DOS360: Forty years 529
here is 145 (although not very good closeup of front panel)
DOS360: Forty years 531
lots of 370-148 were 512k and sometimes even a mbyte (memory technology getting used was cheaper) and...
from the "mainframe photo album"
some 370 machine characteristics
DOS360: Forty years 530
customer) 145s had DAT from day 1 ... but it wasn't enabled until virtual memory was announce (at which time, the 145s got new microcode loads to enable virtual memory...
370 announce & shiip dates
note in the above ... there possibly is some problem with 145 & 145-3 dates. first it claims that 145 was "withdrawn" only a couple months after it started shipping. also the 145-3 date shows it was announced on the same date as the 148.
this has somewhat more consistant dates for 145 (although the site it was taken from no longer seems to have the information available)
it does say virtual memory was announced for 370 8-72 and shipped 8-73. also that the 135-3 & 145-3 were announce on 8-72 also and shipped 8-73. They do appear to have some gotchas ... with some of the boxes and-or software buttociated with virtual memory available prior to 8-73 (that virtual memory supposedly was available) .... "virtual storage" (the name at the time for virtual memory) would be prereq for any software that used virtual storage. Also 158 had virtual memory ... and so couldn't ship before virtual memory was officially available.
this reference has a lot of dates ... but also some inconsistancies with 145 & 148:
some 370 machine characteristics are here:
some ibm dates from 1964-1974 (with a lot of other dates)