Holy Jehosophat! That's around a quarter of a century ago.
If memory serves (and I'm sure it does) the manual you really need is a Redbook. I was working for Itel/NAS at the time the 3880 came out and it gave us _no_ _end_ of grief because ot its tag timing, which did not conform to the OEMI manual. An evil machine. But the -13's Redbook - whose name and number now escape me - were the first place that IBM discussed ECKD in public. Most especially the Define Extent command. At the time, I became convinced that IBM would extend this architecture to support continuous backup - a sort would set bits to indicate its DASD use was temporary, but a database might set bits to ask the controller to do an incremental backup of the changed tracks. A fair amount of effort went into researching that. I kept the 3880-13 Redbook for many years, and just as many years ago I threw it away. -- Phil Payne http://www.isham-research.co.uk +44 7833 654 800 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
