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From: bhelf@athena.mit.edu (Bill Helfinstine)
Newsgroups: comp.sys.cbm
Subject: Re: C128 + 1764?
Message-ID: <1991Jan22.225902.24326@athena.mit.edu>
Date: 22 Jan 91 22:59:02 GMT
References: <4104@zaphod.UUCP>
Sender: news@athena.mit.edu (News system)
Organization: Massachusetts Institute of Technology
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In article <4104@zaphod.UUCP> bobh@zaphod.UUCP (Bob Harvey) writes:
>The only thing that concerns me is the line on page 3 of the
>1764 User's Guide that says "Remember the 1764 was designed only for the 64
>and can NOT be used with the Commodore 128."

>Is the warning in the User's Guide
>for electrical reasons or is it just that the 1764 won't work in C128 mode?
>(Or is it just a plot to sell more REU's?! |-)

That's answer (c).

The only difference between the 1700, 1750, and 1764 is the amounts of memory
they contain.  The only reason that you couldn't use a 1750 on a C-64 is the
power supply.  The 1764 comes (came?) with a bigger power supply for the 64,
so 128 users would be buying a useless hunk of metal and plastic, since it
wouldn't even match the power plug on a 128, much less be necessary.  As you
have also read, probably, you can upgrade a 1764 to 512K, which is what I did
and I am using it on my 128 with no problems.

Bill Helfinstine
bhelf@athena.mit.edu