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Programming > Assembly 370 > Re: S/360
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Re: S/360

by "Sven Pran" <no.direct@[EMAIL PROTECTED] > Jan 14, 2006 at 01:32 AM

"robin"  wrote
...............
>> Other problems were corrected in a massive Engineering Change, which
>> added a guard digit to double precision, added postnormalization to the
>> halve instructions HER and HDR, and changed the results returned in
>> cases of overflow and underflow.
>
> Are you sure of that?  The 1964 Principles of Operations
> states that a zero word is returned for underflow,
> which it always did.

Has the handling of exponent underflow not always been under control of
the PSW Program mask for exponent underflow like it is today?

Your description is correct for the mask bit set to zero, but if the mask
bit is one the operation is completed with the exponent set to 128
greater than the correct value and a program interrupt is generated.

Regards Sven




 79 Posts in Topic:
Re: S/360
 hancock4@[EMAIL PROTECTED  2006-01-13 09:25:48 
Re: S/360
 "John W. Kennedy&quo  2006-01-13 15:26:11 
Re: S/360
 "robin" <rob  2006-01-13 23:28:44 
Re: S/360
 "John W. Kennedy&quo  2006-01-13 19:30:47 
Re: S/360
 glen herrmannsfeldt <g  2006-01-14 02:00:48 
Re: S/360
 "Donald L. Dobbs&quo  2006-01-14 11:53:14 
Re: S/360
 "robin" <rob  2006-01-15 14:25:08 
Re: S/360
 "John W. Kennedy&quo  2006-01-15 11:46:34 
Re: S/360
 glen herrmannsfeldt <g  2006-01-16 00:26:15 
Re: S/360
 "robin" <rob  2006-01-16 23:28:40 
Re: S/360
 "robin" <rob  2006-01-16 23:28:41 
Re: S/360
 "John W. Kennedy&quo  2006-01-16 20:11:37 
Re: S/360
 glen herrmannsfeldt <g  2006-01-16 19:28:21 
Re: S/360
 "Tom Linden" &l  2006-01-16 20:19:01 
Re: S/360
 glen herrmannsfeldt <g  2006-01-16 21:59:58 
Re: S/360
 multicsfan <multicsfan  2006-01-17 13:01:21 
Re: S/360
 Dan Nagle <dannagle@[E  2006-01-17 13:35:59 
Re: S/360
 multicsfan <multicsfan  2006-01-17 21:09:17 
Re: S/360
 Dan Nagle <dannagle@[E  2006-01-17 22:00:29 
Re: S/360
 multicsfan <multicsfan  2006-01-17 22:11:17 
Re: S/360
 glen herrmannsfeldt <g  2006-01-17 19:11:38 
Re: S/360
 multicsfan <multicsfan  2006-01-18 04:18:15 
Re: S/360
 glen herrmannsfeldt <g  2006-01-17 21:00:10 
Re: S/360
 "robin" <rob  2006-01-18 13:27:46 
Re: S/360
 "robin" <rob  2006-01-17 21:18:17 
Re: S/360
 "John W. Kennedy&quo  2006-01-17 22:16:30 
Re: S/360
 ime@[EMAIL PROTECTED] (R  2006-01-19 06:31:58 
Re: S/360
 "John W. Kennedy&quo  2006-01-19 11:31:46 
Re: S/360
 "Tom Linden" &l  2006-01-19 14:25:29 
Re: S/360
 "John W. Kennedy&quo  2006-01-21 00:11:31 
Re: S/360
 "robin" <rob  2006-01-22 02:11:29 
Re: S/360
 "John W. Kennedy&quo  2006-01-21 23:53:43 
Re: S/360
 ararghmail601NOSPAM@[EMAI  2006-01-21 23:45:18 
Re: S/360
 "Tom Lake" <  2006-01-22 07:27:13 
Re: S/360
 ararghmail601NOSPAM@[EMAI  2006-01-22 02:45:39 
Re: S/360
 "Tom Lake" <  2006-01-22 10:26:38 
Re: S/360
 ararghmail601NOSPAM@[EMAI  2006-01-22 05:33:34 
Re: S/360
 Bob Lidral <l1dralspam  2006-01-22 09:05:28 
Re: S/360
 "John W. Kennedy&quo  2006-01-22 12:39:26 
Re: S/360
 "Tom Lake" <  2006-01-22 18:07:39 
Re: S/360
 Bob Lidral <l1dralspam  2006-01-23 01:47:44 
Re: S/360
 "John W. Kennedy&quo  2006-01-22 12:37:49 
Re: S/360
 "R. Vowels" <  2006-01-24 14:25:07 
Re: S/360
 "robin" <rob  2006-02-02 23:36:41 
Re: S/360
 glen herrmannsfeldt <g  2006-01-19 20:14:04 
Re: S/360
 "robin" <rob  2006-01-20 00:14:17 
Re: S/360
 "robin" <rob  2006-01-20 00:14:16 
Re: S/360
 "John W. Kennedy&quo  2006-01-21 00:22:49 
Re: S/360
 "robin" <rob  2006-01-22 02:11:31 
Re: S/360
 "John W. Kennedy&quo  2006-01-21 23:59:22 
Re: S/360
 "R. Vowels" <  2006-01-24 14:25:08 
Re: S/360
 "robin" <rob  2006-04-08 03:34:11 
Re: S/360
 glen herrmannsfeldt <g  2006-04-07 22:16:04 
Re: S/360
 "robin" <rob  2006-04-10 01:05:09 
Re: S/360
 "Tom Linden" &l  2006-04-10 06:34:38 
Re: S/360
 Binyamin Dissen <posti  2006-04-10 19:51:31 
Re: S/360
 glen herrmannsfeldt <g  2006-04-10 17:48:54 
Re: S/360
 "James J. Weinkam&qu  2006-04-10 23:15:40 
Re: S/360
 "robin" <rob  2006-05-25 12:58:54 
Re: S/360
 glen herrmannsfeldt <g  2006-05-26 17:41:26 
Re: S/360
 "James J. Weinkam&qu  2006-05-27 05:12:32 
Re: S/360
 ime@[EMAIL PROTECTED] (R  2006-05-27 08:45:31 
Re: S/360
 "robin" <rob  2006-05-25 12:58:54 
Re: S/360
 glen herrmannsfeldt <g  2006-05-25 13:49:57 
Re: S/360
 "robin" <rob  2006-05-29 00:37:01 
Re: S/360
 glen herrmannsfeldt <g  2006-05-28 17:41:27 
Re: S/360
 "robin" <rob  2006-05-30 00:03:10 
Re: S/360
 Steve Myers <noone@[EM  2006-05-31 21:16:13 
Re: S/360
 "robin" <rob  2006-06-01 22:06:11 
Re: S/360
 "robin" <rob  2006-06-02 23:27:59 
Re: S/360
 Steve Myers <noone@[EM  2006-06-03 12:19:30 
Re: S/360
 "robin" <rob  2006-06-07 10:58:32 
Re: S/360
 glen herrmannsfeldt <g  2006-06-07 13:59:32 
Re: S/360
 "robin" <rob  2006-06-10 22:47:44 
Re: S/360
 "robin" <rob  2006-06-01 22:06:11 
Re: S/360
 "robin" <rob  2006-02-03 15:05:02 
Re: S/360
 "Sven Pran" <  2006-01-14 01:32:19 
Re: S/360
 "John W. Kennedy&quo  2006-01-13 19:49:54 
Re: S/360
 multicsfan <multicsfan  2006-01-14 00:22:28 

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tan12V112 Thu Jul 24 0:55:08 CDT 2008.