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87 lines
3.4 KiB
Plaintext
87 lines
3.4 KiB
Plaintext
; Copyright 2018 faddenSoft. All Rights Reserved.
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; See the LICENSE.txt file for distribution terms (Apache 2.0).
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;
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; Source: Beneath Apple DOS
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*SYNOPSIS DOS 3.3 public addresses and constants.
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;
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; Page 3 entry points.
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;
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DOS_WRM @ $03d0 ;DOS warmstart entry point
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DOS_CLD @ $03d3 ;DOS coldstart entry point
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DOS_FM @ $03d6 ;DOS file manager entry point
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DOS_RWTS @ $03d9 ;RWTS entry point
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DOS_LOCFPL @ $03dc ;loads Y/A with address of FM param list
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DOS_LOCRPL @ $03e3 ;loads Y/A with address of RWTS IOB
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DOS_CHARIO @ $03ea ;jumps to routine that connects DOS KSW/CSW
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; I/O scratchpad RAM addresses
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; See Apple II Reference Manual table 26 (page 83)
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DOS_BOOT_SLOT @ $05f8 ;disk controller boot slot
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DOS_FILE_LENGTH @ $aa60 2 ;range length for LOAD and BLOAD
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DOS_FILE_ADDRESS @ $aa72 2 ;address of last file loaded
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;
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; Some frequently-used addresses inside the DOS RWTS (Read/Write Track/Sector)
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; implementation.
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;
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RWTS_ENTRY @ $b7b5 ;disable interrupts and call RWTS
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RWTS_PARAM_BLOCK @ $b7e8 ;RWTS parameter block
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RWTS_TABLE_TYPE @ $b7e8 ;table type, must be $01
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RWTS_SLOT_NUM @ $b7e9 ;slot number times 16
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RWTS_DRIVE_NUM @ $b7ea ;drive number (1 or 2)
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RWTS_VOL_EXP @ $b7eb ;volume number expected (0 matches all)
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RWTS_TRACK_NUM @ $b7ec ;track number (0 - 34)
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RWTS_SECTOR_NUM @ $b7ed ;sector number (0-15)
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RWTS_DCT @ $b7ee 2 ;pointer to Device Characteristics Table
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RWTS_BUF @ $b7f0 2 ;pointer to data buffer for READ/WRITE
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;RWTS_UNUSED @ $b7f2
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RWTS_PARTIAL_COUNT @ $b7f3 ;byte count for partial sector
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RWTS_CMD_CODE @ $b7f4 ;0=seek, 1=read, 2=write, 4=format
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RWTS_ERR_CODE @ $b7f5 ;err code (when carry set)
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; $10=write protected, $20=volume mismatch, $40=drive error, $08=INIT error
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RWTS_VOL_FOUND @ $b7f6 ;volume number found
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RWTS_SLOT_FOUND @ $b7f7 ;slot number found
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RWTS_DRIVE_FOUND @ $b7f8 ;drive number found
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;
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; Offsets into the Volume Table of Contents (VTOC).
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;
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O_VTOC_CATTRK = $01 ;track number of first catalog sector
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O_VTOC_CATSCT = $02 ;sector number of first catalog sector
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O_VTOC_VERSION = $03 ;version of DOS that created this VTOC
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O_VTOC_NUMTRK = $34 ;number of tracks per disk
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O_VTOC_NUMSCT = $35 ;number of sectors per track
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O_VTOC_NUMBYT = $36 ;(2B) number of bytes per sector
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O_VTOC_INUSE = $38 ;start of in-use bitmap
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;
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; Offsets into catalog sectors.
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;
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O_DOSCAT_NXTTRK = $01 ;track number of next catalog sector
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O_DOSCAT_NXTSCT = $02 ;sector number of next catalog sector
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O_DOSCAT_ENTRY = $0b ;offset of first File Descriptive Entry
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;
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; Catalog sector File Descriptive Entries.
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;
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O_DOSFDE_TRK = $00 ;track of first track/sector list
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O_DOSFDE_SCT = $01 ;sector of first track/sector list
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O_DOSFDE_TYPE = $02 ;file type and lock flag
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O_DOSFDE_NAME = $03 ;(30B) file name
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O_DOSFDE_LEN = $21 ;length of file, in sectors
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DOSFDE_SIZE = $23 ;size of an FDE entry
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DOS_MAX_NAME_LEN = 30 ;filenames are limited to 30 chars
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;
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; Track/sector list.
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;
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O_DOSTS_NXTTRK = $01 ;track number of next T/S list sector
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O_DOSTS_NXTSCT = $02 ;sector number of next T/S list sector
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O_DOSTS_SCTOFF = $05 ;(2B) sector offset of first T/S entry
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O_DOSTS_LIST = $0c ;(244B) T/S pairs; entries may be zero
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