diff --git a/src/constants.a b/src/constants.a
index 0363299..d13615c 100644
--- a/src/constants.a
+++ b/src/constants.a
@@ -189,6 +189,7 @@ EnableAccelerator  = DisableAccelerator+3
 ; AND masks for MockingboardStuff
 MOCKINGBOARD_SLOT = %00001111
 HAS_SPEECH        = %11000000
+MOCKINGBOARD_NEW  = %00100000
 
 ; AND masks for game info bitfield (after game display name in gSearchStore)
 HAS_DHGR_TITLE    = %10000000        ; this one is hard-coded via BMI instead of AND/BNE
diff --git a/src/prelaunch/_FileInformation.txt b/src/prelaunch/_FileInformation.txt
index 1d9e598..90d314a 100644
--- a/src/prelaunch/_FileInformation.txt
+++ b/src/prelaunch/_FileInformation.txt
@@ -1 +1,3 @@
 # This file is maintained by hand
+
+BLACK.BELT.MB=Type(06),AuxType(0200),Access(C3)
diff --git a/src/prelaunch/black.belt.a b/src/prelaunch/black.belt.a
index 1d11b1c..4c3895b 100644
--- a/src/prelaunch/black.belt.a
+++ b/src/prelaunch/black.belt.a
@@ -7,49 +7,15 @@
 
     !source "src/prelaunch/common.a"
 
-         +ENABLE_ACCEL
-         lda   #$4C
-         sta   $85F
-         jsr   $800       ; decompress
-         +DISABLE_ACCEL
-         jsr   $8F00      ; title
-         +ENABLE_ACCEL
-         lda   #$4C
-         sta   $8A0
-         ldy   #0
-         jsr   $865       ; decompress
-         +READ_RAM2_NO_WRITE
-         lda   MockingboardStuff
-         beq   .nomock
-         pha
-         lda   #$a9
-         sta   $1506
-         jsr   $BC0E      ; decompress new Mockingboard support
-         pla
-         and   #$20
-         bne   .newmock
-         jsr   $BC07      ; decompress old Mockingboard support
-.newmock
-
-.nomock
-         lda   #$4C
-         sta   $BC12
-         lda   #<callback
-         sta   $BC13
-         lda   #>callback
-         sta   $BC14
-         jsr   DisableAccelerator
+         +READ_RAM2_WRITE_RAM2
+         jsr   EnableAccelerator
+         +LOAD_FILE_AT blackbelt_mb, $200
          +READ_ROM_NO_WRITE
-         jmp   $8A3
+         jmp   $200
 
-callback
-         +ENABLE_ACCEL
-         lda   #0
-         sta   $B6
-         jsr   $BC16
-         +DISABLE_ACCEL
-         lda   #0
-         rts
+blackbelt_mb
+         !byte 23
+         !text "PRELAUNCH/BLACK.BELT.MB"
 
 !if * > $1C0 {
   !error "code is too large, ends at ", *
diff --git a/src/prelaunch/black.belt.mb.a b/src/prelaunch/black.belt.mb.a
new file mode 100644
index 0000000..abdddd6
--- /dev/null
+++ b/src/prelaunch/black.belt.mb.a
@@ -0,0 +1,78 @@
+;license:MIT
+;(c) 2023 by qkumba
+
+!cpu 6502
+!to "build/PRELAUNCH/BLACK.BELT.MB",plain
+*=$200
+
+         !source "src/constants.a"   ; no code in these
+         !source "src/macros.a"
+
+         +ENABLE_ACCEL
+         lda   #$4C
+         sta   $85F
+         jsr   $800       ; decompress
+         +DISABLE_ACCEL
+         jsr   $8F00      ; title
+         +ENABLE_ACCEL
+         lda   #$4C
+         sta   $8A0
+         ldy   #0
+         nop
+         nop
+         nop              ; alignment for SMC
+         jsr   $865       ; decompress
+         +READ_RAM2_NO_WRITE
+         lda   MockingboardStuff
+         beq   .nomock
+         pha
+         jsr   $BC0E      ; decompress new Mockingboard support
+         lda   #0         ; SMC
+         pla
+         pha
+         and   #MOCKINGBOARD_NEW
+         bne   .newmock
+         jsr   $BC07      ; decompress old Mockingboard support
+.newmock
+         pla
+         and   #7
+         ora   #$C0
+         ldx   #0
+-        ldy   $15FB, x
+         cpy   #$C4
+         bne   +
+         sta   $15FB, x
++        ldy   $A000, x
+         cpy   #$C4
+         bne   +
+         sta   $A000, x
++        ldy   $A100, x
+         cpy   #$C4
+         bne   +
+         sta   $A100, x
++        inx
+         bne   -
+
+.nomock
+         lda   #$4C
+         sta   $BC12
+         lda   #<callback
+         sta   $BC13
+         lda   #>callback
+         sta   $BC14
+         jsr   DisableAccelerator
+         +READ_ROM_NO_WRITE
+         jmp   $8A3
+
+callback
+         +ENABLE_ACCEL
+         lda   #0
+         sta   $B6
+         jsr   $BC16
+         +DISABLE_ACCEL
+         lda   #0
+         rts
+
+!if * > $2FF {
+  !error "code is too large, ends at ", *
+}
diff --git a/winmake.bat b/winmake.bat
index 30c6210..cc2baec 100644
--- a/winmake.bat
+++ b/winmake.bat
@@ -29,6 +29,7 @@ rem version 3.1.0 or later
 set EXOMIZER=exomizer mem -q -P23 -lnone
 
 if "%1" equ "dsk" (
+call :clean
 call :index
 if "%2". equ "". (
   call :asmproboot
@@ -73,6 +74,7 @@ if "%1" equ "clean" (
 if "%2". neq "". (
 1>nul move build\%DISK%
 )
+:clean
 echo y|1>nul 2>nul rd build /s
 if "%2". neq "". (
 md build
@@ -314,8 +316,7 @@ goto :EOF
 
 :asmlauncher
 2>nul 1>build\buildnum.log %GIT% rev-list --count HEAD
-if errorlevel 1 (set _build=0
-) else for /f "tokens=*" %%q in (build\buildnum.log) do set _build=%%q
+if errorlevel 1 (set _build=0) else for /f "tokens=*" %%q in (build\buildnum.log) do set _build=%%q
 2>build\relbase.log %ACME% -DBUILDNUMBER=%_build% src\4cade.a
 for /f "tokens=*" %%q in (build\relbase.log) do set _make=%%q
 %ACME% -DBUILDNUMBER=%_build% -DRELBASE=$!_make:~-5,4! -r build\4cade.lst src\4cade.a