simplify universal RWTS (remove unnecessary D5-plus-timing-bit address prologue, init Y=F7 in B944)

src/id/inspect0.a

@@ -293,10 +293,6 @@ PrereadT00Partial
          lda   #$00
          sta   gTrack
          sta   gAddress
-         lda   #$F0
-         sta   $B959
-         lda   #$05
-         sta   $B95A
 -        jsr   ReadSector
          bcs   .exit
          dec   gAddress+1

src/id/trace.a

@@ -15,19 +15,6 @@ TraceDOS33
          sta   gTrack
          lda   #$09
          sta   gSector
-;
-; This pre-check is made more difficult by the fact that
-; some disks have a timing bit after the $D5 nibble in
-; the address prologue, which triggers the wrong code path
-; in our built-in RWTS. So just for this pre-check, we
-; disable that code path. This hack will get overwritten
-; either by the disk's own RWTS when we capture it, or by
-; re-copying the built-in RWTS later.
-;
-         lda   #$F0
-         sta   $B959
-         lda   #$05
-         sta   $B95A
 precheck
          ldy   #<gRWTSParams
          lda   #>gRWTSParams

src/passport.a

@@ -276,41 +276,10 @@ Action
          sta   TEXTTOP
          lda   #s_reading
          jsr   PrintByID
-;
-; For the initial T00,S00 check, we need to wait much longer
-; than usual to find the address prologue, because sector 0
-; might literally be the only standard sector on the track.
-; This will get overridden as soon as we either trace the
-; disk's RWTS or copy the universal RWTS again. (One of these
-; is guaranteed to happen before we read the rest of the disk.)
-;
-         lda   #$E7
-         sta   $B945
          ldy   #<gRWTSParams ; call universal RWTS to see
          lda   #>gRWTSParams ; if T00,S00 is readable
-         jsr   $BD00      ; (only care about the return code)
-         bcs   .fatalt00s00
-         jmp   .checkt00s00
-.fatalt00s00
-         lda   #$F0
-         sta   $B959
-         lda   #$05
-         sta   $B95A
-         ldy   #<gRWTSParams
-         lda   #>gRWTSParams
-         jsr   $BD00
-         bcs   .reallyfatal
-;
-; Bad emulator detected (disk controller presents nibbles
-; immediately instead of based on cycle count). Patch the
-; universal RWTS to compensate.
-;
-         lda   #$F0
-         sta   _B959
-         lda   #$05
-         sta   _B95A
-         bne   .checkt00s00 ; unconditional branch
-.reallyfatal
+         jsr   $BD00         ; (only care about the return code)
+         bcc   .checkt00s00
          lda   #s_fail
          jsr   PrintByID
          lda   #s_fatal0000

src/universalrwts.a

@@ -68,20 +68,18 @@ universalrwts
          !byte $10,$fb,$d9,$00,$ba,$d0,$13,$18
          !byte $60,$00,$00,$00,$00,$00,$00,$00
          !byte $00,$00,$00,$00,$00,$00,$00,$00
-         !byte $00,$00,$38,$60,$a0,$fc,$84,$26
+         !byte $00,$00,$38,$60,$a0,$f7,$84,$26
          !byte $c8,$d0,$04,$e6,$26,$f0,$f3,$bd
          !byte $8c,$c0,$10,$fb,$4a,$c9,$6a,$d0
-         !byte $ef
-_B959    !byte $bd
-_B95A    !byte $8c,$c0,$c9,$d5,$f0,$36
+         !byte $ef,$f0,$05,$00,$00,$00,$00,$00
          !byte $bd,$8c,$c0,$10,$fb,$c9,$aa,$d0
          !byte $df,$bd,$8c,$c0,$10,$fb,$c9,$96
          !byte $d0,$d6,$a0,$03,$a9,$00,$85,$27
          !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,$8D,$9B
-         !byte $B9,$F0,$D7,$00,$00,$00,$18,$60
+         !byte $d0,$00,$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
          !byte $85,$27,$38,$e5,$2a,$f0,$33,$b0