BUFFER I/O Path Registers
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All registers can be read with the STATUS command. The following registers can be set with the CONTROL command: 3, 4, 5, 8, and 9.
0 - ASSIGN status: 0 - not assigned, 3 - assigned to a buffer
1 - Buffer named flag: 1 - named, 2 - unnamed
2 - Buffer size in bytes
3 - Current fill pointer
4 - Current number of bytes in buffer
5 - Current empty pointer
6 - Interface select code for in-coming TRANSFER
7 - Interface select code for out-going TRANSFER
8 - Continuous in-coming TRANSFER flag: zero - not continuous, non-zero - continuous
9 - Continuous out-going TRANSFER flag: zero - not continuous, non-zero - continuous
10 - In-coming TRANSFER status
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Bit
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Value
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Meaning
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7
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128
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Always 0
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6
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64
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Active
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5
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32
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Aborted
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4
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16
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Error
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3
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8
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Device caused termination
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2
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4
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Byte count caused termination
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1
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2
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Record count caused termination
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0
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1
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Match char caused termination
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11
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-
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Out-going TRANSFER termination status. Same meaning as above
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12
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-
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Count of bytes transferred by last in-coming TRANSFER
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13
|
-
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Count of bytes transferred by last out-going TRANSFER
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