Date   : Thu, 29 Sep 2005 22:31:54 +0100
From   : "Ian Wolstenholme" <BBCMailingList@...>
Subject: Re: Care Electronics ROM Cartridge

Looking at the picture "Rom1", the notches on the chips should be
facing down.

I am always putting EPROMs in the wrong way up, you get the white
flash but it doesn't seem to do them any harm.  Did it yesterday with
the ROMBox without any trouble.

Best wishes,


Ian
----- Original Message -----
From: A. J. Davis
To:   bbcmicro@...
Sent: Thu, 29 Sep 2005 19:37:49 +0100
Subject: Re: [BBC-Micro] Care Electronics ROM Cartridge

I've made a few pictures:

http://www.alchemistresearch.com/bbc/rom/rom1.jpg
http://www.alchemistresearch.com/bbc/rom/rom2.jpg
http://www.alchemistresearch.com/bbc/rom/rom3.jpg

The damaged chips had their notches 'West'. I'm not so bothered about 
the chips because I have a programmer and a good supply of chips.

Andy.

Nick B. wrote:

> Maybe the cartridge is assembled incorrectly? If the PCB is not in the 
> case then there is the possibility it can be plugged in either way!
>
> Just looking at mine that takes 4 EPROMS, fitted with two slide 
> switches on top. When inserted in MAster the ICS face away from the 
> keyboard and the pips on the (2764 or 27128) EPROMS should be facing 
> downwards.
>
> If the EPROMS were seen to be glowing then there is a good chance they 
> have been fried. If the glass window is not covered then they will 
> erase themselves over time as they are sensitive to UV.
>
> Regards,