Path: utzoo!attcan!uunet!husc6!mailrus!csd4.milw.wisc.edu!jgreco
From: jgreco@csd4.milw.wisc.edu (Joe Greco)
Newsgroups: comp.sys.cbm
Subject: Re: 1764 and C-128
Keywords: 1764 in the C-128? Myth or Reality?
Message-ID: <513@csd4.milw.wisc.edu>
Date: 22 Jan 89 19:31:57 GMT
References: <2413@nunki.usc.edu>
Sender: news@csd4.milw.wisc.edu
Reply-To: jgreco@csd4.milw.wisc.edu (Joe Greco)
Organization: UW-Milwaukee Home for Out-of-date 8 bit Hackers
Lines: 34

In article <2413@nunki.usc.edu> aliu@nunki.usc.edu (Alejandro Liu) writes:
>I heard a while back that it is possible to use the 1764 in the C-128,
>since the 1764 was identical to the 1750 REU except for ONE resistor.
>Is this true?  Can anybody confirm or deny this?

The 1764 is only a 256K expander.  The 1764 comes bundled with a heavy
power supply, which is really the major difference.

The 1750 is a 512K expander.  The "resistor" you mention, if I recall
correctly, only involves certain versions of the 128 expanders and
early versions of the c64.  Perhaps Fred B or some Commodore guru
could clear this up, I haven't had any problems running a 1750 on ANY
of my machines (even a vintage 1982 model).

I've heard of people using the 1764 on the 128, but with somewhat
limited success since a fair amount of software is expecting a 1750
(very little seems to expect a 1700).  I don't have a 128, so this is
just stuff I've heard through the grapevine.

I've also heard conflicting stories about the configuration of the
1764's RAM.  I know that the 1700 is two banks of 64K, and the 1750 is
two banks of 256K.  I heard originally that the 1764 was two banks of
128K (!!) (rather odd) but have heard since that it is just one bank
of 256K.  I know that there could be two versions of the expander out
there, has anyone seen either of these two configurations?

.									JG


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