[comp.sys.amiga] Hardware switch between 68030 and 68000

groo@chsdip (Bill Squier) (07/11/90)

I don't get comp.sys.amiga.hardware, and this is pretty general interest.


Being the pround new owner of a 33MHz GVP 68030/68882 board, I decided
to remove my old 68010 from the motherboard and replace it with the
original 68000 (for compatibility reasons).  According to the GVP
documentation:

[p.15] "...If you anticipate the need to switch between 68030 mode and
        68000 mode frequently you may wish to mount a switch to the
        Amiga's rear panel and connect it to J11..."

I've done just that.

Now, my question:  Is there any problem with throwing that switch while
the machine is on (and perhaps, actually running)?  Obviously, I expect
it to crash the machine, but that's a moot point since I'm aiming to
reboot at that point anyway.  The way I see it, "power" is applied at
all times to both the 68000 and the 68030, it's just a matter of
redirecting the data.  I had a friend who's done this for about a year
with apparently no ill effects.

-----
Bill Squier (groo)	Amiga :  uunet!tronsbox!dsoft!chsdip!groo (best)
`Only Amiga!'	        VAX   :  uunet!vaxb.stevens-tech.edu!u93_wsquier

dfrancis@tronsbox.xei.com (Dennis Francis Heffernan) (07/11/90)

	RE: 68000/030 switch on GVP boards

	I used to have such a switch attached, but it was a real UnGood wire-
wrap job and it made me nervous, so I took it off.
	Throwing it with the power on didn't do anything.  I notice, though,
that the machine was more likely than not to guru on reboot if you did.


Dennis Francis Heffernan	|  "Remember the words of your teacher,
dfrancis@tronsbox		|   your master: Evil moves fast, but
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Original text (c) 1990  	|   --Partners in Kryme, T-U-R-T-L-E Power!