Re: is there any easy way to upgrade a C116 to 64k

You can use external expansion like this one:
http://plus4world.powweb.com/hardware/16_To_64 . There are several types of
them in the hardware section of Plus/4 World.
But this means you can't use your expansion port for anything else (except
the 1551 drives which has a pass-through connector).


2013/4/30 Gerrit Heitsch <gerrit@laosinh.s.bawue.de>

> On 04/30/2013 09:44 PM, didier@aida.org wrote:
>
>> is there any easy way to upgrade a C116 to 64k ?
>>
>> I found a few document on the web…
>>
>> To upgrade a C16 to 64k
>>
>> Looks like awful hack L
>>
>> With tracks cuts and A lot of spaghetti to rebuild the tracks
>>
>> I mean upgrading without mutilating the mother board..
>>
>
> There is no other way than to replace the existing RAM with 41464 DRAMs.
> In order to use them properly, you will have to cut 2 traces and make 2 new
> connections.
>
> But you're lucky insofar that it's way easier on the C116 than on the C16.
>
> Short form:
>
> - Replace the 2 RAMs with 41464 (64Kx4) DRAM
> - Cut trace between pin 14 and Pin 16 of U8 (topside)
> - Cut trace between pin 16 and Pin 2 of U7 (underside)
> - Make a new connection between CPU Pin 22 and U7 Pin 2
> - Make a new connection between CPU Pin 21 and U8 Pin 14
>
> Done... Now you should be greeted with 60671 Bytes free.
>
> U7 and U8 are the two 74LS257.
>
>  Gerrit
>
>
>
>
>
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