Date   : Tue, 08 Feb 2005 20:19:42 +0800
From   : "Tom Drage" <drage@...>
Subject: Re: BBC SWRAM module

Have a fiddle with the power switch, I have had the same prob.
 

draget
     www.draget.net 


-----Original Message-----
From: Majordomo List Manager [mailto:majordomo@...] On Behalf Of
Michael Foot
Sent: Tuesday, February 08, 2005 4:26 PM
To: bbc-micro@...
Subject: Re: [BBC-Micro] Re: BBC SWRAM module

Quoting "J.G.Harston" <jgh@...>:

> I've had a closer look@... on Michael's site.

[snip]

Thank you very much for taking the time to look at this. I really wasn't 
expecting anyone to analyse it so closely and figure out exactly how it
works.

> Mike, can you post more details on what pin is connected to what?

I've put close up images here:

http://homepages.paradise.net.nz/mjfoot/SRAM_3.jpg
http://homepages.paradise.net.nz/mjfoot/SRAM_4.jpg

The IC under the two small ICs is a 6264 and I assume the bottom IC is a
6462 
also. That would make only 16K RAM, would it not?

The small ICs are 74LS02 and 74LS00.

Unfortunately when I fired the machine up, it failed to boot. The PSU is
fine, 
and it issues a continuous beep, so I'll assume there's a bad contact 
somewhere when I get around to looking at it.

Thanks,

Mike.

--
Michael Foot <mjfoot(at)paradise(dot)net(dot)nz> *
http://homepages.paradise.net.nz/mjfoot/
* Replace letters between () with @ and . when replying


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