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

From: Gerrit Heitsch <*gerrit_at_laosinh.s.bawue.de*> Date: Tue, 30 Apr 2013 22:14:09 +0200 Message-ID: <51802611.7050105@laosinh.s.bawue.de> · gerrit_at_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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