Date   : Mon, 09 Oct 2006 13:40:33
From   : "Ian Wolstenholme" <BBCMailingList@...>
Subject: Re: Econet clock power requirements

I was guessing a bit with the American clock, I didn't have a UK
Level 1 Clock at the time.  It's the same design as the L1 clock and
I imagine the power requirements would be the same, ie. 8V DC, viz:

http://www.beebmaster.co.uk/Econet/ClockT1.html

Best wishes,



Ian

----- Original Message -----
From: Wright, Chris
To:  <bbc-micro@...>
Sent:  Mon, 9 Oct 2006 11:56:10 +0100
Subject: [BBC-Micro] Econet clock power requirements


I have an 'american' Econet clock (metal shell) which seems to be
working fine, even though it was supplied without psu, meaning I had to
guess the input voltage.
Following the lead of the BeebMaster, I used 9v as per an identical
situation that he found himself in, and has documented on his site.
I am a bit concerned that if this is not the correct voltage I may be
drastically shortening the life of the clock ? In the absence of any
correct power requirement info, should I drop the voltage down to the
lowest voltage at which everything still seems to be working normally ?

Chris.

-----Original Message-----
From: Majordomo List Manager [mailto:majordomo@...] On Behalf
Of Michael Foot
Sent: 09 October 2006 10:37
To: bbc-micro@...
Subject: Re: [BBC-Micro] One more BBC B to fix

In message <4e6fa4f7f2info@...>
          Sprow <info@...> wrote:

> In article <672022E79B6349DBA63CA47178833796@...>,
>    Andrew Chesterton <andrew.chesterton@...> wrote:
>
> > in the process of loading the OS and is now accessing the wrong
> > locations in the memory map.
>
> The OS isn't loaded per se, it's just there. I agree with the general
> suggestion that the address decode is a likely suspect, the OS needs
RAM to
> work everytime it uses a JSR/RTS pair,

I'm still wotking on this problem. So far I've replaced a few ICs with
IC30 (a 74LS74) being one of them. This has helped a bit. Now in 16K
mode I can usually get the machine to boot (bur-beep) but then it locks
up instantly. The screen has the BBC 16K header but the screen then
fills up with BASIC keywords and other junk. Usually it shows STR$ on
alternate lines down the screen. When I press Control-Break I get random
charcters on the mode 7 screen. It still does not boot in 32K mode or
with the jumper off.

I think the general concensus is correct so far. It's either an
addressing issue or a timing one.

I'll keep at it. I becomming a wizz at removing ICs whole without
damaging the board!

Cheers,

Mike.


--
Michael Foot <mjfoot(at)paradise(dot)net(dot)nz> *
http://homepages.paradise.net.nz/mjfoot/
* Replace letters between () with @ and . when replying