etc., are discussed in detail in IBM Component Description: 3505 Card vertical mark columns to storage. Thus, a three-character vertical mark field in card columns 1 to 6 appears in positions 1 to 3 of the sequence must be maintained.
A vertical mark field must not contain any punches or nonreflective necessity of an electrical or communications hookup
• An unlimited number of people can record data simultaneously
Either the 3525 Punch Adapter or the 3525 Read Punch Adapter and the Special Feature Adapter must be installed on the 3505 in order to attach a model of the 3525 Card Punch to a system channel. These features can be field installed. Models P1, P2, and P3 of the 3525 differ only in speed, and model changes can be made in an installation.
Any 3525 model can be combined with either 3505 model.
The I/O commands used for the punch side of the 2540 without punch feed read capability are a compatible subset of those provided for the 3525. (The special punch feed read command defined for the 2540 is not used on the 3525 and i t will cause a command reject error on the 3525.) Additional commands for the 3525 support new features such as card printing and read column eliminate. Since a 3525 with the Card Read feature installed can execute the same commands as the 3505 reader (all features except optical mark reading), the 3525 can be used as a second or a backup card reader, if necessary.
In the 3525, cards move from the hopper to a parallel read station (dummy if the Card Read feature is not installed) and on to a parallel punch station at which punch checking occurs. Then cards move to a parallel print station (dummy if a card print feature is not installed), after which they are stacked into one of two standard 1200-card-capacity stackers under program control. Thus, reading, punching, and printing can occur for each card during one pass, a facility not available on other card units for System/310 models or on card units for System/360 Models 30 and up.
Card feeding on the 3525 is handled by picker knives as on a 2540 because this technique is required for parallel card reading operations when an additional aligning station is not used. Parallel rather than serial feeding is used in the 3525 to obtain the punch speeds available.
As on a 3505, the entire card path in the 3525 can be exposed quickly if a card jam occurs.
A new method of punch checking, which senses punch displacements, is implemented in the 3525. Punch checking is achieved by monitoring the actual motion of each punch. The control unit compares the output from the sensors attached to each punch to the data sent to be punched and determines whether holes were actually punched and, if so, punched correctly. Each card is also checked for correct position and skew to ensure punch registration accuracy.
A significant new recovery feature of the 3525 is automatic punch retry when combined read/punch operations are not being performed.
(Punch retry is effective during punch/print operations.) When a punch error is detected, the control unit directs the error card to a 200-card-capacity dedicated error stacker (stacker 3) located under the covers of the 3525 and causes the output data in the buffer to be repunched into the next card. If the retry is successful, the
correctly punched card is sent to the error stacker and the stacker 3 light is turned on to indicate to the operator that cards are in the error stacker. (A correctly punched card is placed in the error stacker so that the customer engineer can compare i t with the incorrectly
punched card, which can be useful in identifying the punch malfunction.) Another card is then punched with the same data and stacked, after which normal operations continue. These punch retry operations are controlled entirely by the control unit. Therefore, punch retry is transparent to the channel and the program and does not require operator intervention. If a single punch retry is unsuccessful, punching stops and an error condition is indicated. When the operator runs out the cards, the second error card is placed in stacker 1.
Because of the way in which punch retry operates, punching into
prepunched or serially numbered preprinted cards should not be attempted unless the Card Read feature is present. A combined read/punch
operation must also be defined so that a READ followed by a WRITE AND FEED command sequence is issued by data management. This sequence causes punch retry to be bypassed if a punch error occurs. otherwise, when a punch retry occurred, data meant to be punched only in card N would also be punched into cards N+1 and N+2, and card N+1 would be placed in the error stacker.
The optional card Read feature (field installable) for the 3525 provides column binary operations as a standard feature and offers a function not available with the Punch Feed Read feature for the 2540.
Read column eliminate, as already described for the 3505, is standard on a 3525 with the read feature. Therefore, perforated or internally scored cards can be read from a 3525 as well as from a 3505. In addition, cards are read optically on the 3525, and thus offpunching and rnisregistration of cards are not as significant a factor in successful card reading as they are when read brushes are used.
Either the Two-Line Card Print or the Multi-Line Card Print optional feature can be installed on the 3525 in additio~ to the options already discussed. Either the 3525 Two-Line Print Control or the Multi-Line Print Control feature and the Special Feature Adapter are required on the 3505 as well. The card print features are mutually exclusive and not recommended for field installation; however, a change from either feature to the other can be made at the installation.
Engraved type slugs, similar to those used on a 1403 Printer, are used in the print cartridge assembly in contrast to the wire matrix technique used in the 2560 Multi-Function Card Machine. The cartridge assembly provided for the 3525 contains 64 characters and an
installation can order one of two character sets, EBCDIC (63 characters including blank) or ASCII (64 characters including blank). If the ASCII cartridge is used, the program is responsible for providing ASCII encoded data in storage (that is, the control unit will not convert EBCDIC mode data from storage to ASCII mode for printing),. Black and purple ink ribbons are available.
The Two-Line Print feature provides the 3525 with the ability to print two lines of data on a card, up to 64 characters in length,
during a single pass. Card throughput for two-line printing operations equal to the rated punch speed of the 3525 model can be obtained--l00, 200, or 300 cpm. The first line of print is located along the top edge of the card and the second is between punch rows 12 and 11. This corresponds to lines 1 and 3 when 25 lines are used, as shown in Figure
20.25.4.
The Multi-Line Card Print feature permits the 3525 to print up to 25 lines on a card, 64 characters in length, during a single pass.
Print lines are shown in Figure 20.25.4. They are .125 inches apart, and identical in location to the 25 line locations defined for card printing using the 2560 MFCM. The lines printed on any given card are determined by programming. A print line command supplies the number of the line on which printing is to occur as well as the data to be printed and normally causes the card to be pOSitioned in the print mechanism at the line indicated. Thus different lines can be printed on different cards. (Note that lines must be printed in
ascending line number sequence and thus a given line cannot be printed on twice in one pass.) For both card print features, the data printed on each line must be supplied by the program and can include data read from a prepunched card (if the read feature is present). There is no limit to the time taken between print commands.
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