edgould1...@comcast.net (Edward Gould) writes: > It addressing had MMBBCCHHR(R?) so I guess you could address it > directly. Anyone remember how to do that? (progr5amming for a 2321 is > a lost art (where is Seymour?).
the "BB" was to select the BIN that the magnetic strips were located in. https://www-03.ibm.com/ibm/history/exhibits/storage/storage_2321.html and https://en.wikipedia.org/wiki/IBM_2321_Data_Cell Generically, at the OS level, IBM defined the six bytes as BBCCHH, for Bin, Bin, Cylinder, Cylinder, Head and Head respectively. ... snip ... referenced from: http://www.bitsavers.org/pdf/ibm/360/os/R21.7_Apr73/GC28-6628-9_OS_System_Ctl_Blks_R21.7_Apr73.pdf the bins (cells) rotated under the r/w heads. https://www-03.ibm.com/ibm/history/exhibits/storage/storage_PH2321B.html http://www.computer-history.info/Page4.dir/pages/Photostore.dir/images/Picture.1.jpg as undergraduate, univ. hired me as fulltime support for the production ibm systems. the univ. library got an ONR grant to do online catalog ... and used part of the money to get a 2321 datacell. The project was also selected to be one of the original CICS product betatest sites and I got tasked with debugging/supporting CICS (one of the "bugs" was that CICS original implementation at customer site used specific set of BDAM options which was hardcoded in the source ... and the library had chosen a different set of BDAM options ... it took some dump analysis to discover the issue since it wasn't documented). -- virtualization experience starting Jan1968, online at home since Mar1970 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
