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IBM System/7 Functional Characteristics - All about the IBM 1130 ...

IBM System/7 Functional Characteristics - All about the IBM 1130 ...

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Bit 6-Reserved.Bit 7-Parity 1. This bit is used to maintain even parity in <strong>the</strong> high order byte of this controlword.Bit 8-Set ASCII Mode. Setting this bit on allows communication using ASCII code. Whenoff, <strong>the</strong> BSCA recognizes EBCDIC code.Bit 9-Reserved.Bit 10-Start 2-second Timer. This bit is used to start a 2-second interval after which <strong>the</strong>BSCA interrupts. Timeout (bit 3) in <strong>the</strong> ISW is not set on.Bit 11-Start 3-second Timer. This bit is used to start a 3-second interval after which <strong>the</strong>BSCA interrupts. Timeout (bit 3) in <strong>the</strong> ISW is not set on. This bit may also be usedwith bit 0 and/or with bit 4 to limit time.Bits 12, 13, and 14 Reserved.Bit 15-Parity 2. This bit is used to maintain even parity in <strong>the</strong> low order byte of thiscontrol word.Following are <strong>the</strong> valid bit combinations for use in word 3. A parity error detected inword 3 causes an interruption, setting on bit 1 (command reject) in <strong>the</strong> ISW. Correct(even) parity in word 3 with an invalid bit combination causes unpredictable results.General Control FunctionsHex Function0900 Enable0911 Enable with 3-second timeout0500 Disable0021 2-second timeout0011 3-second timeoutEBCDIC Control FunctionsHex Function8100 Receive8111 Receive with 3-second timeout2100 Transmit1100 Transmit in transparent text modeASCII Control FunctionsHex Function8181 Receive8190 Receive with 3-second timeout2181 TransmitDCB Word 4 (Chain address)This word contains <strong>the</strong> address of <strong>the</strong> DCB to be used (chained to) when <strong>the</strong> current bytecount is decremented to 0 or a COD character is recognized, and <strong>the</strong> chaining flag(bit 1) is on in word 5.DCB Word 5 (Chaining flag)Bit 0-Reserved. This bit is not used by <strong>the</strong> BSCA but must be set to 0.Bit 1-Chaining Flag. When on, this bit indicates that word 4 contains <strong>the</strong> address of <strong>the</strong>chained-to DCB.Bits 2-15. Not used by <strong>the</strong> BSCA but must be 0.Binary Synchronous Communications Adapter 8-7

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