Date   : Mon, 29 Sep 2003 17:55:50 +0100
From   : Andrew Hancock <Andrew.Hancock@...>
Subject: Re: EPROMS

I've just tested this and found that I had to program the High Bank (0x4000
0x7fff) on a 27256k for the rom to be "seen" on a BBC.

Regards

Andrew


PS I had no 2764 or 27128 to hand!


-----Original Message-----
From: Mike Tomlinson [mailto:mike@...] 
Sent: 29 September 2003 14:45
To: bbc-micro@...
Subject: Re: [BBC-Micro] Re: EPROMS

In article <030929115518@...>, Jonathan Graham Harston
<jgh@...> writes
>> Message-ID: <000001c36b2d$3b6f0de0$6600a8c0@...>
> 
>"C Alastair Seggie" <alastairseggie@...> wrote:
>> If you put 16k it to a 27512. Would this work in a BBC? I am aware that
>> they can only access 16k, but would it just access the first 16k of the
>> 27512 in the same way as a 27128?
> 
>Yes you can. To avoid any problems if A14 floats unexpectedly, I'd blow
>the same 16K image to both the bottom and the top of the EPROM.

That'd be a 27256 (32k), though, wouldn't it?  A 27512 would be 64k
(i.e. 4 off 16k banks) and another address pin to deal with.

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