diff --git a/src/apicode.a b/src/apicode.a
index 027f04c..f42adc4 100644
--- a/src/apicode.a
+++ b/src/apicode.a
@@ -83,10 +83,6 @@ FIRSTFILTER
          !byte FALSE      ; 0=true, 1=false
                           ; reset before each operation
                           ; set in IDVolumeName() after identifying ProDOS bootloader
-;gPossibleSigCheck
-         !byte FALSE      ; 0=true, 1=false
-                          ; reset before each operation
-                          ; set in IsWideTrack() after finding extra wide protection track
 ;gPossibleB4BBBasic
          !byte FALSE      ; 0=true, 1=false
                           ; reset before each operation
diff --git a/src/apidefs.a b/src/apidefs.a
index cd2ae43..dbc9ebc 100644
--- a/src/apidefs.a
+++ b/src/apidefs.a
@@ -182,8 +182,7 @@ gIsTSR                        = gIsDiversi-$01                        ; byte
 gPossibleMECCSwapper          = gIsTSR-$01                            ; byte
 gPossibleWoodbury             = gPossibleMECCSwapper-$01              ; byte
 gPossibleB4BBBasic            = gPossibleWoodbury-$01                 ; byte
-gPossibleSigCheck             = gPossibleB4BBBasic-$01                ; byte
-gIsLowDOS                     = gPossibleSigCheck-$01                 ; byte
+gIsLowDOS                     = gPossibleB4BBBasic-$01                ; byte
 ;LASTFILTER ; add new gIs* above this line
 ;gIsInfocom18 is a special case whose ID is not in the regular inspection path
 gIsInfocom18                  = gIsLowDOS-$01                         ; byte
diff --git a/src/patchers/sigcheck.a b/src/patchers/sigcheck.a
index cc598e8..30cc6ac 100644
--- a/src/patchers/sigcheck.a
+++ b/src/patchers/sigcheck.a
@@ -3,22 +3,25 @@
 ; productized extra wide track protection check
 ;
 ; tested on
-; - Advanced Electricity
-; - Complex Circuits
-; - Projectile and Circular Motion
+; - Advanced Electricity (EME)
+; - Complex Circuits (EME)
+; - Projectile and Circular Motion (EME)
+; - Inca (Hayden)
+; - Holy Grail (Hayden)
+; - The Dam Busters (Accolade)
+; - Conjecture (Robert Scott)
+; - Solo Flight (MicroProse)
 ;-------------------------------
-         lda   gPossibleSigCheck
+         lda   gIsBoot0
          bne   +
-         ldy   #$0A
+         ldy   #$06
          jsr   SearchTrack
-         !byte $4C,$42,$61
-         !byte $A9,$00
-         !byte $F0,$02
-         !byte $A9,$FF
+         !byte $18        ; CLC
+         !byte $B0,$7E    ; BCS +
+         !byte $A5,$00    ; LDA $00
          !byte $48
          bcs   +          ; passport-test-suite/Advanced Electricity.woz [C=0] matches
-         jsr   inx8
-         jsr   modify1
-         !byte $00
+         jsr   modify3
+         !byte $A9,$00    ; LDA #$00
+         !byte $60        ; RTS
 +
-
diff --git a/src/patchers/t00_sigcheck.a b/src/patchers/t00_sigcheck.a
index e714256..619a93a 100644
--- a/src/patchers/t00_sigcheck.a
+++ b/src/patchers/t00_sigcheck.a
@@ -3,26 +3,19 @@
 ; productized extra wide track protection check
 ;
 ; tested on
-; - Hardball
+; - Hardball (Accolade)
+; - Law of the West (Accolade)
 ;-------------------------------
          ; gTrack = 0
 
-         ldy   #$0A
+         ldy   #$06
          jsr   SearchTrack
-         !byte $4C,$42,$61
-         !byte $A9,$00
-         !byte $F0,$02
-         !byte $A9,$FF
+         !byte $18        ; CLC
+         !byte $B0,$7E    ; BCS +
+         !byte $A5,$00    ; LDA $00
          !byte $48
          bcs   +          ; passport-test-suite/Hardball.woz [C=0] matches
-         inx
-         inx
-         inx
-         inx
-         inx
-         inx
-         inx
-         inx
-         jsr   modify1
-         !byte $00
+         jsr   modify3
+         !byte $A9,$00    ; LDA #$00
+         !byte $60        ; RTS
 +
diff --git a/src/wholetrack.a b/src/wholetrack.a
index 19f84dc..184d6aa 100755
--- a/src/wholetrack.a
+++ b/src/wholetrack.a
@@ -267,9 +267,7 @@ IsWideTrack
          beq   +
          sec
          rts
-+        lda   #TRUE
-         sta   gPossibleSigCheck
-         clc
++        clc
          rts
 
 ;-------------------------------