Date   : Sat, 21 May 2005 21:44:33 +1200
From   : Michael Foot <mjfoot@...>
Subject: Re: RAM chips for Model B

In message <4d6d8198beinfo@...>
          Sprow <info@...> wrote:

> In article <1116474621.428c0cfdcc78d@...>,
>    Michael Foot <mjfoot@...> wrote:
> 
> [snip]
> 
> > 1) Faulty RAM.
> > 2) Faulty track(s) joining the RAM chips.
> > 3) Faulty 74LS51
> > 4) Faulty 74LS139

I found the problem today. It was indeed a fault RAM chip - IC56 to be ex
act. What I did was set jumper S25 to South and removed one of the socket
ed RAM chips. I then piggybacked this chip over the top of each soldered
RAM chip and sure enough the machine booted when I put it on IC56. So I'm
 glad to have found the problem but now I need to find a replacement chip
.

Cheers,

Mike.

-- 
Michael Foot <mjfoot(at)paradise(dot)net(dot)nz> *
http://homepages.paradise.net.nz/mjfoot/
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