add support for David-DOS bootloader (log only)

src/id/daviddos.a

@@ -0,0 +1,32 @@
+;-------------------------------
+; IDDavid
+; identify David-DOS bootloader
+;
+; in:  $0800..$08FF contains T00,S00
+;      first page of track buffer also contains T00,S00
+; out: C clear if David-DOS bootloader found
+;      C set otherwise
+;      all registers clobbered
+;      all other flags clobbered
+;-------------------------------
+!zone {
+IDDavid
+         lda   #$00
+         ldx   #$01
+         ldy   #$06
+         jsr   compare    ; if T00,S00,$01 ==
+         !byte $A5,$27    ; LDA $27
+         !byte $C9,$09    ; CMP #$09
+         !byte $D0,$17    ; BNE +$17
+         bcs   .exit
+         lda   #$00
+         ldx   #$4A
+         ldy   #$0B
+         jsr   compare    ; and T00,S00,$4A ==
+         !byte $A2,$0D    ; LDX #$0D
+         !byte $BD,$B9,$08; LDA $08B9,X
+         !byte $9D,$0D,$04; STA $040D,X
+         !byte $CA        ; DEX
+         !byte $10,$F7    ; BPL -
+.exit    rts
+}

src/id/inspect0.a

@@ -240,6 +240,16 @@ IDBootloader
          jmp   foundea
 
 .notea
+;
+; Try to identify David-DOS bootloader
+; (no special behavior for now because all samples I have are
+; handled by built-in RWTS, so no need to trace)
+;
+         jsr   IDDavid
+         bcs   .notdavid
+         lda   #s_daviddos
+         jsr   PrintByID
+.notdavid
 .useuniv
 ;
 ; We didn't recognize the boot sector, so use the universal

src/passport.a

@@ -151,6 +151,7 @@ FirstMover
          !source "id/encode53.a"
          !source "id/ea.a"
          !source "id/milliken.a"
+         !source "id/daviddos.a"
          !source "print.a"
          !source "compare.a"
          !source "modify.a"

src/strings/en.a

@@ -92,7 +92,8 @@ s_poke   =     $49
 s_bootcounter = $4A
 s_milliken =   $4B
 s_jsr8b3 =     $4C
-STRINGCOUNT =  $4D
+s_daviddos =   $4D
+STRINGCOUNT =  $4E
 
 !zone {
 StringTable
@@ -173,6 +174,7 @@ StringTable
          !word .bootcounter
          !word .milliken
          !word .jsr8b3
+         !word .daviddos
 ;
 ; Text can contain substitution strings, which
 ; are replaced by current values at runtime. Each
@@ -198,7 +200,7 @@ StringTable
 ; can be set directly before calling PrintByID.
 ;
 .header
-         !text "Passport by 4am               2017-05-01",00
+         !text "Passport by 4am               2017-05-04",00
 .mainmenu
          !text "________________________________________",$8D,$8D,$8D,$8D,$8D,$8D,$8D
          !text "              "
@@ -441,4 +443,6 @@ StringTable
          !text "T02,S05 might be unreadable",$8D,00
 .jsr8b3
          !text "T00,S00 Found JSR $08B3 bootloader",$8D,00
+.daviddos
+         !text "T00,S00 Found David-DOS bootloader",$8D,00
 }