------------------------------------------<snip>-----------------------
The 2305 was available with selector channel interfaces
before the blk-mux interfaces. At NCSS we were told that it took a
complete selector subchannel, with eight "exposures", to function
properly so we configured them (16 devices) to run off 2860 Selector
channels hanging off a 370/168 system.
The 2880 was first announced for the S/360; the S/370 was not announced
until 1970, a year after the 360/85, and the original announcement did not
include the 370/168. I'd guess that your management simply did not want to
spend the money on a 2880.
-------------------------------------<unsnip>--------------------------------
I can't speak for mgmt decisions. Until the S/370-168 was installed, we
ran almost completely S/360-67's, either simplex, duplex, or one
triplex. This was all in the 1973-1974 time frame. We used the 2305
devices exclusively for paging and we did some "strange things" with
track formats. Like "gap" records that allowed us to switch exposures
quickly. We could read the successive three page records from a single
track, from three different exposures, within a single revolution! Same
thing with page writes. We also LRU'd page records from 2305 to 3330 to
2314, all in the background. Needless to say, we had a fairly complex
paging environment but it seemed to work very well.
I'd KILL for a copy of two programs I used while I was there: IMAGE and
LOGCAP.
Rick
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