26 Feb
2010
26 Feb
'10
5:38 a.m.
From: hilpert at cs.ubc.ca
dwight elvey wrote:
Yes, this is what I was guessing. Did you get the manual with yours?
I should go back and open up the 1090, the model from 6 or so years earlier,
IIRC it had an 8080 in there, don't remember if there were any 2901's.
Hi
I'm not sure if a 8080 could keep up with what the 2901s do. I have
an 1174 averager that also uses 2901s. I think the fellows at Nicolet
liked them.
I have an original copy of the service manual and a copy of the instruction
manual. Each of the 2 cost as much as the scope cost me but it
isn't as much as some of the charges I've seen on the web.
I fixed the capacitors before I got the manuals but I wanted to
be able to deal with calibration as well as have the GPIB instruction.
I have these now.
dwight
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From:
hilpert at cs.ubc.ca
I think they're were some PROM's in there, so it may be a programmed state
machine, but probably not much memory available considering everything else it
is doing.
The PROMs are for the 2901s. These do the things like the subtraction, inversion,
autocenter and run the display. Things like the digital numbers at the bottom
of the screen are all created by the 2901s. Remember, as a DSO, the data
is sampled and then put into the RAM. The 2901s then determine what
to do with that data on the screen. The PROMs have the instructions for
the 2901s to use.