Anne & Lynn Wheeler <[EMAIL PROTECTED]> wrote: > part of the reason that i don't really know the definitive answer to > your question is that BB in BBCCHH may have been planned for a number > of related products ... besides the 2321. i have some vague > recollection of discussions related to 1360/pdss which may have also > motivated the inclusion of BB in 360 ckd dasd architecture; i.e. even > if 2321 hadn't shipped ... the decision to include BB may have been > made assuming a variety of products that might use it.
I always thought it was to fill up an eight byte address. This reminds me that the addresses on floppy disks have three bytes, cylinder, head, and sector. That is, a whole byte reserved for head when there can only be two. Reserving two bytes for HH in MBBCCHHR addresses is also planning ahead. -- glen ---------------------------------------------------------------------- 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
