verify address prologue checksum by default, then turn it off when necessary

src/id/trace.a

@@ -15,6 +15,8 @@ TraceDOS33
          sta   gTrack
          lda   #$09
          sta   gSector
+         lda   #$00
+         sta   $b991
 precheck
          ldy   #<gRWTSParams
          lda   #>gRWTSParams

src/passport.a

@@ -276,6 +276,8 @@ Action
          sta   TEXTTOP
          lda   #s_reading
          jsr   PrintByID
+         lda   #$00
+         sta   $b991
          ldy   #<gRWTSParams ; call universal RWTS to see
          lda   #>gRWTSParams ; if T00,S00 is readable
          jsr   $BD00         ; (only care about the return code)
@@ -286,6 +288,8 @@ Action
          jsr   PrintByID
          jmp   TheEnd
 .checkt00s00
+         lda   #$02
+         sta   $b991
          jmp   IDBootloader ; /src/id/inspect0
 
 

src/universalrwts.a

@@ -78,7 +78,7 @@ universalrwts
          !byte $bd,$8c,$c0,$10,$fb,$2a,$85,$26
          !byte $bd,$8c,$c0,$10,$fb,$25,$26,$99
          !byte $2c,$00,$45,$27,$88,$10,$e7,$a8
-         !byte $d0,$00,$18,$60,$38,$60,$00,$00
+         !byte $d0,$02,$18,$60,$38,$60,$00,$00
          !byte $00,$00,$00,$00,$00,$00,$18,$60
          !byte $86,$2b,$85,$2a,$cd,$78,$04,$f0
          !byte $53,$a9,$00,$85,$26,$ad,$78,$04