxes/Merlin.sublime-syntax

@@ -147,8 +147,8 @@ contexts:
   operand-hex:
     - match: '[0-9A-Fa-f]{2}'
       scope: constant.numeric.hex
-    - match: '[^ \t,]'
-      scope: invalid.illegal.operand
+    - match: ','
+    - include: expect-comment
 
 
   operand-path:
@@ -161,8 +161,8 @@ contexts:
     - include: strings
     - match: '[0-9A-Fa-f]{2}'
       scope: constant.numeric.hex
-    - match: '[^ \t,]'
-      scope: invalid.illegal.operand
+    - match: ','
+    - include: expect-comment
     
 
 

Syntaxes/NinjaForce assembler.sublime-syntax

@@ -28,7 +28,7 @@ contexts:
     - match: '^]?{{ident}}'
       scope: entity.name.label
 
-    - match: ^[*]|;
+    - match: ^[*;]
       push:
         - meta_scope: comment.line
         - match: \n
@@ -80,30 +80,42 @@ contexts:
 
   operand-string:
     - include: strings
+    - include: expect-comment
 
-    - match: \S
-      scope: invalid.illegal.operand
 
   operand-hex:
     - match: '[0-9A-Fa-f]{1,2}'
       scope: constant.numeric.hex
-    - match: '[^ \t,]'
-      scope: invalid.illegal.operand
+      set: expect-comment
+    - include: expect-comment
+
 
   operand-on-off:
     - match: \b(?i:ON|OFF)\b
       scope: constant.language
-    - match: \S
-      scope: invalid.illegal.operand
+      set: expect-comment
+    - include: expect-comment
 
 
+  expect-comment:
+    - include: comment
+    - match: \S
+      scope: invalid.illegal.expect.comment
+
   comment:
-    - match: ;[^\n]*
-      scope: comment.line.partial
-    - match: \n
+    - match: ;
+      push:
+        - meta_scope: comment.line
+        - match: \n
+          pop: true
+    - include: eol
+
+  eol:
+    - match: '$'
       pop: true
 
 
+
   mnemonics-65816-alt:
     - match: \b(?i:BLT|BGE)\b
       scope: keyword.mnemonic.65816.alt
@@ -133,8 +145,3 @@ contexts:
         - match: '\n'
           scope: invalid.illegal.newline.asm
           pop: true
-
-
-  eol:
-    - match: '$'
-      pop: true