× The internal search function is temporarily non-functional. The current search engine is no longer viable and we are researching alternatives.
As a stop gap measure, we are using Google's custom search engine service.
If you know of an easy to use, open source, search engine ... please contact support@midrange.com.


  1.  Home
  2. MI400
  3. April 2010

Re: QPROCT and QPRODT

Some sort of progress on deciphering the CHAR(2) "resulting condition
information" in the Body section you described Simon:

Body section:
CHAR(8) op-code name
CHAR(2) op-code number
CHAR(3) flags
CHAR(1) optional instruction forms
CHAR(2) possibly resulting condition information

Per the Information Centre, branch and indicator keywords are divided into
four groups:
Group 1
HI MXD NOR POS TR ZC
Group 2
CR DEN IGN LO NEG NTZNTC RO
Group 3
AUTH DFR DQ EQ INF SE SGN ZER ZNTC
Group 4
EC NAN NTZC UNEQ UNOR

The first byte appears to indicate which groups are valid for the op-code:
Bit 0: Group 1
Bit 1: Group 2
Bit 3: Group 3
Bit 6: Group 4

The corresponding bits in the second byte appear to denote whether the
condition can be negated. This would explain why the second byte is
b'00000000' for the SIGEXCP op-code as keywords IGN and DFR cannot be
negated.

Best wishes,

Richard




As an Amazon Associate we earn from qualifying purchases.

This thread ...
Follow-Ups:
Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2024 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.