25 Feb
2010
25 Feb
'10
5:24 p.m.
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.
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.