Date   : Fri, 28 Jan 2005 23:24:40 +0000
From   : jgh@... (Jonathan Graham Harston)
Subject: Re: Newbie with a Master

"Richard Hobbis" <Richard.Hobbis@...> wrote:
> I purchased a Master on the New Zealand auction site TradeMe.co.nz. I pur
> chased it because Bs just don't turn up on TradeMe and a Master is near-
> as-dammit the same. Or so I thought. It turns out that I got a Master Eco
> net terminal of some sort - I didn't know they existed! There are NO expa
> nsion or peripheral ports on it, so there's no chance of connecting a pri
> nter or external floppy drive - but there is an Econet port.
 
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, or get hold of a 8*16K
combined MOS ROM to replace the 4*16K combined MOS in the Master
ET. Adding a printer port is a similar process. Many people did
this with BBC Model As to partially convert them into Model Bs.
Save up a bit. Add another 16K of memory. Save up a bit more. Add
a printer port. Save up a bit more... etc.
 
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.
 
-- 
J.G.Harston - jgh@...                - mdfs.net/User/JGH
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