Path: utzoo!utgpu!water!watmath!clyde!rutgers!sri-spam!ames!umd5!purdue!gatech!mcnc!decvax!decwrl!nac.dec.com!plouff
From: plouff@nac.dec.com (08-Jan-1988 0946)
Newsgroups: comp.sys.amiga
Subject: Still More 68020 Questions
Message-ID: <8801081459.AA16543@decwrl.dec.com>
Date: 8 Jan 88 17:46:00 GMT
Organization: Digital Equipment Corporation
Lines: 23

[]

For Commodore folks:  This month's _AmigaWorld_ has an article 
about the CSA 68020 board for the A2000.  The performance numbers seem 
disappointingly low, and some of the explanations a bit screwy.  Can 
someone answer two simple questions?  The answers to these are not 
obvious in my rather meager document set or from rereading the slush 
pile of saved comp.sys.amiga articles.

1.  When the operating system recognizes a 68020, what exactly does it 
do?  Is the '020 instruction cache turned on by ROM Kernel routines (or 
elsewhere in the OS), or must the user run a separate program?

2.  Other than running self-modifying code, can one get in trouble 
running with the cache enabled?

Thanks in advance,

Wes Plouff
Digital Equipment Corp.		UUCP:	   ...!decwrl!nac!plouff
Littleton, Mass.		Internet:  plouff%nac.dec@decwrl.dec.com

"Which TV show do YOU watch with the shock of recognition?"