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IBM 7074, General Information Manual

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Summary of Contents for 7074

Page 1: ......

Page 2: ...General Information Manual IBM 1301 Disk Storage with IBM 7000 Series Data Processing Systems...

Page 3: ...scribed in a separate IBM 1301 Disk Storage bulletin for each system Information common to 7000 systems in the operation of the 1301 Disk Storage and the 7631 File Control has been included in the Ope...

Page 4: ...k Recording 5 Functions 9 Operations 10 Control 10 Sense 12 Write 13 Read 15 Checking 16 Shared System Operation 17 Instruction Times 18 Access Motion Time 18 Control Panel 20 Power On Switches and Li...

Page 5: ...IBM 1301 Disk Storage...

Page 6: ...odel 1 for use with a 1410 system Model 2 for use with a 7000 system 7070 7074 7080 7090 Model 3 for shared use with a 7000 system and a 1410 system Model 4 for shared use with two 7000 systems Magnet...

Page 7: ...a of the other ten surfaces six are used as alternate surfaces one is a format surface one is a clock surface Figure 3 The other two are not used The data storage surfaces and the format surface each...

Page 8: ...ex Point HA 1 GAP Figure 5 Track Layout HA 2 GAP Record Address 1 GAP Also with the track number known the cylinder number and head number can be determined by dividing the track number by 40 the quot...

Page 9: ...he 250 cylinders requires that a new format track be written for that cylinder The data used to create a format track must first be organized in core storage as a data record Pro gramming is used to t...

Page 10: ...ion code only Figure 7 shows the make up of the order Orders are transmitted from the computer s data channel as BCD characters The 7631 File Control accepts the digit portion of the first eight chara...

Page 11: ...l the release order is issued permitting the file control to be available for either system Eight Bit Mode DEBM 08 This order requires only the two digit operation code The order conditions the file c...

Page 12: ...e address This order instructs the file control to do the fol lowing l Select the desired module and access mechanism 2 Supply the home address to be verified 3 To receive or transmit only the records...

Page 13: ...s the file control to trans mit status data to the computer to indicate error and unusual conditions as well as attention conditions This operation is similar to a read command except that only the te...

Page 14: ...are to be used to define the related areas for the associated data tracks When laying out a format track the following con siderations must be given Format Track Capacity The maximum character positi...

Page 15: ...of the track 14 Write Track with Addresses Operation Conditions necessary for this operation are a prepare to verify track with addresses order followed by a write command Under control of the prepare...

Page 16: ...ut if reading file con trol continues to read to end of record and then com pares check characters if writing the file control writes blanks to end of record then writes the check characters No wrap a...

Page 17: ...L or UNUSUAL END at that time A STOP signal prior to the logical end of this operation will cause the 7631 to stop data transmission and to signal a NORMAL END at the end of the record Read Track with...

Page 18: ...Circuit Cbeck This check occurs due to malfunctioning of the gap detection circuit address comparison circuit or the check character code generator in the file control Shared System Operation The 763...

Page 19: ...then a release b System B issues one or more seek commands and then a release c Control of the 7631 is now logically discon nected from both systems Operation from this point depends on which systems...

Page 20: ...3199 3200 3599 3600 3999 III III 4000 4399 Q 6 tJ 4400 4799 4800 4999 u 5000 5199 c 5200 5599 g 5600 5999 6000 6399 6400 6799 6800 6999 7000 7199 7200 7599 7600 7999 8000 8399 8400 8799 8800 8999 900...

Page 21: ...o on Power On Light when on indicates that power is supplied to the 7631 and the 1301 s 20 Power Off Key removes DC and AC operating voltages from the 7631 and the 1301 s and initiates a power off seq...

Page 22: ...ress For the 7070 7074 the control command must spec ify two alpha order words for the seek For example RDWC 40 2 5 6 9 where 2 5 contains the address of the first order word and 6 9 contains the addr...

Page 23: ...waiting loop 2 Type of Error read write write check or control 22 3 Unit Involved access number module number track number 4 File Control Status Word bytes 0 4 inclusive an examination of byte 0 will...

Page 24: ...11 62 7 5M FW 28...

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