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Read number of total blocks from ProDOS 8 volume directory header - and fall back on the constant 280 only for non-ProDOS 8 disks.
git-svn-id: svn://svn.cc65.org/cc65/trunk@4750 b7a2c559-68d2-44c3-8de9-860c34a00d81
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@ -433,13 +433,6 @@ BASIC.SYSTEM) there are some limitations for DOS 3.3:
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</descrip><p>
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<sect1>DIO<p>
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Although <htmlurl url="dio.html" name="DIO"> generally works with all ProDOS 8
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devices, the function <htmlurl url="dio-3.html" name="dio_query_sectcount()">
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simply always return 280 (which is only correct for a 140 KB disk).
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<sect1>Direct console I/O<p>
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<descrip>
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@ -493,15 +486,27 @@ name="assembler manual">.
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<sect1>DIO<p>
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The function <htmlurl url="dio-1.html" name="dio_open()"> has the single parameter
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<tt/drive_id/ to identify the drive to be opened. Therefore an Apple II
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slot and drive pair is mapped to that <tt/drive_id/ according to the formula
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<descrip>
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<verb>
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<tag/Drive ID/
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The function <htmlurl url="dio-1.html" name="dio_open()"> has the single
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parameter <tt/drive_id/ to identify the drive to be opened. Therefore an
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Apple II slot and drive pair is mapped to that <tt/drive_id/ according
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to the formula
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<verb>
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drive_id = slot * 16 + (drive - 1) * 128
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</verb>
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</verb>
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so that for example slot 6 drive 2 is mapped to <tt/drive_id/ 224.
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so that for example slot 6 drive 2 is mapped to <tt/drive_id/ 224.
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<tag/Sector count/
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The function <htmlurl url="dio-3.html" name="dio_query_sectcount()"> returns
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the correct sector count for all ProDOS 8 disks. However for any non-ProDOS 8
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disk it simply always return 280 (which is only correct for a 140 KB disk).
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This condition is indicated by the _oserror value 82.
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</descrip><p>
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@ -434,13 +434,6 @@ BASIC.SYSTEM) there are some limitations for DOS 3.3:
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</descrip><p>
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<sect1>DIO<p>
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Although <htmlurl url="dio.html" name="DIO"> generally works with all ProDOS 8
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devices, the function <htmlurl url="dio-3.html" name="dio_query_sectcount()">
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simply always return 280 (which is only correct for a 140 KB disk).
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<sect1>Direct console I/O<p>
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<descrip>
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@ -499,15 +492,27 @@ name="assembler manual">.
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<sect1>DIO<p>
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The function <htmlurl url="dio-1.html" name="dio_open()"> has the single parameter
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<tt/drive_id/ to identify the drive to be opened. Therefore an Apple II
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slot and drive pair is mapped to that <tt/drive_id/ according to the formula
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<descrip>
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<verb>
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<tag/Drive ID/
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The function <htmlurl url="dio-1.html" name="dio_open()"> has the single
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parameter <tt/drive_id/ to identify the drive to be opened. Therefore an
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Apple II slot and drive pair is mapped to that <tt/drive_id/ according
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to the formula
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<verb>
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drive_id = slot * 16 + (drive - 1) * 128
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</verb>
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</verb>
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so that for example slot 6 drive 2 is mapped to <tt/drive_id/ 224.
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so that for example slot 6 drive 2 is mapped to <tt/drive_id/ 224.
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<tag/Sector count/
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The function <htmlurl url="dio-3.html" name="dio_query_sectcount()"> returns
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the correct sector count for all ProDOS 8 disks. However for any non-ProDOS 8
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disk it simply always return 280 (which is only correct for a 140 KB disk).
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This condition is indicated by the _oserror value 82.
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</descrip><p>
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@ -5,8 +5,91 @@
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;
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.export _dio_query_sectcount
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.import _dio_query_sectsize, _malloc, _free
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.include "zeropage.inc"
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.include "errno.inc"
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.include "mli.inc"
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_dio_query_sectcount:
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lda #<280
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ldx #>280
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; Set handle
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sta mliparam + MLI::ON_LINE::UNIT_NUM
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; Get ProDOS 8 block size (clears __oserror)
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jsr _dio_query_sectsize
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; Alloc buffer
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jsr _malloc
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sta ptr4
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stx ptr4+1
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; Set buffer
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sta mliparam + MLI::ON_LINE::DATA_BUFFER
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stx mliparam + MLI::ON_LINE::DATA_BUFFER+1
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; Check buffer (hibyte is enough)
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txa
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beq nomem
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; Get device state
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lda #ON_LINE_CALL
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ldx #ON_LINE_COUNT
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jsr callmli
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bcs check
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; UNIT_NUM already set
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.assert MLI::RW_BLOCK::UNIT_NUM = MLI::ON_LINE::UNIT_NUM, error
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; DATA_BUFFER already set
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.assert MLI::RW_BLOCK::DATA_BUFFER = MLI::ON_LINE::DATA_BUFFER, error
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; Read volume directory key block
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tax ; A = 0
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lda #$02
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sta mliparam + MLI::RW_BLOCK::BLOCK_NUM
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stx mliparam + MLI::RW_BLOCK::BLOCK_NUM+1
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lda #READ_BLOCK_CALL
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ldx #RW_BLOCK_COUNT
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jsr callmli
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bcs oserr
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; Get and save total blocks from volume directory header
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ldy #$29
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lda (ptr4),y
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pha
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iny
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lda (ptr4),y
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pha
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; Cleanup buffer
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done: lda ptr4
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ldx ptr4+1
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jsr _free
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; Restore total blocks and return
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pla
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tax
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pla
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rts
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nomem: lda #$FF ; Error code for sure not used by MLI
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oserr: sta __oserror
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; Save total blocks for failure
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lda #$00
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pha
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pha
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beq done ; Branch always
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; Check for non-ProDOS disk
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check: cmp #$52 ; "Not a ProDOS volume"
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bne oserr
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sta __oserror
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; Save total blocks for a 16-sector disk
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lda #<280
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pha
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lda #>280
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pha
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bne done ; Branch always
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