They use the same R and S numbers, just late revision suffices. I have a machine made with them that sometimes even works. I have a bunch that have had the gold fingers peeled off (don't blame me - I got them this way).
-- Will On Fri, Dec 21, 2018 at 6:26 PM Al Kossow <a...@bitsavers.org> wrote: > > yea, that was it > > http://www.computerhistory.org/collections/catalog/XD37.80 > > I didn't know we had this example in the collection, they were > hybrids like IBM SLDs > > Do you know of any module part numbers that used them? > > > On 12/21/18 2:40 PM, William Donzelli wrote: > >> The original "Flip Chip" was a packaging failure. It was literally a die > >> bonded to a PCB > >> and never went into production. > >> > >> I think it is mentioned in "Computer Engineering" > >> > >> IBM perfected the techniques to do this later with the development of > >> solder bumps and > >> IR reflow. > > > > Are you talking about the little black rectangles, sort of SIP > > packages, DEC tried in the late 1960s? They were a disaster with > > reliability, but they did ship. > > > > -- > > Will > > >
