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Path: utzoo!utgpu!water!watmath!thfisher
From: thfisher@watmath.UUCP
Newsgroups: comp.sys.cbm
Subject: Re: trouble with 128 running in 64 mode
Message-ID: <14857@watmath.waterloo.edu>
Date: Thu, 24-Sep-87 09:27:26 EDT
Article-I.D.: watmath.14857
Posted: Thu Sep 24 09:27:26 1987
Date-Received: Sat, 26-Sep-87 10:04:42 EDT
References: <3495@rutgers.rutgers.edu> <1662@ulowell.cs.ulowell.edu> <2315@cbmvax.UUCP> <3694@pogo.TEK.COM> <267@uwslh.UUCP>
Reply-To: thfisher@watmath.waterloo.edu (terry fisher)
Distribution: na
Organization: U. of Waterloo, Ontario
Lines: 31

In article <267@uwslh.UUCP> lishka@uwslh.UUCP (Christopher Lishka) writes:
>
>I am not sure why the cartridge won't work with the 128, but I have noticed
>one other funny problem.  If one sticks a Fastload cartridge in the back of
>a 128, the machine automatically comes into 64 mode (without any help).  To
>get the bugger to power up as a 128, you must have the cartridge removed.
>Strange...but logical.  Anyone know why this is so?  Does the Fastload
>cartridge have some sort of circuitry in it to make sure that this happens,
>or is this the default option for cartridges in the back of a 128?
>
>						-Chris
>-- 
>Chris Lishka                    /lishka@uwslh.uucp
>Wisconsin State Lab of Hygiene <-lishka%uwslh.uucp@rsch.wisc.edu
>                                \{seismo, harvard,topaz,...}!uwvax!uwslh!lishka

All auto-start cartridges for the C64 contain 5 bytes of Auto-start code 
starting at location $8004 (at least as I can remember). These 5 bytes are
checked by the computer at power-on.  When you plug a C64 cartridge into
a C128, the 128 recognizes these bytes as being the 64 startup.  The 128
mode auto-start uses a slightly different sequence of characters to indicate
that they are 128 mode cartridges. (for those of you who are curious, I believe
that the 64 startup code contains the string 'CBM80'.  Its been a while since
I've used it so I could be wrong, and I'm not sure what the 128 uses.)

Terry Fisher
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thfisher@watmath                       Vic20,C64,C128,Amiga: What next?