mirror of
https://github.com/iKarith/beneath-apple-dos.git
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256 lines
9.8 KiB
Plaintext
256 lines
9.8 KiB
Plaintext
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.np
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A884-A908 DOS command name text table.
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This table consists of the ASCII name for each DOS
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command in order of command index values, with the
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last character of each indicated by the MSB being
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on. Commands in order are:
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INIT,LOAD,SAVE,RUN,CHAIN,DELETE,LOCK,UNLOCK,CLOSE,
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READ,EXEC,WRITE,POSITION,OPEN,APPEND,RENAME,
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CATALOG,MON,NOMON,PR#,IN#,MAXFILES,FP,INT,BSAVE,
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BLOAD,BRUN,VERIFY.
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Example: INIT is $49 $4E $49 $D4 (I N I T)
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.np
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A909-A940 Command valid keywords table.
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This table is used to determine which keywords are
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required or may be given for any DOS command.
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Each command has a two byte entry with 16 flags,
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indicating which keywords may be given. The flag
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bit settings are as follows:
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.ul
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BIT MEANING
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0 Filename legal but optional
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1 Command has no positional operand
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2 Filename #1 expected
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3 Filename #2 expected
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4 Slot number positional operand expected
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5 MAXFILES value expected as positional operand
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6 Command may only be issued from within a program
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7 Command may create a new file if file not found
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8 C, I, O keywords legal
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9 V keyword legal
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10 D keyword legal
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11 S keyword legal
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12 L keyword legal
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13 R keyword legal
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14 B keyword legal
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15 A keyword legal
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Thus, for a typical command, OPEN, where the value
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is $2378, bits 2, 6, 7, 9, 10, 11, and 12 are set so
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the command has one filename operand, may only be
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issued from within a program, may create a new file,
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and the V, D, S, and L keywords are legal.
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The command entries are:
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INIT 2170
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LOAD A070
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SAVE A170
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RUN A070
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CHAIN 2070
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DELETE 2070
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LOCK 2070
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UNLOCK 2070
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CLOSE 6000
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READ 2206
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EXEC 2074
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WRITE 2206
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POSITION 2204
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OPEN 2378
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APPEND 2270
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RENAME 3070
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CATALOG 4070
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MON 4080
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NOMON 4080
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PR# 0800
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IN# 0800
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MAXFILES 0400
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FP 4070
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INT 4000
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BSAVE 2179
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BLOAD 2071
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BRUN 2071
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VERIFY 2070
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.np
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A941-A94A Keyword name table.
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This table contains all the ASCII names of the DOS
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keywords in standard order. Each keyword name
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occupies one byte:
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V,D,S,L,R,B,A,C,I,O
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.np
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A94B-A954 Keyword flag bit positions table.
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This table gives the bit positions for each keyword
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into the second byte of the command valid keyword
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table above and in the flag (AA65) which indicates
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which keywords were present on the command line.
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The bit positions are:
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V - 40
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D - 20
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S - 10
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L - 08
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R - 04
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B - 02
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A - 01
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C - C0 ...
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I - A0 ... not used in valid keyword table
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O - 90 ...
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.np
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A955-A970 Keyword value valid range table.
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This table indicates the range any keyword value
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may legally have. Each keyword has a four byte entry,
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two bytes of minimum value, and two bytes of maximum
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value. Values are:
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.ul
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KEYWORD MIN MAX
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V 0 254
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D 1 2
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S 1 7
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L 1 32767
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R 0 32767
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B 0 32767
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A 0 65535
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C, I, and O do not appear in this table since they
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do not have numeric values.
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.np
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A971-AA3E Error message text table.
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This table contains the text for each error code in
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order of error code number:
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.ul
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NUMBER TEXT
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0 RETURN BELL RETURN
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1 "LANGUAGE NOT AVAILABLE"
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2 "RANGE ERROR" (Bad file manager opcode)
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3 "RANGE ERROR" (Bad file manager subcode)
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4 "WRITE PROTECTED
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5 "END OF DATA"
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6 "FILE NOT FOUND"
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7 "VOLUME MISMATCH"
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8 "I/O ERROR"
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9 "DISK FULL"
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10 "FILE LOCKED"
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11 "SYNTAX ERROR"
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12 "NO BUFFERS AVAILABLE"
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13 "FILE TYPE MISMATCH"
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14 "PROGRAM TOO LARGE"
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15 "NOT DIRECT COMMAND"
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.np
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AA3F-AA4F Error message text offset index table.
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This table contains the offset in bytes to the text
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of any given error message in the table above.
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Entries are one byte each for each error code number.
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.np
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AA4F-AA65 DOS main routines variables.
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AA4F Current file buffer address (2 bytes).
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AA51 Status flags: $01=READ state, $00=Warmstart,
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$80=Coldstart, $40=APPLESOFT RAM
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AA52 DOS CSWL intercept state number.
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AA53 Address of true CSWL handler (2 bytes).
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AA55 Address of true KSWL handler (2 bytes).
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AA57 MAXFILES value.
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AA59 Save area for S, X, Y, and A registers when DOS is
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entered (4 bytes).
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AA5D Command line index value (offset into line).
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AA5E MON flags: (C=$40, I=$20, O=$10)
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AA5F Index of last command times 2.
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AA60 Range length for LOAD and BLOAD (2 bytes).
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AA62 Index of pending command, if any.
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AA63 Scratch variable (counter, message index, etc.)
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AA64 Index of current keyword.
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AA65 Keywords present on command line flags.
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.np
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AA66-AA74 Keyword values parsed from command and defaulted.
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AA66 Volume (2 bytes)
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AA68 Drive (2 bytes)
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AA6A Slot (2 bytes)
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AA6C Length (2 bytes)
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AA6E Record (2 bytes)
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AA70 Byte (2 bytes)
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AA72 Address (2 bytes)
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AA74 MON value (one byte)
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.np
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AA75-AA92 Primary file name buffer
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.np
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AA93-AAB0 Secondary (RENAME) file name buffer
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.np
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AAB1-AAC0 DOS main routines constants and variables.
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AAB1 MAXFILES default ($03).
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AAB2 Control-D ($84).
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AAB3 EXEC file active flag ($00=not active).
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AAB4 EXEC file buffer address (2 bytes).
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AAB6 Active BASIC flag: $00=INTEGER, $40=APPLESOFT ROM,
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$80=APPLESOFT RAM
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AAB7 RUN intercepted flag.
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AAB8 "APPLESOFT" characters in ASCII (9 bytes)
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.np
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AAC1-AAC8 File manager constants.
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AAC1 Address of RWTS paramter list (B7E8).
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AAC3 Address of VTOC sector buffer (B3BB).
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AAC5 Address of directory sector buffer (B4BB).
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AAC7 Address of last byte of DOS plus one. (C000)
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.np
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AAC9-AAE4 File manager function routine entry point table.
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This table contains a two byte function handler
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routine address for each of the 14 file manager
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opcodes in opcode order.
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.np
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AAE5-AAF0 File manager read subcode handler entry point table.
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This table contains a two byte function handler
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routine address for each of the 6 read subcodes.
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.np
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AAF1-AAFC File manager write subcode handler entry point table.
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This table contains a two byte function handler
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routine address for each of the 6 write subcodes.
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.np
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AAFD-AB05 File manager external entry point (from $3D6).
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Is X register zero?
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If so, allow new files by simulating an INIT command
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index.
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Otherwise, require old file by simulating a LOAD
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command index.
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Fall through to main file manager entry point.
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.np
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AB06-AB1E File manager main entry.
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Save S register at B39B.
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Restore file manager workarea from file buffer (AE6A)
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Make sure opcode does not exceed 13.
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If it does, return with code=2 (invalid opcode).
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Use opcode as index into file manager function
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routine entry point table and go to proper handler
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via RTS.
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.np
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AB1F-AB21 Return with return code=2 (bad opcode).
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.np
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AB22-AB27 OPEN function handler.
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Call common open code (AB28).
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Exit file manager.
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.np
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AB28-ABDB Common open routine.
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Initialize file manager workarea by resetting
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variables to their defaults (ABDC).
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Set sector length to 256.
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Insure record length is non-zero. If zero, use 1.
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Store record length in file manager workarea.
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Locate or allocate a directory entry for the file
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(B1C9).
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If file already exists, go to ABA6.
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Otherwise, save directory index for free entry.
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Using last command index and valid keywords table,
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determine whether current command may create a new
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file.
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If so, go to AB64.
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Otherwise, if running "APPLESOFT", set return code
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to "LANGUAGE NOT AVAILABLE" and exit.
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If not running "APPLESOFT" set return code to "FILE
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NOT FOUND" and exit.
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AB64 Set sector count in directory entry to 1 (there will
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only be a T/S List sector initially).
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Allocate a sector for a T/S List (B244).
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Store sector number of this sector in directory
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entry and in first and current T/S List sector number
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in file manager workarea.
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Store track number in both places also.
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Move file type desired to directory entry.
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Write directory sector back to catalog (B037).
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Select T/S List buffer (AF0C).
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Zero it (B7D6).
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And write it back (AF3A).
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Set return code to 6 ("FILE NOT FOUND").
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.nx ch8.5
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