diff --git a/src/passport.a b/src/passport.a
index ebe197b..db81e80 100755
--- a/src/passport.a
+++ b/src/passport.a
@@ -701,22 +701,23 @@ _applyToT00
          !source "patchers/jsr8b3.a"
 _applyToAll
          !source "patchers/universale7.a"
-         !source "patchers/runhello.a"
-         !source "patchers/a6bc95.a"
-         !source "patchers/a5count.a"
+         !source "patchers/runhello.a"          ; !gIsProDOS && !gIsPascal only
+         !source "patchers/a6bc95.a"            ; gIsPascal only
+         !source "patchers/a5count.a"           ; gIsPascal only
          !source "patchers/d5d5f7.a"
-         !source "patchers/prodosrwts.a"
-         !source "patchers/prodos6a.a"
-         !source "patchers/prodosmecc.a"
+         !source "patchers/prodosrwts.a"        ; gIsProDOS only
+         !source "patchers/prodos6a.a"          ; gIsProDOS only
+         !source "patchers/prodosmecc.a"        ; gIsProDOS only
          !source "patchers/rwtsswapmecc.a"
-         !source "patchers/protecteddos.a"
+         !source "patchers/protecteddos.a"      ; gIsProtDOS only
          !source "patchers/fbff.a"
          !source "patchers/sierra.a"
          !source "patchers/corrupter.a"
-         !source "patchers/ea.a"
-         !source "patchers/gamco.a"
-         !source "patchers/optimum.a"
-         !source "patchers/bootcounter.a"
+         !source "patchers/ea.a"                ; gIsEA only (+gIsBoot0 for DOS titles)
+         !source "patchers/gamco.a"             ; gIsEEEF only
+         !source "patchers/optimum.a"           ; gIsOptimum only
+         !source "patchers/bootcounter.a"       ; T01 only
+         !source "patchers/jmpb412.a"           ; T02 only
 
          lda   gPatchCount
          beq   .nopatches
diff --git a/src/patchers/jmpb412.a b/src/patchers/jmpb412.a
new file mode 100644
index 0000000..00f6d12
--- /dev/null
+++ b/src/patchers/jmpb412.a
@@ -0,0 +1,57 @@
+;-------------------------------
+; #JMPB412
+; Boot1 jumps to $B3C3 to read
+; and decrypt a nibble check at
+; $B412, which exits via $9D84
+; if successful
+;
+; Zoo Goer
+; Zoo Collector
+; Zoo Builder
+; America Coast to Coast (Mindscape release)
+;-------------------------------
+!zone {
+         lda   gTrack
+         cmp   #$02
+         bne   .exit
+
+         lda   #$00
+         ldx   #$C3
+         ldy   #$35
+         jsr   compare    ; if T02,S00,$C3 ==
+         !byte $A9,WILDCARD;LDA #$**
+         !byte $8D,$EC,$B7; STA $B7EC
+         !byte $A9,WILDCARD;LDA #$**
+         !byte $8D,$ED,$B7; STA $B7ED
+         !byte $A9,$B4    ; LDA #$B4
+         !byte $8D,$F1,$B7; STA $B7F1
+         !byte $A9,$00    ; LDA #$00
+         !byte $8D,$F3,$B7; STA $B7F3
+         !byte $8D,$EB,$B7; STA $B7EB
+         !byte $A9,$B7    ; LDA #$B7
+         !byte $A0,$E8    ; LDY #$E8
+         !byte $20,$B5,$B7; JSR $B7B5
+         !byte $A0,$00    ; LDY #$00
+         !byte $B9,$12,$B4; LDA $B412,Y
+         !byte $49,WILDCARD;EOR #$**
+         !byte $99,$12,$B4; STA $B412,Y
+         !byte $C8        ; INY
+         !byte $C0,$FF    ; CPY #$FF
+         !byte $D0,$F3    ; BNE
+         !byte WILDCARD
+         !byte WILDCARD
+         !byte WILDCARD
+         !byte WILDCARD
+         !byte WILDCARD
+         !byte $4C,$12,$B4; JMP $B412
+         bcs   .exit
+         sta   gDisplayBytes
+         lda   #s_jmpb412
+         jsr   PrintByID
+         lda   #$00
+         ldx   #$F6
+         ldy   #$02
+         jsr   modify     ; then set T02,S00,$F6 =
+         !byte $84,$9D
+.exit
+}
diff --git a/src/patchers/rwtsswapmecc.a b/src/patchers/rwtsswapmecc.a
index fd04a1c..9e3667d 100755
--- a/src/patchers/rwtsswapmecc.a
+++ b/src/patchers/rwtsswapmecc.a
@@ -2,6 +2,8 @@
 ; #RWTSSWAPMECC
 ; post-boot RWTS swapper in MECC
 ; disks
+; TODO might be able to gate this on MECC fastloader
+; (I think it's only used on Dataquest disks)
 ;-------------------------------
 !zone {
 _rwtsswapmecc
diff --git a/src/strings/en.a b/src/strings/en.a
index fdca0c7..db577de 100755
--- a/src/strings/en.a
+++ b/src/strings/en.a
@@ -96,7 +96,8 @@ s_daviddos =   $4D
 s_quickdos =   $4E
 s_diversidos = $4F
 s_prontodos =  $50
-STRINGCOUNT =  $51
+s_jmpb412 =    $51
+STRINGCOUNT =  $52
 
 !zone {
 StringTable
@@ -181,6 +182,7 @@ StringTable
          !word .quickdos
          !word .diversidos
          !word .prontodos
+         !word .jmpb412
 ;
 ; Text can contain substitution strings, which
 ; are replaced by current values at runtime. Each
@@ -457,4 +459,7 @@ StringTable
          !text "T00,S00 Found Diversi-DOS bootloader",$8D,00
 .prontodos
          !text "T00,S00 Found Pronto-DOS bootloader",$8D,00
+.jmpb412
+         !text "T02,S00 Disk calls a protection check",$8D
+         !text "at $B412 before initializing DOS.",$8D,00
 }