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)