Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.csd.uwm.edu!cs.utexas.edu!sun-barr!oliveb!amiga!cbmvax!grr
From: grr@cbmvax.UUCP (George Robbins)
Newsgroups: comp.sys.amiga.tech
Subject: Re: OVL line in Amiga 2000
Message-ID: <7708@cbmvax.UUCP>
Date: 19 Aug 89 08:15:34 GMT
References: <8908181206.AA07159@jade.berkeley.edu>
Reply-To: grr@cbmvax.UUCP (George Robbins)
Organization: Commodore Technology, West Chester, PA
Lines: 20

In article <8908181206.AA07159@jade.berkeley.edu> U211344@HNYKUN11.BITNET (Olaf 'Rhialto' Seibert) writes:
> I bought a new Amiha 2000 this week, and looking through the schematics
> in the back of the (German) user's manual, I noticed the familiar
> (from my A1000) memory overlay line (OVL). It went from a CIA (as
> is to be expected) to GARY.
> 
> This makes me wonder. The 2000 doesn't need a boot rom, does it? The
> start of the kickstart ROM has the same structure as the boot rom
> in the 1000. (I know; I disassembled it). Does the OVL line maybe
> map a PART of the kickstart rom to location zero? Or is there a
> boot rom anyway?

OVL says "Map some ROM to location 00xxxx, so that the power-up/reset
can find it's way to the normal ROM location.  The A500/A2000 don't
need "boot ROM's", but you do need to get started somehow...

-- 
George Robbins - now working for,	uucp: {uunet|pyramid|rutgers}!cbmvax!grr
but no way officially representing	arpa: cbmvax!grr@uunet.uu.net
Commodore, Engineering Department	fone: 215-431-9255 (only by moonlite)