[email protected] (Charles Mills) writes:
> My *recollection* is that the S/360 30 came with up to 48K, or 64K by RPQ. I
> could be off, but 1MB sounds incredibly high to me.

ga24-3231-7, 360-30 functional characteristics pg14 (from bitsavers)

c30    8kbytes
d30   16kbytes
dc30  24kbytes
e30   32kbytes
f30   64kbytes

....

univ had 709/1401 and was sold 360/67 replacement (for tss/360)
... pending delivery of 360/67, transition replaced 1401 with 64kbytes
360/30 ... gave univ.  chance to get acquated with 360 ... but 360/30
could be also be run in 1401 hardware emulation mode.

tss/360 never quite came to production fruition ... so 360/67 ran most
of the time as 360/65 with os/360.

IBM offered 2361 large capacity storage
https://en.wikipedia.org/wiki/IBM_2361_Large_Capacity_Storage

models came in 1mbyte and 2mbyte for models 50, 65, and 75.

i also remember ampex (and other vendors) offering LCS up to 8mbytes,
also additional memory for 30s & 40s.

search engine turns up other vendors offering addon
semiconductor/monolithic memory for 360s in the 70s with larger sizes at
cheaper prices.

-- 
virtualization experience starting Jan1968, online at home since Mar1970

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