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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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Residual Address. The address of <strong>the</strong> last data location accessed by <strong>the</strong> initiateI/0 command.Normal Interrupt Indicator. Bit 0 is set to 1 after <strong>the</strong> card has been read andan interrupt is <strong>about</strong> to be sent to <strong>the</strong> <strong>System</strong>/7.Attention Interrupt Indicator. Bit 0 is set to 1 as a result of <strong>the</strong> 2502 goingready from <strong>the</strong> not ready state.Interrupt PresentationThe 2502 Attachment can interrupt on level 3 sublevel 1 or level 1 sublevel 1. Thelevel and displacement are controlled by wiring chosen at initial installation andcannot be altered by programming. When <strong>the</strong> processor services <strong>the</strong> interrupt request,<strong>the</strong> 2502 Attachment presents a device address of 011100.Device Not Ready. The read commands result in an interrupt presentation withbits 2 and 3 on in Status Word 1.Not Attached/Offline. When <strong>the</strong> 2502 attachment is under control of <strong>the</strong> CEPanel or power to <strong>the</strong> 5024 is off, code 3 is returned in response to an initiate I/Ocommand.Operating and Program RestrictionsCards are placed in <strong>the</strong> hopper, 9 edge first and face down. Pressing <strong>the</strong> start key on<strong>the</strong> 2502 signals <strong>the</strong> control unit that <strong>the</strong> 2502 is ready to feed cards. The controlunit initiates a feed cycle, feeding a card from <strong>the</strong> hopper to <strong>the</strong> preread station.The control unit makes <strong>the</strong> card reader ready and indicates this condition by sending anattention interrupt to <strong>the</strong> <strong>System</strong>/7, if attention interrupt is enabled.Timing I nformationThroughput speed is 300 cards per minute. <strong>System</strong> decision time to maintain thisthroughput is 50ms. Slower speeds may result dependent on <strong>the</strong> rate that I/O commandsare issued by <strong>the</strong> using program.If a read request is not received in 30 seconds, <strong>the</strong> attachment will stop <strong>the</strong>motor (time out). The reader will remain ready, and <strong>the</strong> attachment will start <strong>the</strong>motor again when a read request is received. A time delay of 600ms is required tobring <strong>the</strong> motor up to speed.Power Transitions and ResetsIf <strong>the</strong> 2502 is in <strong>the</strong> ready condition when a power interruption occurs, <strong>the</strong> readycondition is dropped and manual intervention is required to restore <strong>the</strong> ready state.<strong>IBM</strong> 5024 I/O Attachment Enclosure 17-15

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