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46 lines
1022 B
Plaintext
46 lines
1022 B
Plaintext
DOS 3.3 MEMORY LAYOUT
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$C000 --- TOP OF RAM
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$B600 --- RWTS
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$AAC9 --- FILE MANAGER
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$9D00 --- MAIN DOS ROUTINES
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$9600 -- DOS FILE BUFFERS (MAXFILES 3)
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BD00 - RWTS main entry
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- call with AY pointing at IOB
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Input/Output Control Block
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OFFSET DESCRIPTION
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$00 Table Type (must be 1)
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$01 Slot Number times 0x10
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$02 Drive Number ($01 or $02)
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$03 Volume Number ($00 matches any volume)
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$04 Track Number
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$05 Sector Number
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$06/$07 Address (lo/hi) of Device Characteristics Table
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$08/$09 Address (lo/hi) of 256 byte buffer for READ/WRITE
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$0A Not Used
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$0B byte count for partial sector
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$0c Command Code
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$00 = SEEK
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$01 = READ
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$02 = WRITE
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$04 = FORMAT
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$0d Return Code (if non zero, carry flag should be set)
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$00 = no error
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$08 = error during initialization
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$10 = write protect error
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$20 = volume mismatch error
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$40 = drive error
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$80 = read error (obsolete)
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$0e volume number of last access
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$0f slot number of last acces * 16
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$10 drive number of last access
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