First, my experience is limited to Holerith (80 column) cards; no 90 column or 96 column cards.
Before S/360 there were several different encodings, both as to what hole combinations corresponded to what characters and as to what characters corresponded to what numbers. The decimal machines used 2 digit numbers for characters and the binary machines used 6 bit numbers. Roughly speaking there were two character sets: commercial and scientific. The commercial character set had Per Cent and Lozenge for the same punch combinations that were Parentheses in the scientific character set. When IBM introduced S/360, the card equipment could handle either EBCDIC or column binary. There was never a S/360 card reader that was limited to 6 bit characters. Unless the JCL for the Reader/Interpreter specified column binary, which would not work (it required keywords in the range C1-E9), instream data could include any of the 256 EBCDIC characters. Yes, there was a time when you couldn't have a delimitor card in an instream data set, but IBM added a DLM keyword to the DD statement in OS/360 (I don't remember the release.) This was well before JES2 and JES3. Q!: the input was limited to the punched card character set because that character set included all 256 8 bit values. Q2:: The mapping from hole combinations to 8 bit values was always the same. There were several different EBCDIC code pages. There really was no character set for card equipment on S/360; only when the 3525 introduced printing on the card being punched did character set become relevant. There were names for print chains, print trains and UCS images. -- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of R.S. [r.skoru...@bremultibank.com.pl] Sent: Tuesday, June 2, 2020 10:19 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Punched cards and character set I have never used punched cards, so forgive me my questions. As far as I know, a character set on punched cards was somehow limited, so it is not EBCDIC or similar set of 256 characters. Of course that means some limitations for DD * datasets - if coded on real punched cards. Nowadays I'm pretty sure DD * accept every possible character, as any other dataset (with some exception for delimiter). Note, it is program independent - this is a change within system (JES2, Interpreter, whatever). Q1: how it was in the past? I mean, were the DD * limited to "punched card" character set? Or it was always full EBCDIC if the job was read from DASD? Q2: What about character set on the cards? Was it always one and the same within S/360 family? I noted there were several character sets, but as far as I understand those set was for other machines (Remington, pre-S360 IBM machines, etc.) Was there any name for card character set? I mean something like "CP 037" or so. And another question, or rather kind request: Does anynone have JCL statements on punched cards? I would like to get/download some images of JOB, EXEC, and DD statements on punched cards. I have a lot of card pictures, but none with JCL. -- Radoslaw Skorupka Lodz, Poland ====================================================================== Jeśli nie jesteś adresatem tej wiadomości: - powiadom nas o tym w mailu zwrotnym (dziękujemy!), - usuń trwale tę wiadomość (i wszystkie kopie, które wydrukowałeś lub zapisałeś na dysku). 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