[rescue] More IBM emulation fun

[Geoffrey S. Mendelson]

On Tue, Feb 10, 2009 at 01:18:00AM -0600, Bill Bradford wrote:
>On Tue, Feb 10, 2009 at 09:14:38AM +0200, Geoffrey S. Mendelson wrote:
>> ok, does anyone else remember the difference between the 360/67 virtual
>> memory and the 370?
>
>Wikipedia actually goes into pretty good detail:
>
>http://en.wikipedia.org/wiki/IBM_System/360-67#Virtual_memory

It's not quite right. The "dat box" (dynamic address translation?) was
availble in the early 370's, long before XA. There was a good reason to
drop that high order bit, anyone know why?

Geoff.
 -- 
Geoffrey S. Mendelson, Jerusalem, Israel gsm at mendelson.com  N3OWJ/4X1GM