mitchd...@gmail.com (Dana Mitchell) writes: > 4331 had integrated disk and communication adapters built in, no 3274, > 3705, 3880 controllers required. Later machines just had parallel > channels just sort of built in, not really on cards. 3090 was first > with ESCON
re: http://www.garlic.com/~lynn/2017d.html#1 GREAT presentation on the history of the mainframe "4331" was "boeblingen" machine, like 115&125, with integrated channels & integrated controllers http://www.garlic.com/~lynn/2017c.html#86 GREAT presentation on the history of the mainframe http://www.garlic.com/~lynn/2017c.html#95 GREAT presentation on the history of the mainframe ... while "4341" was "Endicott" machine, with integrated channels like 370/158 ... however 4341 was faster than 158&3031 ... and 4341 integrated channels were much faster than 158 integrated channels (158 integrated channels was also used as external channel for all 303x processors). 4341 integrated channels were so fast that with slight tweak ... they could be used for 3380 3mbyte/sec testing. http://www.garlic.com/~lynn/2017c.html#80 Great mainframe history(?) http://www.garlic.com/~lynn/2017c.html#87 GREAT presentation on the history of the mainframe past posts getting to play disk engineer in bldgs14&15 htttp://www.garlic.com/~lynn/subtopic.html#disk mid-range disks for 4331&4341 were FBA (3310 & 3370) .... also low environmentals so straight-foward to deploy in non-datacenter environments. https://www-03.ibm.com/ibm/history/exhibits/storage/storage_3370.html https://www-03.ibm.com/ibm/history/exhibits/storage/storage_3370b.html high-end datacenter disks were 3380 3mbyte/sec, still CKD ... but small fixed cell size (for things like error correcting) ... so record lengths had to be rounded up to cell size ... for determining records/track. As POK favorite son operating system continued to fail to deploy FBA support ... and all physical disks moved to industry standard fixed-block, CKD became an legacy anachronism, all simulated on industry standard fixed-block disks (decades after CKD stopped being built). past posts http://www.garlic.com/~lynn/submain.html#dasd -- 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
