fix off-by-1 errors

src/id/555.a

@@ -24,7 +24,7 @@
          !byte $90,$EF          ; BCC *-$0F
          bcc .exit        ; passport-test-suite/Jumpman.woz [C=0] matches
          lda   #8
-         ldy   #19
+         ldy   #18
          jsr   SearchSector
          !byte $4C,$76,$08  ; JMP $0876
          !byte $00,$03,$05

src/id/daviddos.a

@@ -13,7 +13,7 @@
 ;        all other registers & flags clobbered
 ;-------------------------------
 !macro IDDavid {
-         ldy   #$06
+         ldy   #$07
          jsr   compare    ; if T00,S00,$00 ==
          !byte $01
          !byte $A5,$27    ; LDA $27
@@ -21,6 +21,7 @@
          !byte $D0,$17    ; BNE +$17
          bcs   @notDavid
          ldx   #$4A
+         dey
          jsr   compare    ; and T00,S00,$4A ==
          !byte $A2,WILDCARD    ; LDX #$**
          !byte $BD,WILDCARD,$08; LDA $08**,X

src/patchers/t00_bb03.a

@@ -22,9 +22,9 @@
 ;-------------------------------
 !zone {
          lda   #$07       ; sector to check for David-DOS variant
-         lda   gIsDavidDOS
+         ldy   gIsDavidDOS
          beq   .check
-         lda   gIsBoot0   ; if DOS 3.3 boot0 loader
+         ldy   gIsBoot0   ; if DOS 3.3 boot0 loader
          bne   .exit
          lda   #$05       ; sector to check for DOS 3.3 variant
 .check   ldx   #$03
@@ -34,7 +34,7 @@
          jsr   PrintByID
          !byte s_bb03
 
-         lda   gIsDavidDOS
+         ldy   gIsDavidDOS
          beq   .variant2
 
          lda   #$01