prep for 2.2 release

Co-authored-by: Peter Ferrie <peter.ferrie@gmail.com>

README.md

@@ -3,7 +3,7 @@
 Boot any Apple II disk on any Apple II
 
 [Download latest Anti-M disk image](https://github.com/a2-4am/anti-m/releases/latest/download/anti-m.dsk)
-(version **2.0**, released **2023-09-18**, runs on any 48K Apple II)
+(version **2.2**, released **2024-02-27**, runs on any 48K Apple II)
 
 ## What is this?
 
@@ -99,6 +99,14 @@ launching Anti-M.
 
 ## History
 
+v2.2 - 2024-02-27
+
+- add support for ABM
+
+v2.1 - 2024-02-23
+
+- fix detection of 13-sector disks (thanks John A. for the report)
+
 v2.0 - 2023-09-18
 
 - fix a crash when booting "Story Maker"

src/anti-m.a

@@ -6,7 +6,7 @@
 ;-------------------------------
 ; Anti-M
 ; a 4am hack
-; (c) 2019-2023 by 4am
+; (c) 2019-2024 by 4am
 ;
 ; Permission is hereby granted, free of charge, to any
 ; person obtaining a copy of this software and associated
@@ -175,7 +175,7 @@ CheckDrive2
          bne   --
 -        lda   $C0EC
          bpl   -
-         cmp   #$96
+         cmp   #$AD
          bne   --
 
 @driveoff
@@ -346,7 +346,7 @@ StringTable
          !word @mainmenu
 
 @header
-         !text "Anti-M v2.0 by 4am            2023-09-18"
+         !text "Anti-M v2.2 by 4am            2024-02-27"
          !text "________________________________________",$8D
          !text $8D,$8D,$8D,$8D,$8D,$8D,$8D,$8D,$00
 @mainmenu

src/idbroderbund.a

@@ -25,6 +25,7 @@
 ; - Russki Duck (Gebelli)
 ; - Zenith (Gebelli)
 ; - Disk Recovery (Sensible Software)
+; - ABM (MUSE)
 ;
 IDBroderbund
 ; first stage is just a standard hybrid DOS 3.2/3.3 bootloader
@@ -267,6 +268,10 @@ IDBroderbund
          ldx   #<@DOS33Callback
          ldy   #>@DOS33Callback
          cmp   #$B6
+         beq   @hookhybrid
+         ldx   #<@MUSECallback
+         ldy   #>@MUSECallback
+         cmp   #$76
          bne   @jmpdos
 
 @hookhybrid
@@ -440,6 +445,24 @@ IDBroderbund
          ldx   #$60
          jmp   $B700
 
+@MUSECallback
+         lda   $85FF
+         beq   @skip2f
+         lda   #$7D
+         ldx   #$5F
+         ldy   #8
+         jsr   CompareMemory
+         !byte $BD,$8A,$C0 ;LDA $C08A,X
+         !byte $B0,$03     ;BCS *+5
+         !byte $BD,$8B,$C0 ;LDA $C08B,X
+         bcs   @notmuse
+         inc   $7D60
+
+@notmuse
+@skip2f
+         ldx   #$60
+         jmp   $7700
+
 @StarThiefCallback2 !pseudopc $110 {
 @StarThiefCallback2x
          lda   #$4C