The following message is a courtesy copy of an article that has been posted to comp.sys.ibm.sys3x.misc,alt.folklore.computers,bit.listserv.ibm-main as well.
Anne & Lynn Wheeler <[EMAIL PROTECTED]> writes: > field/col definition for 12-2-9 TXT card: > > col > 1 12-2-9 / x'02' > 2-4 TXT > 5 blank > 6-8 relative address of first instruction on record > 9-10 blank > 11-12 byte count ... number of bytes in information field > 15-16 ESDID > 17-72 56-byte information field > 73-80 deck id, sequence number, or both > > cols. 2-4 and 73-80 were character ... the other fields were hex. re: http://www.garlic.com/~lynn/2007q.html#69 IBM System/3 & 3277-1 "txt" card decks were nearly executable output from assemblers and compilers. more information about format of other cards in txt card deck http://www.garlic.com/~lynn/2001.html#14 IBM Model Numbers (was: First video terminal?) before i learned about "rep" cards, i would duplicate a "TXT", multipunching the patch/fix into the duplicated card. keypunches just had keys for punching the character information, if you were dealing with hex ... for which there was no equivalent character ... it would be necessary to "multi-punch" to get the correct holes punched. for hex, it was necessary to read the holes ... since even if the card had been "interpreted" ... there were no corresponding character symbols for the majority of the hex codes. my process was to fan the txt card deck ... reading the holes in cols 6-8 (displacement address in the program of data punched in the specific card) ... looking for the card corresponding to the data i needed to patch. I would then take that card and duplicate it out to the cols that needed to be "fixed" ... multi-punch the corrections (in the duplicate/new card) and then resume duplicating the remaining of the card. misc past posts mentioning multi-punch http://www.garlic.com/~lynn/93.html#17 unit record & other controllers http://www.garlic.com/~lynn/2000f.html#75 Florida is in a 30 year flashback! http://www.garlic.com/~lynn/2001b.html#26 HELP http://www.garlic.com/~lynn/2001b.html#27 HELP http://www.garlic.com/~lynn/2001k.html#27 Is anybody out there still writting BAL 370. http://www.garlic.com/~lynn/2001k.html#28 Is anybody out there still writting BAL 370. http://www.garlic.com/~lynn/2002k.html#63 OT (sort-of) - Does it take math skills to do data processing ? http://www.garlic.com/~lynn/2004p.html#24 Systems software versus applications software definitions http://www.garlic.com/~lynn/2005c.html#54 12-2-9 REP & 47F0 http://www.garlic.com/~lynn/2006c.html#17 IBM 610 workstation computer http://www.garlic.com/~lynn/2006g.html#43 Binder REP Cards (Was: What's the linkage editor really wants?) http://www.garlic.com/~lynn/2006g.html#58 REP cards http://www.garlic.com/~lynn/2006l.html#64 Large Computer Rescue http://www.garlic.com/~lynn/2007d.html#51 IBM S/360 series operating systems history http://www.garlic.com/~lynn/2007f.html#78 What happened to the Teletype Corporation? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
