Date   : Sat, 06 Sep 2003 00:41:39 +0100 
From   : Andrew Hancock <Andrew.Hancock@...>
Subject: Re: BBC Master 512K Upgrade to 1024k

 
Yes, I've the same book.

I purchased the book, when it first came out, and spoke to the author at
length because the circuit was incorrect.

I never complete the project because of cost of the ram at the time, and was
able to run most PC applications I wanted to.

But from memory, you needed to re-write code in the eproms to support this
additional ram. I'm sure I was sent two new eproms to insert into my board,
but where they are now is a mystery!

Andrew

  

-----Original Message-----
From: Mike Mallett [mailto:mike.mallett@...] 
Sent: 05 September 2003 23:51
To: 'Andrew Hancock'; bbc-micro@...
Subject: RE: [BBC-Micro] BBC Master 512K Upgrade to 1024k

I have a vague memory of one of the 512 books I have here having a complete
DIY project for this ....





> -----Original Message-----
> From: Majordomo List Manager [mailto:majordomo@...] On Behalf Of
> Andrew Hancock
> Sent: 05 September 2003 23:18
> To: 'bbc-micro@...'
> Subject: [BBC-Micro] BBC Master 512K Upgrade to 1024k
> 
> 
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Hi
> 
> Shortly after the BBC Master 512k was released, documentation was
available
> to complete DIY upgrades to add another 512k RAM.
> 
> At the time I never complete the upgrade due to lack of funds and cost of
> ram.
> 
> Completing a PCB today for this upgrade shouldn't be a problem, but from
> what I remember new eproms were required to address this memory range.
> 
> There was a company that was producing these upgrades commercially.
> 
> Does anyone have images of the roms on the Daughterboard or completed
PCBs?
> 
> Regards
> 
> Andrew
>