enable booting Ultracheckers from drive 2 (#38)

src/anti-m.a

@@ -175,8 +175,6 @@ CheckDrive2
          bne   --
 -        lda   $C0EC
          bpl   -
-         cmp   #$96
-         bne   --
 
 @driveoff
          lda   $C0E8
@@ -346,7 +344,7 @@ StringTable
          !word @mainmenu
 
 @header
-         !text "Anti-M v1.9pre by 4am         2022-03-20"
+         !text "Anti-M v1.9pre by 4am         2022-04-19"
          !text "________________________________________",$8D
          !text $8D,$8D,$8D,$8D,$8D,$8D,$8D,$8D,$00
 @mainmenu

src/idboot.a

@@ -253,6 +253,18 @@ IDBoot13
          jmp   @dispatch
 
 @notdos32f
+         lda   #$7D
+         ldx   #$6E
+         ldy   #8
+         jsr   @CompareMemoryRel
+         !byte $BD,$8A,$C0 ;LDA $C08A,X
+         !byte $B0,$03     ;BCS *+5
+         !byte $BD,$8B,$C0 ;LDA $C08B,X
+         bcs   @notdos32g
+         inc   $7D6F
+         jmp   @dispatch
+
+@notdos32g
 
 @dispatch
          lda   $d1d1 ;SMC