[volt-nuts] 7061 On Board Clock and Battery
DaveH
info at blackmountainforge.com
Tue Jun 26 03:06:32 UTC 2012
Major caveats:
#1) - Can't get the flickr image to show (marginal internet -- rainfade)
#2) - I am not familiar with the unit in question
That being said, if the jumpers are near the EPROM, they might be used to
set different versions of software.
I used to work with embedded systems with different and concurrent hardware
versions and it was easier to have a single 64KB EPROM and run four
different versions of a 16KB app. By jumpering the high bits of the address
line, you could have the first version live in the 0-16KB block, the second
version live in the 16KB-32KB block, etc.
Kept parts count down and made updates simple. This may be the case here
but your mileage may vary...
Dave
> -----Original Message-----
> From: volt-nuts-bounces at febo.com
> [mailto:volt-nuts-bounces at febo.com] On Behalf Of J. L. Trantham
> Sent: Monday, June 25, 2012 17:54
> To: 'Discussion of precise voltage measurement'
> Subject: Re: [volt-nuts] 7061 On Board Clock and Battery
>
> OK!
>
> Now I understand. On my unit, SP1 is soldered 'closed'. SP2
> is 'open'.
>
> As I said earlier, I have the 'AA' version of the Floating
> firmware with
> TMS2516-45JL chips that have 24 pins. They are on the PCB
> 70610505Y F board
> which I interpret to be the 'Revision F' board. There is
> room for a 28 pin
> socket. I wonder if it would be possible to modify my board
> for the 28 pin
> EPROM's?
>
> I would be interested in knowing what board the 2764 chips are on.
>
> Thanks.
>
> Joe
>
> -----Original Message-----
> From: volt-nuts-bounces at febo.com
> [mailto:volt-nuts-bounces at febo.com] On
> Behalf Of Fabio Eboli
> Sent: Monday, June 25, 2012 5:03 PM
> To: Discussion of precise voltage measurement
> Subject: Re: [volt-nuts] 7061 On Board Clock and Battery
>
> >> I don't understand 'SP1 and SP2 on floating board are both
> open circuit'.
> >> To what does this refer?
> >
> > In this photo...
>
> ... the photo :)
>
> http://www.flickr.com/photos/14336723@N08/7443455140/
>
> Fabio.
>
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