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- Newsgroups: comp.sys.acorn
- Path: sparky!uunet!mnemosyne.cs.du.edu!nyx!styrrell
- From: styrrell@nyx.cs.du.edu (Stuart Tyrrell)
- Subject: Re: Arc's RTC
- Message-ID: <1992Nov6.120550.16448@mnemosyne.cs.du.edu>
- Sender: usenet@mnemosyne.cs.du.edu (netnews admin account)
- Organization: University of Denver, Dept. of Math & Comp. Sci.
- References: <1992Nov5.121703.1830@cs.utwente.nl> <20000@acorn.co.uk>
- Date: Fri, 6 Nov 92 12:05:50 GMT
- Lines: 31
-
- agodwin@acorn.co.uk (Adrian Godwin) writes:
-
-
- >Before you spend any money, try removing the batteries and leaving the machine
- >for several hours (until the voltage on the clock chip really has gone to zero).
- >Then, refit the batteries and do a power-on-delete.
-
- >There's a bit in the clock control register which can stop the clock : removing power
- >from the chip performs a hardware reset on the device and ensures that this bit is in the
- >proper state.
-
- I had a similar problemwith my A3000 after messing around with the IIC
- bus. Unfortunately, you can't take the battery out of the A3000!
-
- The solution was to **breifly** short across the power rails of the
- PCF8583 chip. There are current limiting resitors in the circuit, so as
- long as you're quick, no damage to the battery should occur (you'll only
- get sprayed with shrapnel and nicad anyway!)
-
- I would reccomend doing the same thing to the A400 series, ensuring you
- have removed your duracells first - this will ensure that the PCF8583
- resets completely.
-
- **** WHATEVER YOU DO, DO NOT SHORT ACROSS THE BATTERY ITSELF ON THE
- A3000!! ****
-
- Hope this helps a little,
-
-
- Stuart.
-
-