I didn't have the time to study my 7061 enough.
I just gave an eye to the pcb's:
The earthy logic has this sticker:
PCB 70610513A
main firmware memories are D27C256D-15 the revision is AB
floating logic pcb is 70610515X B
SP1 selects 2716 memories
SP2 selects 2732/64 memories
on the pcb there is also an hand written sticker : ST/255/34 A0011
The memories on floating board are 4 M5L2764 k-2 with FW revision CA
As I understand these memories don't contain executable
code but data bit patterns used to command various signals needed
for the measurements setup.
The SP1/SP2 selects the address line A11 on the memories for +5V
or Ground, so one of the two has to be shorted.
It's strange that mine are both disconnected, it isnt ok leaving
the address line disconnected. When I have time I must indagate better.
Fabio.
"J. L. Trantham" <jlt...@att.net> ha scritto:
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-boun...@febo.com [mailto:volt-nuts-boun...@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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