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From: daveh@cbmvax.UUCP (Dave Haynie)
Newsgroups: comp.sys.cbm
Subject: Re: trouble with 128 running in 64 mode
Message-ID: <2408@cbmvax.UUCP>
Date: Mon, 28-Sep-87 17:34:04 EDT
Article-I.D.: cbmvax.2408
Posted: Mon Sep 28 17:34:04 1987
Date-Received: Tue, 29-Sep-87 07:23:51 EDT
References: <2384@cbmvax.UUCP>
Organization: Commodore Technology, West Chester, PA
Lines: 22

in article <2384@cbmvax.UUCP>, fred@cbmvax.UUCP (Fred Bowen) says:
> 
> Now, regarding things like fast-load cartridges, they cause the 128 to
> automagically go into 64 mode because they are 64-type cartridges.  This is a
> good thing- they would not run in 128 mode most likely anyhow.  At powerup,
> the 128 (well, Z80 specifically) sniffs the cartridge port and, upon smelling
> a c64 type cartridge ('cause they diddle with /game and /exrom lines), goes
> directly to 64 mode.  More compatability.  Taa-daa.

As a side note for all you C128 fans out there...  The fact that the C= key
bops you into C64 mode started out as nothing more than a fix for some C64
type cartridges that didn't identify themselves as C64 cartridges right 
away.  A few of these suckers diddle /game and /exrom on and off; if they
happened to diddle off at the wrong time, the cartridge might not be seen and
C128 mode would ensue.  In some cases this would crash the C128.  So the C=
is checked right away to force the C128 into giving these cartridges what they
want -- a C64.  Some of the "ghost" or "phantom" cartridges that appear and
disappear in the C64s memory map are in this class.
-- 
Dave Haynie     Commodore-Amiga    Usenet: {ihnp4|caip|rutgers}!cbmvax!daveh
"The A2000 Guy"                    PLINK : D-DAVE H             BIX   : hazy
     "God, I wish I was sailing again"	-Jimmy Buffett