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From: TLC (all posts)
Date: 1998-07-17
Subject: Re: Csory

Hi again...

> Also on comp.emulators.cbm someone wrote that the C64 mem expansion modul
> (REU) can be hacked up to support up to 16MB. Did someone on the
> plus4 something similar???

As you know there were no units like the REU for the Plus/4. Those expansions I've seen were hacks, the first may have done by Hannes, and later Solder,
then I know there have been one designed by Csory which handled the 256K a lot better (being still compatible with the former). All these go with replacing the 4164 rams to 41256 chips on the motherboard, plus building a 'small' board for the paging.

Actually, I do have a doc with schematic of an 1Mb expansion for the Plus/4. It was done by Hendrik Lipka, and it's a successor of the above.
Its only disadvantage is the plain manufacturing tech, you have to solder
8x4 14 pin chips one on one, and then use the well known '3d-net technology'
around the chips to wire everything to the right place. (I guess it could be better designed, but I felt nothing to do the PCB work :-( ). Still,
you can have it. However, I can't help much in its programming (maybe,
the original doc does, or at least I have a disk with 256K exp stuffs from Solder (with the CBM plotfiles I mentioned above) which has also programming specifications for the exp).

Levente