Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!cbmvax!daveh
From: daveh@cbmvax.commodore.com (Dave Haynie)
Newsgroups: comp.sys.amiga.tech
Subject: Re: What is setcpu?
Message-ID: <15818@cbmvax.commodore.com>
Date: 12 Nov 90 23:42:34 GMT
References: <11121@ccncsu.ColoState.EDU>
Reply-To: daveh@cbmvax.commodore.com (Dave Haynie)
Distribution: usa
Organization: Commodore, West Chester, PA
Lines: 31

In article <11121@ccncsu.ColoState.EDU> whicker@handel.cs.colostate.edu (gary alan whicker) writes:

> I have noticed several references to a program called "setcpu" being
> used in conjunction with accelerator cards. I have an A2500/30 but 
> do not have such a program. Could some kind soul please tell me what
> this program does, and where I can get it if it's important to have?

SetCPU is a program I originally wrote to muck around with 68020 and, later,
68030 cache parameter.  It's gradually grown to provide very simple MMU
functions.  This was first the ability to put a copy of the ROM Kernel into
a chunk of 32 bit RAM (what I call a FASTROM translation), thereby speeding
up basic OS operations by a factor of four or so.  That mutated one weekend
into the capability to read in new KickStart images from either file or
KickStart disk.  The current version, SetCPU V1.6 on Fish Disk 400 (including
source), will handle both 256K and 512K KickStart images, it'll set up its MMU
tables with appropriate cache management for Chip RAM, I/O, and Bridge Card,
and it'll translate the system Stack into 32 bit memory if it happens to find
this in Chip memory.  A few more functions in there too, but in general, most
folks with 68030 systems find it useful, since it buys you extra speed if
nothing else.

There are system utilities in AmigaOS Release 2.0 which provide some of the
same features as SetCPU, and SetCPU as of V1.6 does "the right thing" in 2.0
to be compatible with the 2.0 way of doing things.

>o"All dross of education and | Gary Whicker                        o

-- 
Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests"
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	Standing on the shoulders of giants leaves me cold	-REM