The following message is a courtesy copy of an article that has been posted to bit.listserv.ibm-main,alt.folklore.computers as well.
[EMAIL PROTECTED] (William H. Blair) writes: > In fact, so many 360/50 machines were being returned to IBM > (off rental), being replaced by either a 370/155 or 370/165, > that IBM was able to plan to build all core memory units for > the 370/165 processor from used (although re-built with new > electronics) 360/50 core memory. It took 4 of the usual size > (512 KB) 360/50 machines to get enough core memory (2 MB) for > the smallest 370/165. There was enough to go around. IBM, in > fact, sent the vast majority of their off-rental 360/50 core > memory to the landfill (for tax/depreciation reasons). They > were happy to do so, because 360/40 and 360/50 customers were > snapping up 370/155 boxes like hotcakes. A bunch got a hold > of 370/165s as well, but unfortunately too many folks leased > or bought one outright. (Both of these boxes were later to > be deemed boat anchors when the OS/VS1 and OS/VS2 SVS + MVS > announcement was made, since the "DAT box" upgrades to them > were so horribly expensive.) re: http://www.garlic.com/~lynn/2008h.html#95 Old hardware DAT box retrofit for 370/165 was a bear. vm370 had taken advantage and used a bunch of new features that were part of 370 virtual memory architecture ... especially in support of cms virtual machines ... and it was all running on 370/145s internally. however, 165 engineers were having a hard time implementing the full 370 virtual memory architecture. finally there was an escalation meeting where the 165 engineers proposed dropping a whole bunch of 370 virtual memory hardware features in order to cut six months off their engineering development cycle. Eventually they got their way ... so that 370 virtual memory announce and ship didn't have to slip an additional six months. However, everybody else (both hardware & software) that had already finished implementing the full 370 virtual memory architecture had to go back and pull everything dropped on behalf of the 165 (this included vm370 having to put together a real Q&D cludge for things like supporting shared segments across cms virtual machines). ---------------------------------------------------------------------- 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
