paulgboul...@aim.com (Paul Gilmartin) writes: > But doesn't PDSE emulate FBA under CKD emulated on RAID > implemented on FBA? Even as VM/CMS emulates FBA for MDFS.
CMS has been logical FBA (on real CKD) all the way back to cp40/cms ... when it was originally developed ... and was called cambridge monitor system and could run stand-alone on a real 360/40 ... cambridge had done hardware modifications to 360/40 to support virtual memory ... for development of cp40. I was recently sent scan copy (by the author) of cp40 presentation given at 1982 SEAS meeting (european share) ... which I ocr'ed http://www.garlic.com/~lynn/cp40seas1982.txt when 360/67 became available (with virtual memory standard), cp40 morphed into cp67 http://www.bitsavers.org/pdf/ibm/360/cp67/ later when virtual memory became available on 370, cp67 morphs into vm370 and "cambridge monitor system" morphs into "conversational monitor system" (and ability to run on "real" hardware was crippled) http://www.bitsavers.org/pdf/ibm/370/vm370/ when disk division announces real FBA (3310 & 3370) disks, it is very straight-forward for CMS to support: http://www-03.ibm.com/ibm/history/exhibits/storage/storage_3370.html this also shows up in the 3090 service processor, 3092 ... http://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP3090.html at the bottom mentions 3092 requiring two 3370s ... 3092 is actually a pair of vm/cms 4361s running custom modified version of vm370 release 6 ... a couple old emails (3092 was originally developed on 4331): http://www.garlic.com/~lynn/2010e.html#email861031 http://www.garlic.com/~lynn/2010e.html#email861223 it wasn't too long before real CKD were no longer manufactured ... CKD becoming an obsolete technology simulated on real FBA. various past posts on the subject http://www.garlic.com/~lynn/submain.html#dasd past posts mentioning cambridge science center (formed 1Feb1964) http://www.garlic.com/~lynn/subtopic.html#545tech -- virtualization experience starting Jan1968, online at home since Mar1970 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: INFO IBM-MAIN
