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From: dsmall@well.sf.ca.us (David Small)
Newsgroups: comp.sys.atari.st
Subject: Re: how about an upgrade to 68010
Message-ID: <22662@well.sf.ca.us>
Date: 16 Jan 91 06:08:59 GMT
References: <A1444681262@thelake.mn.org>
Organization: Whole Earth 'Lectronic Link, Sausalito, CA
Lines: 22


I've plugged a 68010 into an ST and gotten it working (with the help of a Zax
in-circuit emulator).

	TOS 1.0, 1.2, and 1.4 do not recognize the larger stack frame 
associated with the 68010,20,30,and 40. They also adopt space-saving
techniques
that make them 680x0 incompatible, such as stacking up an SR and a PC,
then doing an RTE-- which will probably bomb on a 68010.

	To bring up the 68010, we used a jumperboard with TOS 1.6 ROMS in it,
mapped at ^?$e0 0000 for 256K worth. The 68010 then worked nicely. (We did
have
to remove some ST-E specific stuff from the ROMs; it was trying to initialize
hardware we did not have in that ST!)

	From there, we went to the 68030.

	It's quite a project to get the 68010 up on the ST, and that chip
is pretty much obsolete anyway. The 030 is where the action is at.

	-- thanks, Dave / Gadgets