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From: grr@cbmvax.UUCP (George Robbins)
Newsgroups: comp.sys.amiga
Subject: Re: CBM and upgrade paths
Message-ID: <2724@cbmvax.UUCP>
Date: Wed, 11-Nov-87 09:40:25 EST
Article-I.D.: cbmvax.2724
Posted: Wed Nov 11 09:40:25 1987
Date-Received: Fri, 13-Nov-87 23:47:11 EST
References: <8711040542.AA29099@violet.berkeley.edu> <2696@cbmvax.UUCP> <21704@ucbvax.BERKELEY.EDU>
Reply-To: grr@cbmvax.UUCP (George Robbins)
Organization: Commodore Technology, West Chester, PA
Lines: 35

In article <21704@ucbvax.BERKELEY.EDU> bryce@hoser.berkeley.edu (Bryce Nesbitt) writes:
> In article <2696@cbmvax.UUCP> andy@cbmvax.UUCP (Andy Finkel) writes:
> >
> >Now, here's the interesting part...
> >the address space for the ROM is 512K.  What if we were to take
> >advantage of this, and start putting in 512K of ROM into the
> >A500 and the A2000 ?
> 
> Except that the extra PC trace needed for this was never run to
> the rom socket.  :-(  The decoding is in place, however.

	Please look at the schematics.  You should find an a line labeled A18
	running over to the ROM socket.  Simple calculations will show that
	this is one more address line than is required to address the 256K
	of ROM currently implemented.

> I hope C= goes to a 512K ROM anyway, it's obvious the space could be
> well used.

	Yes, it would be useful, however doing this would be the first
	straw in having system software that would differ between the
	A500/A2000 and the A1000.  Perhaps a better use would be some
	sort of "ROM Disk" that would eliminate much of the need to
	always have a workbench diskette mounted.

> The right hand side of the A500's keyboard needs another support.
> And the A2000's keyboard needs to learn some tricks from the A500 :-).

	Are you sure you didn't discard your FCC shield?  All the A500's
	I've checked out have the right hand side firmly supported.

-- 
George Robbins - now working for,	uucp: {ihnp4|rutgers|allegra}!cbmvax!grr
but no way officially representing	arpa: out to lunch...
Commodore, Engineering Department	fone: 215-431-9255 (only by moonlite)