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). the 145s did have front panel with lots of lights and "rollers" with crypted designation about the meanings of the lights. all 145s shipped to customers had the physical rollers ... and included a "xlat" designation for one of the lights. this resulted in some speculation in the press prior to 370 virtual memory announcement.

165s had to have (fairly large) hardware retrofit in the field.

138, 148, 158, and 168s were all new technology and models to the previous 135, 145, 155, and 165.

virgil-tully (138-148) besides being faster & typically more memory than their predecessor ... had operating system microcode performance buttists (vs1 and vm) ... and the 148 had significantly faster floating point than the 145 (much faster than the nominal overall speedup of the 148 over the 145).

besides ecps project mentioned in previous postings

the science center:

had an earlier joint project with endicott. this was to create software virtual machine (cp67 running 360-67) that emulated the 370 architecture (including virtual memory), as oppsed to emulating 360-67 architecture. 370 architecture had some number of new instructions not found in 360 ... and the virtual memory tables had a number of differences from those defined in 360-67. this was running in regular use at least a year before the first engineering 370-145 with virtual memory was operational.

various past postings on cp67h & cp67i activities:

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