auto-slot MB for Willy Byte

src/prelaunch/willy.byte.a

@@ -11,6 +11,30 @@
          lda   #$60
          sta   $426B
          jsr   $4000      ; decompress
+
+         +GET_MOCKINGBOARD_SLOT
+         bcc   no_mock
+-        ldy   $76BF, x
+         cpy   #$C4
+         bne   +
+         sta   $76BF, x
++        ldy   $7842, x
+         cpy   #$C4
+         bne   +
+         sta   $7842, x
++        ldy   $9FCC, x
+         cpy   #$C4
+         bne   +
+         sta   $9FCC, x
++        ldy   $A0F6, x
+         cpy   #$C4
+         bne   +
+         sta   $A0F6, x
++        inx
+         bne   -
+         sta   $9EB6
+
+no_mock
          lda   #<callback1
          sta   $BD7C
          lda   #>callback1