232 lines
14 KiB
HTML
232 lines
14 KiB
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<TITLE>Int 21/AX=440Ch
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<META NAME="Description" CONTENT="
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Int 21/AX=440Ch - Greg Shenaut ASPITAPE.SYS - INTERFACE -
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AX = 440Ch
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BX = device handle
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CH = category code
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07h tape (ASPITAPE.SYS)
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CL = function
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01h mtop - perform tape operation
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02h mtget - get tape status
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03h ignore end-of-tape errors
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04h enable end-of-tape errors
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DS:DX - parameter block (see #01554,#01555)
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<h2>Int 21/AX=440Ch
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<h3><font color=#C00040>Greg Shenaut ASPITAPE.SYS - INTERFACE</font></h3>
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<PRE>
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AX = 440Ch
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BX = device handle
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CH = category code
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07h tape (ASPITAPE.SYS)
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CL = function
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01h "mtop" - perform tape operation
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02h "mtget" - get tape status
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03h ignore end-of-tape errors
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04h enable end-of-tape errors
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DS:DX -> parameter block <a href="javascript:if(confirm('http://www.ctyme.com/intr/rb-0000.htm \n\nThis file was not retrieved by Teleport Pro, because it was unavailable, or its retrieval was aborted, or the project was stopped too soon. \n\nDo you want to open it from the server?'))window.location='http://www.ctyme.com/intr/rb-0000.htm#Table0'" tppabs="http://www.ctyme.com/intr/rb-0000.htm#Table0"></a>(see #01554,#01555)<br>
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<p><b>Return:</b><br>CF set on error
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AX = error code <a href="javascript:if(confirm('http://www.ctyme.com/intr/rb-0000.htm \n\nThis file was not retrieved by Teleport Pro, because it was unavailable, or its retrieval was aborted, or the project was stopped too soon. \n\nDo you want to open it from the server?'))window.location='http://www.ctyme.com/intr/rb-0000.htm#Table0'" tppabs="http://www.ctyme.com/intr/rb-0000.htm#Table0"></a>(see #01680 at AH=59h/BX=0000h)
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CF clear if successful
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DS:DX -> data block
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</PRE>
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<p><b>Notes:</b>
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This device driver is a simple DOS interface to the Adaptec Advanced
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SCSI Programming Interface (ASPI). It provides the following device
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names as access to the SCSI tape, 'RMTx' (rewind on close) and
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'NRMTx' (NO rewind on close) where x can go from 0 to 3. There may
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also be the following names 'MTx' and 'NMTx' which default to 1024
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byte blocks. The names may also have a '$' appended to try and make
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them unique from file names of 'RMT0' etc..
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Once opend these devices must be put into RAW mode
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<p><b>See Also:</b>
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<a href="rb-2832.htm" tppabs="http://www.ctyme.com/intr/rb-2832.htm">AX=4402h"ASPI"</a>
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<PRE>
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<p>
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Format of ASPITAPE.SYS mtop parameter block:
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<a name=table1554></a>
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Offset Size Description (Table 01554)
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00h WORD operation code
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00h "MTWEOF" - write an end-of-file record
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01h "MTFSF" - forward space file
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02h "MTBSF" - backward space file
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03h "MTFSR" - forward space record
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04h "MTBSR" - backward space record
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05h "MTREW" - rewind
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06h "MTOFFL" - rewind and unload
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07h "MTNOP" - perform TEST UNIT READY
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02h DWORD repetition count
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<p>
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Format of ASPITAPE.SYS mtget parameter block:
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<a name=table1555></a>
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Offset Size Description (Table 01555)
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00h BYTE ASPI host ID
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01h BYTE SCSI target ID
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02h BYTE SCSI logical unit number
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03h BYTE device parameters
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<p><b>bit 0:</b><br>Drive must use fixed-block read and write
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<p><b>bit 7:</b><br>Drive is an ASPI device
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04h BYTE current device state <a href="rb-2895.htm#Table1556" tppabs="http://www.ctyme.com/intr/rb-2895.htm#Table1556">(see #01556)</a>
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05h BYTE unit number within driver
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06h WORD fixed block blocksize
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08h BYTE last SCSI status
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09h BYTE last SCSI sense key
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0Ah WORD last SCSI opcode (packed) <a href="rb-2895.htm#Table1557" tppabs="http://www.ctyme.com/intr/rb-2895.htm#Table1557">(see #01557)</a>
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0Ch WORD residual bytes from SCSI opcode
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<p>
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Bitfields for ASPITAPE.SYS current device state:
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<a name=table1556></a>
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Bit(s) Description (Table 01556)
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0 device currently opened in buffered mode
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1 drive currently opened in nonbuffered mode
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2 rewind drive on last close
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3 drive has been written on
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4 drive has been read from
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5 next read will return 0 bytes
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6 EOM will resemble EOF
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7 drive may be busy rewinding
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<p>
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Bitfields for SCSI opcode:
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<a name=table1557></a>
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Bit(s) Description (Table 01557)
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0-7 SCSI operation (SCSI packet byte 0)
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8-10 SCSI flags (SCSI packet byte 1)
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11-12 ASPI "Direction Bits" (ASPI SRB byte 3)
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</PRE>
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<p>
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<b>Category: <a href="cat-008.htm" tppabs="http://www.ctyme.com/intr/cat-008.htm">
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Disk I/O Enhancements</a>
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- <a href="int-21.htm" tppabs="http://www.ctyme.com/intr/int-21.htm">
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Int 21h</a>
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G</a>
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