Since I have no access to the console or the system at all, I was thinking
more of tests like "measure voltage at pin x of the chip". If I can not find
a way to get to the prom prompt, I might have to replace the chip and hope.

Best regards,
Reiner.

> -----Original Message-----
> From: Maciej W. Rozycki [mailto:macro@ds2.pg.gda.pl] 
> Sent: Thursday, November 20, 2003 7:55 PM
> To: Reiner Buehl
> Cc: port-pmax@netbsd.org
> Subject: Re: Maxine graphic card hardware problem
> 
> 
> On Thu, 20 Nov 2003, Reiner Buehl wrote:
> 
> > Is there a way to "test" the battery in this dallas chip to ensure 
> > that this is the cause before replacing the chip?
> 
>  Unfortunately there does not seem to be a specific test in 
> the console -- perhaps it reports an error is the chip 
> signals a battery failure, but I don't know.  However, you 
> may query the chip directly -- the battery state is reflected 
> in bit 7 of register D of the chip.  For the Maxine you can 
> get to the register by typing:
> 
> >> e -bx 0xbc200034
> 
> at the console.  If the reported value is "0x80", then the 
> battery is OK; if it's "0x00", then the battery failed.
> 
>  The 3min uses the same address, but for other DECstation 
> models it has to be changed appropriately.
> 
> -- 
> +  Maciej W. Rozycki, Technical University of Gdansk, Poland   +
> +--------------------------------------------------------------+
> +        e-mail: macro@ds2.pg.gda.pl, PGP key available        +
>