Date   : Tue, 24 Jan 2012 09:03:07 -0000
From   : jim@... (Jim Hearne)
Subject: Help figuring out ICs and ROMs for BBC (B or Master)

To me the bolts look like they are holding together 3 small microswitchs.
So, are the switches used on the EPROM higher address lines to select one of 
maybe 8 different rom images ?

Jim


From: "Rob" <robert@...>
Sent: Tuesday, January 24, 2012 8:14 AM
To: "J.G.Harston" <jgh@...>
Cc: <bbc-micro@...>
Subject: Re: [BBC-Micro] Help figuring out ICs and ROMs for BBC (B or 
Master)

> On 24 January 2012 01:39, J.G.Harston <jgh@...> wrote:
>> stuart wrote:
>>> check the first few dozen bytes of each one. IIRC there is a sign-on
>>
>> Specifically, byte 9 onwards is the ROM's title:
>
> .. assuming they are actually in BBC Micro ROM format - one or two of
> those look like they might have been ripped from other devices,
> especially as some of the chips mentioned might not be Beeb items.
> (Certainly, back in the day, I was not adverse to re-purposing old
> EPROMs, and so had several still with their old contents in them.)
>
> Anybody any idea what the EPROM with the bolts on top might be for?
>
> Rob
>
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