Path: utzoo!utgpu!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!rutgers!cbmvax!ditto
From: ditto@cbmvax.UUCP (Michael "Ford" Ditto)
Newsgroups: comp.sys.amiga.tech
Subject: Re: 32-bit LUCAS memory board
Summary: 32-bit kickstart:  Two roms?
Keywords: kickstart hardware hack
Message-ID: <5322@cbmvax.UUCP>
Date: 27 Nov 88 01:00:49 GMT
References: <1988Nov23.104910.15213@gpu.utcs.toronto.edu>
Reply-To: ditto@cbmvax.UUCP (Michael "Ford" Ditto)
Organization: Commodore Technology, West Chester, PA
Lines: 38

In article <1988Nov23.104910.15213@gpu.utcs.toronto.edu> anakin@gpu.utcs.UUCP (Anakin Research) writes:
>	I would like to move the kickstart area into this 32-bit wide path.
>I must admit that I haven't given this enough thought and any ideas on how 
>this would be accomplished would be appreciated. I can prevent assertion of
>*AS (Address Strobe) in the kickstart range and simply have ROMS on the LUCAS 
>memory board. This seems to me constitute a copywrite infringement. Anyone 
>understands the legalese of this and who could hopefully suggest an honest 
>workaround, please advise me.

How about this:  The user buys *two* copies of the ROM from Commodore; you
have one hooked to the "high" side of the 32-bit data bus, the other to the
"low" side, with one chip's A1 tied high, the other low.  Half of each chip
would be unused, but it sure sounds legal!  (This is not to imply that anyone
should take my legal opinion seriously!)  Perhaps someone who's looked at
the '020 bus spec more recently than I could confirm that it would work...

>        I understand that many of you would like to have an MMU. I don't have
>the neccessary software smarts to make this compatable with the proposed
>unix environment for the amiga and I think other problems may be there as 
>well.

From what I remember about the '851, it's probably "too late" (i.e. you
would have wanted to design that in when you did the memory & 68000 bus
interfaces).  It basically has to go "between" the '020 and the memory.
But on the other hand, it could eliminate the above question about 32-bit
kickstart, since you can do that with MMU tricks.

As for Unix compatibility, nobody else knows how to make that work either,
since we haven't documented what is needed (basically some software setup
that's done in the ROMs on the 2620).  We also haven't announced whether
or not we are going to document it, but I hope we will.
-- 
					-=] Ford [=-

"The number of Unix installations	(In Real Life:  Mike Ditto)
has grown to 10, with more expected."	ford@kenobi.cts.com
- The Unix Programmer's Manual,		...!sdcsvax!crash!elgar!ford
  2nd Edition, June, 1972.		ditto@cbmvax.commodore.com