IBM 2671 Manual Download Page 35 | Manualshive

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Summary of Contents for 2671

Page 1: ...points of specific interest to the following Programmers Operational characteristics including stop conditions addressing recovery procedures and System 360 commands Operators Tape loading unloading r...

Page 2: ...licing Cleaning by Operator and Tape Loading Unloading and Rewinding Because there are five possible configurations of the 2671 the loading instructions have been divided into basic logical steps each...

Page 3: ...Bytes 13 Tape Code Translation 14 Special Tape Code Characters 14 Normal Stop Conditions 14 Character Count Equals Zero or EOR Character 14 Character Count Equals Zero 14 End of Record EOR Detection 1...

Page 4: ...9 Tape Path Cleaning 23 10 Tape Loading Flowchart 26 11 Identification of the Tape Loading Steps 27 12 Step 1 Preparing the 2671 for Loading 29 13 Step 2 Loading Reels onto Supply Feature Clockwise Wo...

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Page 6: ...EMlfcQii iiiiliiiliillii l ll iiii S m m HHH ii IBM i l P fa llll I Frontispiece IBM 2671 Paper Tape Reader and IBM 2822 Paper Tape Reader Control 01769...

Page 7: ...of the code take on mean ing Translation is done by means of a look up table held in the System 360 program The characters transmitted are held by the System 360 in their original code and are only t...

Page 8: ...reader brake are controlled so that when the reader drive is engaged the reader brake is released and vice versa End of Tape Sensor The paper tape passes over the feeler of a microswitch which is the...

Page 9: ...er in the data register is not accepted within the 0 8 millisecond period the 2671 stops immediately on the character not yet read Such a stoppage is called channel contention Delete Character Detecti...

Page 10: ...itch is set off interlocks are provided to stop the power being turned on and off locally The power on and reset pushbutton however retains the reader reset function even when the power on function is...

Page 11: ...hole When the delete switch is pushed up all delete characters read are auto matically suppressed in the 2822 and are not transmitted to System 360 When the delete switch is pushed down the delete cha...

Page 12: ...switch is set to REMOTE the power off if in local pushbutton does nothing and power can only be removed under control of System 360 The change from local to remote powering and vice versa can only be...

Page 13: ...nd of the time allowed approximately 0 8 seconds a timeout condition occurs and the equipment check lamp turns on The 2671 stops and the ready lamp stays on Any of the following con ditions can cause...

Page 14: ...This switch is set when the supply clutch lever is perpen dicular to the supply stacker and is set off when the supply clutch lever is in line with the supply stacker When on the switch allows the sup...

Page 15: ...the transfer of data to the buffer as follows Tape Width Lever Setting Tape Width Transferred Tracks 8 1 inch 1 to 8 6 7 7 8 inch 1 to 6 7 5 11 16 inch 1 to 5 Turntable Key The turntable key is spring...

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Page 17: ...at full speed 1 000 characters per second 25 per cent variation the request in line is activated every 0 8 milliseconds So that 2671 may operate contin uously a data character must be accepted by the...

Page 18: ...e is issued by the 2671 to reject the first command following the end of the last tape of a file end of file lamp on The status of the 2671 becomes not ready after issuing this status byte Busy and De...

Page 19: ...se byte Bit Condition 0 1 2 3 4 5 6 7 Command Reject Intervention Required Bus Out Check Equipment Check Data Check Not used Not used Not used These conditions are reset at the beginning of the next r...

Page 20: ...mmands the 2671 stops at each EOR character None of the EOR characters is transmitted to the channel If the 2671 is operating under the control of unmodified read commands the 2671 stops only when the...

Page 21: ...mum speed of the tape reader 1 000 characters per second can only be maintained if the System 360 channel is available to handle the characters at this rate No operator intervention is required Data C...

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Page 23: ...drive clutch it will always require inter vention by the IBM customer engineer Each time an overstep condition occurs the overstep lamp lights and the ready lamp is off regardless of the state of the...

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Page 25: ...titute part of the data character The feed holes however are detected to control the supply of tape into the supply stacker if supply feature fitted The absence of feed holes causes the 2671 to stop 0...

Page 26: ...paper that are punched out of the tape Paper Tape Handling The 2671 can read the same piece of paper tape at least 30 times without significant damage to the tape The loading time for a strip of tape...

Page 27: ...o o oof o o o o oooio o o o o oo oo o o o o o o o o o o o o o o o o o o o o o o o o l oo o o o o oo o o o o o o o o o o o o o BUTT JOINT SPLICE The butt joint splice Figure 8 is made by butting two c...

Page 28: ...ickness of the splice must not exceed 0 010 in 2 The width of the splice must match the width of the tape 3 The splice must be approximately as strong as the IBM paper tape 4 The splice must be flexib...

Page 29: ...plastic covers in position remove the covers 2 Blow out all dust and chads 3 Resecure the clear plastic covers CLEANING READ HEAD To clean the read head CAUTION Do not touch anything under the covers...

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Page 31: ...rself com pletely with the instructions given in this section and obey them completely In particular always load tape into the 2671 three hole side down For tape punched with six tracks the three hole...

Page 32: ...re to be followed for your type of machine refer to Figure 11 where each configuration of the 2671 is given together with the appro priate step numbers The procedure for making the 2671 ready depends...

Page 33: ...ps I I 1 1 1 1 6 7 and 9 or 10 with Center Roll Feature I 1 1 o 1 1 I 1 3 4 6 7 and 9 or 10 n ith Center Roll Feature ar o1 1 id Take Up Feature o 1 1 1 1 3 4 6 8 and 9 or 10 2671 Steps 2671 Steps wit...

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Page 35: ...act the tape guides c Set the tape width selector to the correct setting according to type of tape used Tape Width Lever Setting 8 6 7 5 Tape Width 1 inch 7 8 inch 11 16 inch Right Hand Top Key Cj 4 a...

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Page 37: ...e shaft attached to the inside of the top cover c Place the tape reel over the hub three hole side down i 2 inch Hub Hold the tape trailer against the hub and rotate the hub four or five times in the...

Page 38: ......

Page 39: ...and Counterclockwise Wound Tape 08276 of the trip roller Figure 15c Feed the tape leader around the front of the trip roller Feed the tape leader back under the clip on the upper tapered guide Pull a...

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Page 41: ...und the supply stacker guide and pull the tape leader clear of the supply stacker CAUTION Item d is mandatory If this item is not done the tape will be broken or torn d Turn the supply clutch lever so...

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Page 43: ...17 so that the tape is diverted to the front of the 2671 Note In this position the tab operates the take up switch to prevent the take up motor from running Take Up Stacker Guide Rotating Tab Figure 1...

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Page 45: ...eration b Make sure that the tape is seated on the bottom tape guides then press the left hand top key to reset the retractable tape guides c Check that the retractable tape guides have cleared the to...

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Page 47: ...sition the tape basket see Specification of Tape Basket in Introduction in front of the 2671 and directly below the end of record switches b Guide the paper tape into the basket by hand Tape Loading U...

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Page 49: ...the left to right behind one of the pins immediately in front of the tape clamp Figure 19c f Check that the tape is resting on the surface of the reel then close the tape latch handle to secure the ta...

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Page 51: ...1 with the top cover shut to keep out any room dust Step 10 Reading Local Powering a Push the top cover shut except when strip feeding b Press the power on and reset pushbutton c Set up the EOR charac...

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Page 53: ...no longer required for use Press the power off in local pushbutton the lamp in the power on and reset pushbutton will go out REWINDING INSTRUCTIONS If the center roll feature is fitted there is no ne...

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Page 55: ...rd I O channel interface to data traffic Delete Character All tracks punched whether 5 6 7 or 8 in number made during punching by adding the necessary additional holes to a wrongly punched character E...

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Page 57: ...equals zero 14 character delete 14 end of record 14 character punching mistake 14 check data lamp 7 check equipment lamp 7 cleaning 23 clutch reader drive 2 supply 8 clutch lever supply 8 code transl...

Page 58: ...ke up 8 N none parity 6 nonprocess runout NPRO 6 nonprocess runout pushbutton 6 NOP no operation return of channel end and device end 12 normal stop conditions 14 through 15 NPRO nonprocess runout 6 N...

Page 59: ...rotating tab 8 setting of 37 runout nonprocess 6 select out bypass 11 select out line 11 selection controls interface 11 selective reset stop 17 selector take width 9 sense bit 0 12 sense bit 1 12 sen...

Page 60: ...ntrol unit 2822 3 through 4 tape guides 1 8 tape jam 7 tape loading backspace 15 tape reels clockwise wound loading 33 counterclockwise wound loading 33 tape rewinding 6 tape width lever 9 tape width...

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Page 62: ...g Division 1133 Westchester Avenue White Plains New York 10604 U S A only IBM World Trade Corporation 821 United Nations Plaza New York New York 10017 International CD 135 C O NO CO rO o o 3 CO CO c C...

Page 63: ...t handling of such requests please contact your IBM representative or the IBM Branch Office serving your locality Possible topics for comment are Clarity Accuracy Completeness Organization Index Figur...

Page 64: ...s become the property of IBM r Fold Fold mm International Business Mai Data Processing Division 1133 Westchester Avenue U S A only IBM World Trade Corporat 821 United Nations Piaza International Busin...

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