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Internet Message Format  |  1996-08-05  |  870 b 
  1. Path: dispatch.news.demon.net!demon!mjeff.demon.co.uk
  2. From: mick@mjeff.demon.co.uk (mick)
  3. Newsgroups: comp.sys.amiga.programmer
  4. Subject: Re: Free Cycles
  5. Date: Thu, 15 Feb 1996 22:34:33 GMT
  6. Message-ID: <370.6619T1174T1464@mjeff.demon.co.uk>
  7. References: <xDPTwMD0aRz1@azure.people-x.people.de> <xIIBkMD0aez2@azure.people-x.people.de> <1996Feb15.170809.6386@imada.ou.dk>
  8. NNTP-Posting-Host: mjeff.demon.co.uk
  9. X-NNTP-Posting-Host: mjeff.demon.co.uk
  10. X-Newsreader: THOR 2.22 (Amiga;TCP/IP) *UNREGISTERED*
  11.  
  12. On 15-Feb-96 22:08:09 Bjorn Reese wrote
  13.  
  14. >If my memory haven't betrayed me, clr reads the destination before
  15. >clearing it. So a clr makes two chip accesses. This behaviour is
  16. >also the reason why you should never use clr to clear a write-only
  17. >register.
  18.  
  19. This is correct for the 68000, but for the 68020 and above the clr
  20. instruction does a single Write access.
  21.  
  22.  
  23. Mick.
  24.  
  25.