If you had disks or tapes then you also had 60 words of core to use as a buffer.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List <[email protected]> on behalf of Clark Morris <[email protected]> Sent: Wednesday, December 20, 2017 1:07 PM To: [email protected] Subject: Re: Can anyone remember "drum" storage? [Default] On 20 Dec 2017 05:07:26 -0800, in bit.listserv.ibm-main [email protected] (John McKown) wrote: >It's not really a drum, but it is getting closer. Of course, for true >speed, one should go SSD. I remember the IBM 650 which had a 2000 (I think upgradaable to 4000) 10 digit word drum that served as main memory. The instructions were do something with memory and/or an accumulator and jump to the next instruction. Clark Morris > >http://secure-web.cisco.com/1gPYUWCaRzZqc8ichb3Zfl-NPiZpmUYEEIj1NNtyNbzZqHDxjF9-XPt0_J0HVtKYNXJ2ESMgMxBrvuZYQQDE74MRsZKetV7dwfC9qAi14n-wl0vTWPrQARoMVuGT4e9dWrgqbPzAaYVyNOwlSyj1jQsnZIxZo-EBPw-cycCU26x-sAkIAL524chB24KlnLxLRCIPBbVOqRCNiQVblY1M-BVPfyWuaDa5KxN8-esuGHEr5iJn-CzG-L7dlndSdh0t-abmQ3kDDlQ_bU2jqUkloHM4fvlUjdYMVPH6hIDM6GWmz2kgr7Z2QY0c3loRtMINonSrQKGT9NQ-FA-1w6n5L6OpJg6w_4jAGEA76V3QC-DW62b13HIz_HtY8RumGZ1452I_mWFkiHm74i_hR7uX30D5p3W4YORmjg_aBOIsG-j81OAkvuyTrj79EwxlP5kDK/http%3A%2F%2Fwww.theregister.co.uk%2F2017%2F12%2F19%2Fseagate_disk_drive_multi_actuator%2F > >[quote] > >Seagate is increasing IO performance in disk drives by separating >read-write heads into two separate sets which can operate independently and >in parallel. > >The heads are positioned at one end of actuator arms which rotate around a >post at their other end to move the heads across the platter surfaces. >Thus, with an eight-platter drive, each read-write head is positioned above >the same cylindrical track on each platter and reads or writes to and from >the same disk blocks on each platter's surface. > >[\quote] ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
