Date   : Sat, 29 Jan 2005 09:49:44 +0000 (GMT)
From   : Sprow <info@...>
Subject: Re: Newbie with a Master

In article <050128235506@...>,
   Jonathan Graham Harston <jgh@...> wrote:
> > Message-ID: <CC6A81171CBC3A4BA1A59667704B373906C7421C@...
>  
> "Richard Hobbis" <Richard.Hobbis@...> wrote:
> > I purchased a Master on the New Zealand auction site TradeMe.co.nz. 
> > [...] It turns out that I got a Master Econet terminal of some sort
> >  
> It's fairly simple to add the extra hardware to the Master ET. Off
> the top of my head, you should just need:
>  
>   IC1 : 7406 hex inverter
>   IC2 : 7438 quad NAND
>   IC3 : 1770 or 1772 Floppy Disk Controller
>   IC4 : 74LS174
>   PL1 : 34-way IDC header
>  
> and the Master DFS. You could either get DFS 2.xx blown into a 16K
> ROM and plug it into a spare ROM socket.

I think you'd want to replace the 27512 with a normal MOS 3.20 ROM, there's
not much in OS 4.00.

[snip]

> If possible, it would be useful if you could take some pictures of
> the inside of your machine. I've not seen and pictures of the PCB
> populated for a Master ET.

I've got an ET somewhere, the PCB is pretty barren. I would suspect that
getting the link settings right and getting all of the chips would exceed
the effort of finding a normal Master,
Sprow.