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4144 Rev. 2 UP.NUMBER Format: L,U AO,pktaddr ER 10XI$ This linkage may be generated by the procedure call: Descr i pti on: I$OXI pktaddr UNIVAC 1100 SE RI ES SY STEMS 6-10 Pktaddr is the address of the I/O packet (see Figure 6-1) which controls all I/O device handler operations. 6.3.8. REDUCING INTERRUPT ACTIVITY PRIORITY (UNLCK$) Purpose: Allows an interrupt activity to reduce its priority. Format: Description: ER UNLCK$ PAGE REVISION PAGE The UN LCK$ request enables an I/O interrupt activity to reduce its switching priority to the priority of the activity which initiated the I/O request. Any other executive request executed by the interrupt activity has the same result. However, in a time critical, multiactivity program, the UNLCK$ request provides a low overhead means of level reduction. 6.4. MAGNETIC TAPE HANDLER 6.4.1. TAPE HANDLER FUNCTIONS The various magnetic tape functions (see Table 6-2) are controlled by a routine that is always located in main storage. The current position of each tape is kept in terms of a block count and is made available for error logging, checkpoint, and ending label routines. No provision is made for automatic treatment of mixed parity and mixed density tape files. Utilization of the contingency write and skip write functions are automatically provided by the handler, and unless the user provides his own error recovery, these functions should not concern the user. In order to use the handler, an I/O control packet must be generated (see 6.2). Function Symbol Octal Code Description Write W$ 10 Starting at the address in H2 of word 4 of the I/O packet, transfer the number of words specified in H 1 of word 4 to form a single block on magnetic tape. Transfer is accomplished according to the standard modes or the requested modes, that is, parity, density, and so forth. Normal completion resu Its when all words have been transferred, except for UNISERVO VI·C/VIII·C tape units, seven·track format, even parity, where a character of zero, after translation is requested, will conclude the request for more data by the subsystem. Table 6-2. Magnetic Tape I/O Functions and Codes (Part 1 of 2)
4144 Rev. 2 UNIVAC 1100 SERIES SYSTEMS 6-11 UP-NUMBER PAGE REVISION PAGE Function Symbol Octal Code Description Write end of file WEF$ 11 Write a sentinel on magnetic tape which, when read, results in an EOF status being returned to the program. Contengency write CW$ 12 Write zeros, in even channels only, for 2.5 inches of tape to allow writing after reading forward (UN ISERVO III-A tape units only). This function is automatically provided by the system and should be of no concern to the user unless the suppress recovery mode is employed. Skip write SW$ 13 Erase three inches of tape, then the same as a write function. This function is automatically provided in the system for write parity recovery. Required for the suppress recovery mode or if an extended interblock gap is needed on compatible tape types. Gather write GW$ 15 Write a single block on magnetic tape specified by a string of access words. The number of access words is specified in H 1 of word 4 and the starting address of the string is specified in H2 of word 4. Read forward R$ 20 Initiate tape motion in the forward direction and transfer the words read into the area defined by word 4 of the packet. Transfer is normally concluded by either encountering the end of block or transferring the number of words requested. Read backward RB$ 21 Same as read forward except opposite direction. Move forward MF$ 50 Move tape forward one block. Move backward MB$ 51 Backspace the tape one block. Forward Space File FSF$ 52 Move tape forward past the next EOF mark. This function is available only on the UNISERVO 12/16 tape units. It returns an EOF status if the end of the tape is not encountered. Backspace File BSF$ 53 Move tape backward past the previous EOF mark. It returns an EOF status if the beginning of the tape is not encountered first. Rewind REW$ 40 Reposition the tape at the load point. This is the point at which a read forward reads the first block on tape and a read backwards reports an end-of-tape status. Rewind with interlock REWI$ 41 Reposition the tape to unload point and lock the unit against further functions Set mode SM$ 42 Set operating mode function (see 6.4.1.1 ). Scatter read forward SCR$ 43 Same as read forward except the words read are transferred into areas specified by a string of access words defined by word 4. Scatter read backward SCRB$ 44 Same as scatter read forward except opposite motion direction. Table 6-2. Magnetic Tape I/O Functions and Codes (Part 2 of 2)
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4144 Rev. 2 UP-NUMBER UN I V A C 11
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4144 Rev. 2 UP-NUMBER ER Name ABORT
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4144 Rev. 2 U P·NUMBER UNIVAC 1100
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4144 Rev. 2 U P.NUMBER UNIVAC 1100
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4144 Rev. 2 UP.NUMBER 17.4. CHECKPO
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4144 Rev. 2 UP-NUMBER Format Parame
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4144 Rev. 2 UP.NUMBER LNQU ICK num
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4144 Rev. 2 UP-NUMBER 19.1. INTRODU
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4144 Rev. 2 UP.NUMBER 20.B. EXAMPLE
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4144 Rev. 2 UP.NUMBER Status Codes
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4144 Rev. 2 UP.NUMBER High Speed Pr
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4144 UNIVAC 1100 SERIES SYSTEMS UP-
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