Re: Hacking 1764 RAM expansion to 512KB

From: Marko Mäkelä (marko.makela_at_hut.fi)
Date: 2002-03-26 20:07:07

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    Daniele Gratteri wrote:
> Thanks! I have searched on FUNET in many directories, but never thought of
> the DOCUMENTS one :-(

Or the ALLFILES or ALLDIRS documents?  (Beware, the HTML versions of 
these documents, especially the main document 
http://www.funet.fi/pub/cbm/ALLFILES.html, can crash your browser, as 
it's rather big.)

> Since you had already done the job, can you tell me if the 390 ohm resistor
> to be placed in the R4 location is really necessary for proper operation of
> the upgraded REU with the C64 and the C128?

I don't think I did anything else than replace the memory chips.  The 
"REU size" jumper (if that's what you mean; I made the updates several 
years ago) is merely connected to an input pin of the REC (RAM Expansion 
Controller) chip, and as far as I know, programs should not rely on the 
corresponding bit in one of the REC registers to determine the size of 
the REU memory.

	Marko



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