shave some bytes

src/universalstyle.a

@@ -1,7 +1,34 @@
+;-------------------------------
+; UseUniversal
+; Caller has decided to use the built-in RWTS to read
+; this disk (possibly already patched with disk-specific
+; parameters). Now we check for protections that require
+; additional patches or callbacks before we start.
+;
+; in:    $0800..$08FF contains boot0
+;        $B600..$BFFF contains boot1
+; out:   all registers clobbered
+;        exits via ReadWithRWTS
+;-------------------------------
 UseUniversal
          jsr   IncProgress
+;
+; Copy built-in RWTS into place ($B800..$BFFF)
+;
          jsr   StartWithUniv
 ;
+; On pure 13-sector disks, we just hijack the read routine to perform a
+; verification instead.
+;
++
+         lda   gIs13Sector
+         bne   +
+         lda   #<read13
+         sta   jCallRWTS+1
+         lda   #>read13
+         sta   jCallRWTS+2
+         bne   @doneUnivPatching     ; always branches
+;
 ; On Dinkey-DOS disks (e.g. Ultima V, Times of Lore), we start with the
 ; universal RWTS then apply a patch in memory.
 ; These disks use a hybrid RWTS that alters the sector number in the
@@ -12,37 +39,49 @@ UseUniversal
 ;
          lda   gIsDinkeyDOS
          bne   +
-         jsr   PatchUniversalRWTSForOrigin
+         ldy   #$0F
+-        lda   _originAddressEpilogue, y
+         sta   $B990, y
+         dey
+         bpl   -
+         ldy   #$0A
+-        lda   _originDataEpilogue, y
+         sta   $B92F, y
+         dey
+         bpl   -
          bmi   @doneUnivPatching     ; always branches
 ;
 ; On TSR disks (e.g. Dawn Patrol, Dungeon), we start with the universal
 ; RWTS then apply a patch in memory.
 ;
-+        lda   gIsTSR
++
+         lda   gIsTSR
          bne   +
-         jsr   PatchUniversalRWTSForTSR
+         lda   #<_tsrCallback
-;
+         sta   $BE8C
-; On pure 13-sector disks, we just hijack the read routine to perform a
+         lda   #>_tsrCallback
-; verification instead.
+         sta   $BE8D
-;
-+        lda   gIs13Sector
-         bne   +
-         lda   #<read13
-         sta   jCallRWTS+1
-         lda   #>read13
-         sta   jCallRWTS+2
-         bne   @doneUnivPatching     ; always branches
 ;
 ; On other disks that use the universal RWTS for the entire disk, we use
 ; an adaptive RWTS that accepts any epilogue on the first sector but then
 ; enforces all other sectors to have the same epilogue.
 ;
-+        jsr   PatchUniversalRWTSForAdaptive
++
+         ldy   #$09
+-        lda   _adaptiveAddressEpilogue, y
+         sta   $B994, y
+         lda   _adaptiveDataEpilogue, y
+         sta   $B938, y
+         dey
+         bpl   -
 ;
 ; Disable drive recalibration on bad sectors so we give up on bad sectors
 ; faster and detect unformatted or specially structured tracks faster.
 ;
-         jsr   PatchUniversalRWTSForNoRecal
+         lda   #$B0
+         sta   $BDD2
+         lda   #$30
+         sta   $BDD3
 ;
 ; Some disks have different epilogues on track 0, so we stop using the
 ; adaptive RWTS so we don't falsely accuse those disks of being damaged.
@@ -100,49 +139,20 @@ CopyUniversalAnywhere
          bne   .culoop
          rts
 
-PatchUniversalRWTSForNoRecal
+_adaptiveAddressEpilogue  ; to $B994
-         lda   #$B0
-         sta   $BDD2
-         lda   #$30
-         sta   $BDD3
-         rts
-
-PatchUniversalRWTSForAdaptive
-; out:    N flag set
-         ldy   #$09
--        lda   @addressepilogue, y
-         sta   $B994, y
-         lda   @dataepilogue, y
-         sta   $B938, y
-         dey
-         bpl   -
-         rts
-@addressepilogue          ; to $B994
          !byte $8D,$91,$B9
          !byte $A9,$AE
          !byte $8D,$93,$B9
          !byte $D0,$00
-@dataepilogue             ; to $B938
+
+_adaptiveDataEpilogue     ; to $B938
          !byte $8D,$35,$B9
          !byte $A9,$0A
          !byte $8D,$37,$B9
          !byte $18
          !byte $60
 
-PatchUniversalRWTSForOrigin
+_originAddressEpilogue    ; to $B990
-; out:    N=1
-         ldy   #$0F
--        lda   @addressepilogue, y
-         sta   $B990, y
-         dey
-         bpl   -
-         ldy   #$0A
--        lda   @dataepilogue, y
-         sta   $B92F, y
-         dey
-         bpl   -
-         rts
-@addressepilogue          ; to $B990
          !byte $C9,$AB
          !byte $D0,$0A
          !byte $EA
@@ -151,7 +161,8 @@ PatchUniversalRWTSForOrigin
          !byte $F0,$95
          !byte $D0,$00
          !byte $18,$60
-@dataepilogue             ; to $B92F
+
+_originDataEpilogue       ; to $B92F
          !byte $18
          !byte $60
          !byte $38
@@ -161,14 +172,7 @@ PatchUniversalRWTSForOrigin
          !byte $18
          !byte $60
 
-PatchUniversalRWTSForTSR
+_tsrCallback
-; out:   Z=0
-         lda   #<@tsr_callback
-         sta   $BE8C
-         lda   #>@tsr_callback
-         sta   $BE8D
-         rts
-@tsr_callback
          pha
          ldy   gTrack
          cpy   #$05