The following message is a courtesy copy of an article that has been posted to bit.listserv.ibm-main,alt.folklore.computers as well.
Anne & Lynn Wheeler <[email protected]> writes: > from long ago and far away (mentions dumprx, vm370 rel6 sepp, and the > 3090 service processor): > > Date: 31 October 1986, 16:32:58 EST > To: wheeler > > Re: 3090/3092 Processor Controll and plea for help re: http://www.garlic.com/~lynn/2010e.html#email861031 in http://www.garlic.com/~lynn/2010e.html#32 Need tool to zap core funny thing about the wording in the above email was that neither the person writing the email nor his immediate management seemed to have realized that I had helped the manager that started the vm service processor for 3090 (i.e. turnover and/or transient nature of the positions). the issue with the 3081 service processor was that a whole bunch of stuff had to be created from scratch (roll-your-own operation). recent post mentioning 3081 service processor http://www.garlic.com/~lynn/2010d.html#43 What was old is new again (water chilled) the trade-off was having a more sophisticated environment for service processor operation but having to invent/develop everything from scratch ... vis-a-vis having an off-the-shelf more sophisticated infrastructure that might possibly have some things that weren't absolutely required. 3090 service processor was getting to the point where it wasn't practical to be inventing/developing everything from scratch. one of the funnies in the 3081 service processor was that its disk drive was 3310 FBA (versus the 3370 FBA used by vm for 3090) ... and the 3081 service processor needed to do paging operations. the 3081 didn't have enough storage for all the microcode ... so there were some 3081 operations that involved the service processor doing microcode paging from the 3310 FBA device. the 3090 engineers would point out that some performance differences between 3081 and 3090 ... was there weren't any critical performance paths that required paging microcode. -- 42yrs virtualization experience (since Jan68), online at home since Mar1970 ---------------------------------------------------------------------- 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
