[WIP] ScanForRAMDisk

src/mli.a

@@ -1,6 +1,8 @@
 ; MLI command codes
 CMD_CREATE =   $C0        ; create new file
 CMD_DESTROY =  $C1        ; delete a file
+CMD_GETFILEINFO = $C4     ; get file (or volume) info
+CMD_ONLINE =   $C5        ; check online volume(s)
 CMD_SETPREFIX = $C6       ; change default pathname prefix
 CMD_OPEN =     $C8        ; open a file
 CMD_NEWLINE =  $C9        ; set line-by-line read mode
@@ -12,6 +14,8 @@ CMD_SETMARK =  $CE        ; change position in an open file
 ; MLI parameter counts
 PC_CREATE =    $07
 PC_DESTROY =   $01
+PC_GETFILEINFO = $0A
+PC_ONLINE =    $02
 PC_SETPREFIX = $01
 PC_OPEN  =     $03
 PC_NEWLINE =   $03
@@ -501,6 +505,43 @@ SetPrefix
          jsr   mli
          rts
 
+;-------------------------------
+; get volume name of disk in specific slot+drive
+; in:  A = unit number (DSSS0000)
+; out: if no disk in drive or any MLI error, C set and A contains error code
+;      if disk found, C clear and @VolumeName contains volume name
+;      (length byte + up to 14 character name, no leading slash)
+;-------------------------------
+!zone {
+GetVolumeName
+         sta   mliparam+1
+         lda   #<OnlineReturn
+         sta   mliparam+2
+         lda   #>OnlineReturn
+         sta   mliparam+3
+         jsr   Online
+         rts
+OnlineReturn
+         !byte $FF
+VolumeName
+         !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF
+         !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
+}
+
+;-------------------------------
+; check if volume is online
+; using ProDOS MLI
+; in:  caller has filled @mliparam
+;        with unit number
+; out: if error, C set and A contains error code
+;      if success, C clear
+;-------------------------------
+Online
+         lda   #CMD_ONLINE
+         ldy   #PC_ONLINE
+         jsr   mli
+         rts
+
 ;-------------------------------
 ; low-level MLI wrapper
 ; in:  A = MLI command code

src/passport.a

@@ -87,6 +87,7 @@ cmp1     =     $F8        ; word
 cmp2     =     $FA        ; word
 counter  =     $FC        ; byte
 tmp      =     $FC        ; byte
+iunit    =     $FC        ; byte
 tmpa     =     $FC        ; byte
 tmpx     =     $FD        ; byte
 tmpy     =     $FE        ; byte
@@ -94,7 +95,7 @@ flag     =     $FF        ; byte
 }
 
 ; Application constants (not zero addresses)
-RELBASE  =     $6100      ; address to move Passport code
+RELBASE  =     $6000      ; address to move Passport code
                           ; so that it's out of the way
 LOWPOINT =     $4300      ; lowest available address for code
 BASEPAGE =     $10        ; Special Delivery tracer assumes
@@ -185,6 +186,7 @@ OneTimeSetup
          bne   .founds6
          jmp   FatalNoSlot6
 .founds6
+         jsr   ScanForRAMDisk
          jsr   LoadPrefs  ; load preferences (if available)
          bcc   ResetVector
          jsr   SavePrefs  ; save preferences (if possible)

src/slots.a

@@ -76,3 +76,30 @@ NextSlot
 .reallydone
          rts
 }
+
+!zone {
+ScanForRAMDisk
+         rts
+
+         lda   #$00
+         sta   $0800
+         sta   $0801
+
+         lda   #$00
+         sta   iunit
+-        lda   iunit
+         clc
+         adc   #$10
+         sta   iunit
+         beq   .done
+         cmp   #$80
+         beq   -
+         jsr   GetVolumeName
+         bcs   -
+         lda   #<VolumeName
+         sta   $0800
+         lda   #>VolumeName
+         sta   $0801
+.done
+         jmp   $ff59
+}

src/strings/en.a

@@ -210,7 +210,7 @@ StringTable
 ; can be set directly before calling PrintByID.
 ;
 .header
-         !text "Passport by 4am               2017-05-14",00
+         !text "Passport by 4am               2017-05-16",00
 .mainmenu
          !text "________________________________________",$8D,$8D,$8D,$8D,$8D,$8D,$8D
          !text "              "