diff --git a/src/id/inspect0.a b/src/id/inspect0.a
index 87e222b..e66e76e 100755
--- a/src/id/inspect0.a
+++ b/src/id/inspect0.a
@@ -141,19 +141,26 @@ IDBootloader
 ;
          jsr   IDMECC
          bcs   .notmecc
-         jsr   IDMECCM8
-         bcs   .notmeccm8
-         jmp   foundmeccm8
-.notmeccm8
-         jsr   IDMECCM7
-         bcs   .notmeccm7
-         jmp   foundmeccm7
+         lda   #s_mecc
+         jsr   PrintByID
+         jsr   CopyUniversal
+         jsr   IDMECC1
+         bcs   .notmecc1
+         jmp   foundmecc1
+.notmecc1
+         jsr   IDMECC2
+         bcs   .notmecc2
+         jmp   foundmecc2
 
-.notmeccm7
-         jsr   IDMECCM6
-         bcs   .notmeccm6
-         jmp   foundmeccm6
-.notmeccm6
+.notmecc2
+         jsr   IDMECC3
+         bcs   .notmecc3
+         jmp   foundmecc3
+.notmecc3
+         jsr   IDMECC4
+         bcs   .notmecc4
+         jmp   foundmecc4
+.notmecc4
 .notmecc
 ;
 ; Try to identify the encrypted Datasoft bootloader.
diff --git a/src/id/mecc.a b/src/id/mecc.a
index e533389..4aa8ca3 100755
--- a/src/id/mecc.a
+++ b/src/id/mecc.a
@@ -2,15 +2,18 @@
 ; IDMECC
 ; identify MECC custom bootloader
 ; note: there are several MECC RWTSes that share
-; the same bootloader, so further checks will be
-; required to distinguish between them
+; the same early bootloader, so further checks
+; are required to distinguish between them after
+; this function matches
 ;
 ; in:  track buffer contains T00,S00
 ; out: C clear if MECC bootloader was found
+;        (and track buffer now contains all of track 0)
 ;      C set if not found
 ;      all other flags clobbered
 ;      all registers clobbered
 ;-------------------------------
+!zone {
 IDMECC
          lda   #$00
          ldx   #$00
@@ -19,34 +22,37 @@ IDMECC
          !byte $01,$4C,$1A,$08,$17,$0F,$00,$00
          !byte $0D,$0B,$09,$07,$05,$03,$01,$0E
          !byte $0C,$0A,$08,$06,$04,$02,$0F
+         bcs   .exit
+         lda   #$00
+         sta   gTrack
+         sta   gAddress
+         lda   #$0F
+         sta   gSector
+         clc
+         adc   #BASEPAGE
+         sta   gAddress+1
+-        jsr   ReadSector
+         bcs   .exit
+         dec   gAddress+1
+         dec   gSector
+         bne   -
+.exit
          rts
+}
 
 ;-------------------------------
-; IDMECCM8
-; identify MECC "M8" bootloader
+; IDMECC1
+; identify MECC bootloader variant #1
+; (labeled "M8" on original disks)
 ;
-; in:  track buffer contains T00,S00
+; in:  track buffer contains all of track 0
 ; out: C clear if MECC "M8" bootloader was found
 ;      C set if not found
 ;      all other flags clobbered
 ;      all registers clobbered
 ;-------------------------------
 !zone {
-IDMECCM8
-         lda   #$00
-         sta   gTrack
-         sta   gAddress
-         lda   #$0B
-         sta   gSector
-         clc
-         adc   #BASEPAGE
-         sta   gAddress+1
-         jsr   ReadSector
-         bcs   .exit
-
-; This entry point is also called by the meccm8 patcher
-; in lieu of keeping a global variable around.
-IDMECCM8RWTS
+IDMECC1
          lda   #$0B
          ldx   #$02
          ldy   #$06
@@ -84,7 +90,7 @@ IDMECCM8RWTS
 .exit
          rts
 
-foundmeccm8
+foundmecc1
 ;
 ; We found an "M8" MECC bootloader. Now we create
 ; an RWTS that can read the rest of the disk.
@@ -92,9 +98,6 @@ foundmeccm8
 ; and data prologues based on the parameters of the
 ; original disk.
 ;
-         lda   #s_meccb0
-         jsr   PrintByID
-         jsr   CopyUniversal
          lda   #$00
          sta   modsrc
          lda   #$0B
@@ -124,31 +127,20 @@ foundmeccm8
 }
 
 ;-------------------------------
-; IDMECCM7
-; identify MECC "M7" bootloader
+; IDMECC2
+; identify MECC bootloader variant #2
+; (labeled "M7" on original disks)
 ;
-; in:  track buffer contains T00,S00
+; in:  track buffer contains all of track 0
 ; out: C clear if MECC "M7" bootloader was found
 ;      C set if not found
 ;      all other flags clobbered
 ;      all registers clobbered
 ;-------------------------------
 !zone {
-IDMECCM7
-         lda   #$00
-         sta   gTrack
-         sta   gAddress
-         lda   #$07
-         sta   gSector
-         clc
-         adc   #BASEPAGE
-         sta   gAddress+1
-         jsr   ReadSector
-         bcs   .exit
-; This entry point is also called by the meccm7 patcher
-; in lieu of keeping a global variable around.
-IDMECCM7RWTS
+IDMECC2
          lda   #$07
+IDMECC4a
          ldx   #$7D
          ldy   #$06
          jsr   compare    ; IF T00,S07,$7D ==
@@ -181,7 +173,7 @@ IDMECCM7RWTS
 .exit
          rts
 
-foundmeccm7
+foundmecc2
 ;
 ; We found an "M7" MECC bootloader. Now we create
 ; an RWTS that can read the rest of the disk.
@@ -189,17 +181,13 @@ foundmeccm7
 ; and data prologues based on the parameters of the
 ; original disk.
 ;
-         lda   #s_meccm7
-         jsr   PrintByID
-
-         jsr   CopyUniversal
-
-         lda   #$00
-         sta   modsrc
          lda   #$07
+foundmecc4a
          clc
          adc   #BASEPAGE
          sta   modsrc+1
+         lda   #$00
+         sta   modsrc
          ldy   #$83
          lda   (modsrc),y
          lsr
@@ -223,34 +211,18 @@ foundmeccm7
 }
 
 ;-------------------------------
-; IDMECCM6
-; identify MECC "M6" bootloader
+; IDMECC3
+; identify MECC bootloader (M7 variant
+; found in Word Muncher v1.1 and others)
 ;
-; in:  track buffer contains T00,S00
-; out: C clear if MECC "M6" bootloader was found
+; in:  track buffer contains all of track 0
+; out: C clear if this MECC bootloader variant was found
 ;      C set if not found
 ;      all other flags clobbered
 ;      all registers clobbered
 ;-------------------------------
 !zone {
-IDMECCM6
-         lda   #$00
-         sta   gTrack
-         sta   gAddress
-         lda   #$0B
-         sta   gSector
-         clc
-         adc   #BASEPAGE
-         sta   gAddress+1
-         jsr   ReadSector
-         bcs   .exit
-         dec   gSector
-         dec   gAddress+1
-         jsr   ReadSector
-         bcs   .exit
-; This entry point is also called by the meccm6 patcher
-; in lieu of keeping a global variable around.
-IDMECCM6RWTS
+IDMECC3
          lda   #$0A
          ldx   #$E2
          ldy   #$06
@@ -285,19 +257,14 @@ IDMECCM6RWTS
 .exit
          rts
 
-foundmeccm6
+foundmecc3
 ;
-; We found an "M6" MECC bootloader. Now we create
+; We found a MECC bootloader. Now we create
 ; an RWTS that can read the rest of the disk.
 ; Starting with our built-in RWTS, we modify address
 ; and data prologues based on the parameters of the
 ; original disk.
 ;
-         lda   #s_meccm6
-         jsr   PrintByID
-
-         jsr   CopyUniversal
-
          lda   #$00
          sta   modsrc
          lda   #$0A
@@ -326,3 +293,33 @@ foundmeccm6
          sta   $B8FC
          jmp   ADStyle
 }
+
+;-------------------------------
+; IDMECC4
+; identify MECC bootloader variant #4
+; (labeled "M7" on original disks)
+; same as variant #2 but everything is
+; on T00,S08 instead of T00,S07
+;
+; in:  track buffer contains all of track 0
+; out: C clear if MECC bootloader was found
+;      C set if not found
+;      all other flags clobbered
+;      all registers clobbered
+;-------------------------------
+!zone {
+IDMECC4
+         lda   #$08
+         jmp   IDMECC4a
+
+foundmecc4
+;
+; We found a MECC bootloader. Now we create
+; an RWTS that can read the rest of the disk.
+; Starting with our built-in RWTS, we modify address
+; and data prologues based on the parameters of the
+; original disk.
+;
+         lda   #$08
+         jmp   foundmecc4a
+}
diff --git a/src/passport.a b/src/passport.a
index 5a6569e..0e62cde 100755
--- a/src/passport.a
+++ b/src/passport.a
@@ -670,9 +670,10 @@ _applyToT00
          !source "patchers/bademu.a"
          !source "patchers/bademu2.a"
          !source "patchers/rwts.a"
-         !source "patchers/meccm8.a"
-         !source "patchers/meccm7.a"
-         !source "patchers/meccm6.a"
+         !source "patchers/mecc1.a"
+         !source "patchers/mecc2.a"
+         !source "patchers/mecc3.a"
+         !source "patchers/mecc4.a"
          !source "patchers/rol1e.a"
          !source "patchers/jmpb4bb.a"
          !source "patchers/jmpb4bbhi.a"
diff --git a/src/patchers/meccm8.a b/src/patchers/mecc1.a
similarity index 94%
rename from src/patchers/meccm8.a
rename to src/patchers/mecc1.a
index d92d7e9..88c8098 100755
--- a/src/patchers/meccm8.a
+++ b/src/patchers/mecc1.a
@@ -8,7 +8,7 @@
 _meccm8
          jsr   IDMECC
          bcs   .exit
-         jsr   IDMECCM8RWTS
+         jsr   IDMECC1
          bcs   .exit
          lda   #$0B
          ldx   #$08
diff --git a/src/patchers/meccm7.a b/src/patchers/mecc2.a
similarity index 94%
rename from src/patchers/meccm7.a
rename to src/patchers/mecc2.a
index 3a573c2..5c958b0 100755
--- a/src/patchers/meccm7.a
+++ b/src/patchers/mecc2.a
@@ -8,7 +8,7 @@
 _meccm7
          jsr   IDMECC
          bcs   .exit
-         jsr   IDMECCM7RWTS
+         jsr   IDMECC2
          bcs   .exit
          lda   #$07
          ldx   #$83
diff --git a/src/patchers/meccm6.a b/src/patchers/mecc3.a
similarity index 91%
rename from src/patchers/meccm6.a
rename to src/patchers/mecc3.a
index fa1eda0..e379de5 100644
--- a/src/patchers/meccm6.a
+++ b/src/patchers/mecc3.a
@@ -1,14 +1,14 @@
 ;-------------------------------
-; #MECCM6
+; #MECC3
 ; MECC fastloader with custom
 ; address and data prologues
-; e.g. early versions of Word Munchers
+; e.g. Word Munchers v1.1
 ;-------------------------------
 !zone {
-_meccm6
+_mecc3
          jsr   IDMECC
          bcs   .exit
-         jsr   IDMECCM6RWTS
+         jsr   IDMECC3
          bcs   .exit
          lda   #$0A
          ldx   #$E8
diff --git a/src/patchers/mecc4.a b/src/patchers/mecc4.a
new file mode 100644
index 0000000..545fdf1
--- /dev/null
+++ b/src/patchers/mecc4.a
@@ -0,0 +1,73 @@
+;-------------------------------
+; #MECC4
+; MECC fastloader with custom
+; address and data prologues
+; e.g. A-201 Conquering Whole Numbers
+;-------------------------------
+!zone {
+_mecc4
+         jsr   IDMECC
+         bcs   .exit
+         jsr   IDMECC4
+         bcs   .exit
+         lda   #$08
+         ldx   #$83
+         ldy   #$01
+         jsr   compare    ; if T00,S08,$83 !=
+         !byte $D5
+         bcc   .addr2
+         ldy   #$01
+         jsr   modify     ; then set T00,S08,$83 =
+         !byte $D5
+.addr2
+         lda   #$08
+         ldx   #$8D
+         ldy   #$01
+         jsr   compare    ; if T00,S08,$8D !=
+         !byte $AA
+         bcc   .addr3
+         ldy   #$01
+         jsr   modify     ; then set T00,S08,$8D =
+         !byte $AA
+.addr3
+         lda   #$08
+         ldx   #$98
+         ldy   #$01
+         jsr   compare    ; if T00,S08,$98 !=
+         !byte $96
+         bcc   .data1
+         ldy   #$01
+         jsr   modify     ; then set T00,S08,$98 =
+         !byte $96
+.data1
+         lda   #$08
+         ldx   #$15
+         ldy   #$01
+         jsr   compare    ; if T00,S08,$15 !=
+         !byte $D5
+         bcc   .data2
+         ldy   #$01
+         jsr   modify     ; then set T00,S08,$15 =
+         !byte $D5
+.data2
+         lda   #$08
+         ldx   #$1F
+         ldy   #$01
+         jsr   compare    ; if T00,S08,$1F !=
+         !byte $AA
+         bcc   .data3
+         ldy   #$01
+         jsr   modify     ; then set T00,S08,$1F =
+         !byte $AA
+.data3
+         lda   #$08
+         ldx   #$2A
+         ldy   #$01
+         jsr   compare    ; if T00,S08,$2A !=
+         !byte $AD
+         bcc   .exit
+         ldy   #$01
+         jsr   modify     ; then set T00,S08,$2A =
+         !byte $AD
+.exit
+}
diff --git a/src/strings/en.a b/src/strings/en.a
index 1e6d8c7..f0ed22f 100755
--- a/src/strings/en.a
+++ b/src/strings/en.a
@@ -53,7 +53,7 @@ s_modifyto =   $22
 s_dosb0  =     $23
 s_prodosb0 =   $24
 s_pascalb0 =   $25
-s_meccb0 =     $26
+s_mecc =       $26
 s_sierra =     $27
 s_a6bc95 =     $28
 s_jmpbcf0 =    $29
@@ -68,7 +68,7 @@ s_thunder =    $31
 s_jmpae8e =    $32
 s_diskvol =    $33
 s_d5d5f7 =     $34
-s_meccm7 =     $35
+s_construct=   $35
 s_datasoftb0 = $36
 s_datasoft =   $37
 s_lsr6a  =     $38
@@ -89,9 +89,7 @@ s_eab0    =    $46
 s_eatrk6  =    $47
 s_eeef   =     $48
 s_poke   =     $49
-s_construct=   $4A
-s_meccm6 =     $4B
-STRINGCOUNT =  $4C
+STRINGCOUNT =  $4A
 
 !zone {
 StringTable
@@ -133,7 +131,7 @@ StringTable
          !word .dosboot0
          !word .prodosboot0
          !word .pascalboot0
-         !word .meccboot0
+         !word .mecc
          !word .sierra
          !word .a6bc95
          !word .jmpbcf0
@@ -148,7 +146,7 @@ StringTable
          !word .jmpae8e
          !word .diskvol
          !word .d5d5f7
-         !word .meccm7
+         !word .construct
          !word .datasoftb0
          !word .datasoft
          !word .lsr6a
@@ -169,8 +167,6 @@ StringTable
          !word .eatrk6
          !word .eeef
          !word .poke
-         !word .construct
-         !word .meccm6
 ;
 ; Text can contain substitution strings, which
 ; are replaced by current values at runtime. Each
@@ -196,7 +192,7 @@ StringTable
 ; can be set directly before calling PrintByID.
 ;
 .header
-         !text "Passport by 4am               2017-02-20",00
+         !text "Passport by 4am               2017-02-21",00
 .mainmenu
          !text "________________________________________",$8D,$8D,$8D,$8D,$8D,$8D,$8D
          !text "              "
@@ -335,8 +331,8 @@ StringTable
          !text "T00,S00 Found ProDOS bootloader",$8D,00
 .pascalboot0
          !text "T00,S00 Found Pascal bootloader",$8D,00
-.meccboot0
-         !text "T00 Found MECC M8 bootloader",$8D,00
+.mecc
+         !text "T00,S00 Found MECC bootloader",$8D,00
 .sierra
          !text "T%t,S%0 Found Sierra protection check",$8D,00
 .a6bc95
@@ -378,8 +374,8 @@ StringTable
          !text "disk volume number.",$8D,00
 .d5d5f7
          !text "T%t,S%0 Found D5D5F7 protection check",$8D,00
-.meccm7
-         !text "T00 Found MECC M7 bootloader",$8D,00
+.construct
+         !text "T01,S0F Reconstructing missing data",$8D,$00
 .datasoftb0
          !text "T00,S00 Found Datasoft bootloader",$8D,00
 .datasoft
@@ -431,8 +427,4 @@ StringTable
 .poke
          !text "T%t,S%0 BASIC program POKEs protection",$8D
          !text "check into memory and CALLs it.",$8D,$00
-.construct
-         !text "T01,S0F Reconstructing missing data",$8D,$00
-.meccm6
-         !text "T00 Found MECC M6 bootloader",$8D,00
 }