Date : Sat, 28 Mar 2009 17:09:39 -0000
From : bbcmailinglist@... (Ian Wolstenholme)
Subject: Technomatic Disaster
This thread is going back a bit, but I've just connected up the Technomatic
Winchester today and it's come back to life!
It was a complete fluke that I tried it, I've been playing about with the
Master Compact lately before it goes into storage. It's got one of those
expansion boards on it with a user port, joystick and 2MHz bus adapter.
I'd been trying to find a device which would work with the 2MHz bus.
A Teletext adapter didn't work so I thought I would have a go with a
hard disc and the abandoned Technomatic just happened to be the nearest
one. It didn't work with the Compact which just went straight to accessing
the floppy, but I wasn't surprised as this had been happening with the
Technomatic after it broke down, and the Compact doesn't have Hard and
Floppy configuration options anyway.
I noticed when pressing BREAK that the Adaptec board LED was blinking,
like it should do, which suggested that the host adapter board might have
come back to life, so I connected it to a Master 128 and it's all working
a treat!
My original message puts the date of the disaster as 28th December 2007,
so it obviously just needed a good 15-month sleep!
Best wishes,
Ian
----- Original Message -----
From: Chris Thornley [mailto:C.J.Thornley@...]
To:
Cc: bbc-micro@...
Sent: Sun, 6 Jan 2008 23:07:41 -0000
Subject: Re: [BBC-Micro] Technomatic Disaster
Hi,
On inspection of there board are there any raised / domed or leaky
electrolytic capacitors?
Chris
/> Christopher J. Thornley is cjt@...
( //------------------------------------------------------,
(*)OXOXOXOXO(*>=*=O=S=U=0=3=6=*=--------- >
( \\------------------------------------------------------'
\> Home Page :-http://www.coolrose.fsnet.co.uk
-----Original Message-----
From: bbc-micro-bounces+c.j.thornley=coolrose.fsnet.co.uk@...
[mailto:bbc-micro-bounces+c.j.thornley=coolrose.fsnet.co.uk@...
uk] On Behalf Of Andrew Benham
Sent: 06 January 2008 14:07
To: Ian Wolstenholme
Cc: bbc-micro@...
Subject: Re: [BBC-Micro] Technomatic Disaster
Ian Wolstenholme wrote:
> I've established that it's the host adapter which is faulty. The
> Technomatic drive and Adaptec board work fine when connected up to
> another host adapter.
Hmm, there's nothing on the host adaptor to go wrong...
> Is there any way I can test the host adapter further? All the ICs are
> registering 5V, some of the resistors are and some of them aren't,
> that might be something to do with it. There's no obvious damage to
> the board and nothing happened that I know of to cause it to fail
suddenly.
I'd check for dry joints as a first pass.
I've come across plastic-packages 74 series TTL suffering from internal rot
if not used for many years (I guess the plastic package isn't perfectly
sealed), but I understand this board failed whilst it was in use. So we can
discount that.
If the board doesn't have any dry joints (and these can take years to
announce themselves), I'd put a scope on the address decode logic on the
host adaptor and run a tight machine-code loop first reading and then
writing from the 4 addresses (FC40 - FC43) in turn - WITHOUT the Adaptec
board connected (just in case).
If all the address decode logic is OK, it's more or less down to the various
buffers.
--
Andrew Benham adsb@...
Southgate, London N14, United Kingdom
The gates in my computer are AND OR and NOT, not "Bill"
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