>         1 read from card readers

ISTR 'I' was read a card.  Operand A (if present) was the branch
location - boot decks were a succession of 'I056' commands - the boot
deck itself was executed to move its own contents into storage and set
word marks.

On a more relevant topic, the formal Announcement Letter for the
zSeries Linux offering is available:

http://isource.ibm.com/cgi-bin/goto?it=usa_annred&on=102-030

--
  Phil Payne
  The Devil's IT Dictionary - last updated 2002/01/20:
http://www.isham-research.com/dd.html
  UK +44 7785 302803
  Germany +49 173 6242039

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