25 Feb
2010
25 Feb
'10
7:18 a.m.
> Fired it up, seems to work for capturing sine
wave from finger on input. Still
> have to figure out some of the functions. I take it the 1H, 2H, 1Q, 2Q, etc.
> modes are for recording in interleaved halves or quarters of memory? Do you
> know if the SUB function subtracts a new sweep from the currently active
> memory, or does it operate on two portions of already-recorded memory?
It processes data in menory. Which it uses depends on
where the memory switch
is. It also records the two input channels in the two halves when the memory
is set to all.
The following are valid memory settings for subraction:
Q3 Q1-Q3 into Q3
Q2 Q4-Q2 into Q2
Q4 Q2-Q4 into Q4
H1 H2-H1 into H1
H2 H1-H2 into H2
All No effect
The memory is 4K total. Each quarter is 1K. When recodrding
differential, one channel goes to H1 and the other H2 with
All set.
The invert allows one to add to by first inverting and then
subracted.
Thanks, all that will give me a little more direction when I try playing with
it next.
I know they're are some functions listed I'm forgetting right now.
With the disk system that mine has, I can recall
previous
recodered results and do math on them.
The one thing I found offensive has to do with the Pin operation.
This sends the screen info to a XY plotter. The problem I found
is that in order to use the memory effectively in XY mode for
my analog computer, I need to do sparce sampling. When doing
the pen mode, it does a square move from dot to dot. In other
words, it does the move in one axis and then moves in the other axis.
For the sparce sampling that I have it make the plotting
worthless. I'd have thought that with the 2901's, it could
have done the math to draw lines between the dot.
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.