That's the first I've heard of a 2084-D48. Interesting catch! The z990 was the first IBM mainframe with the modern quad "book" processor design. The next model, the System z9-109 (renamed to the System z9 EC), introduced the 5th high density processor configuration. You could get a z9 EC with 1, 2, 3, or 4 standard density books, or a 4 book machine with even more processors (high density books). A z990 D48 would seem to be a "missing" high processor density z990 -- although an "E48" designation would have been more consistent if that's what it was -- but I've never heard of such a thing.
That high density innovation was a big breakthrough. A System z9 EC configured as a capacity model 754 (2094-S54) has *double* the PCI rating of a 2084-332 (a z990 D32). In percentage terms that's a huge jump in a single model generation. Anyway, IBM will discontinue maintenance support on something that doesn't exist or at least on something that was never announced. Ken Porowski observes: >Did anyone notice that z890's (2086) were left out of the list? Not at all surprising. The z990 started shipping in 2Q2003. The z890 started shipping a year after that (2Q2004). Also, the z990 has been followed by 4 successor models while for the z890 it's 3. -------------------------------------------------------------------------------------------------------- Timothy Sipples GMU VCT Architect Executive (Based in Singapore) E-Mail: [email protected] ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
