Re: CBM-II solderless memory expansion

From: Mia Magnusson <mia_at_plea.se>
Date: Fri, 13 Apr 2018 22:01:16 +0200
Message-ID: <20180413220116.00001526@plea.se>
Den Fri, 13 Apr 2018 21:48:53 +0200 skrev Michał Pleban
<lists@michau.name>:
> Hello!
> 
> Mia Magnusson wrote:
> 
> > You might aswell go for 41256 or 44256 then. 
> 
> Then you have to solder additional address multiplexers on the
> motherboard, which is exactly what I want to avoid.

You could place those on a pcb in the PLA socket. 

Either way you'd still need some wires between a PLA replacement and
something that you plug in the RAM sockets, so there is no big
difference here, just different firmware for a GAL/CPLD.

> > P.S. there is another way of doing this, and that involves an
> > additional set of MUXes and some card that both sits in the
> > expansion socket and the coprocessor socket, and mimics what the
> > muxes does on the motherboard. 
> 
> Yes, there is a possibility I am thinking about too.

Maybe it's time for me to actually go ahead and make a B/700
motherboard replica? That way all this could be integrated on the same
PCB. :)


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Received on 2018-04-13 22:05:09

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