So far, I have been able to produce tones over the IO port by toggling bit 4/5 of port B (7720 specs).  Does anyone know how the Prizm's OS does it?  I have tried the DAC hardware, but it isn't present, as well as the SIOF hardware, but wasn't responding.  I can replicate what the prizm OS puts out from using Send(, but it doesn't seem right.  I have been analyzing the output waves, but again, it looks like the OS has a tad more control.  For example, writing to that port only outputs adds/subtracts voltage from the port.  I don't know how best to explain, other than:

Code: [Select]

H - reset, add
L - set, subtract
... - wait, equal time
() - level from -1.0 ... 1.0

(0) ... (0) ... H ... (1.0) ... (0.9) ... (0.75) ... L ... (-.25) ... (-.22) ... (-.20) ... H ... (.8) ... (.65) ... (.55) ... L ... (.45)
I could get in an image of my recording of it, but the above shows that it discharges inversely to 0 and writing to the ports doesn't set it, it just offsets it.  When looking at the OS's IO output, it seems like it has analog control over it.  It can keep the signal low or at an exact position, for ex..  If I am not making sense, :-S  Fill me in on terminology :-)

So far, everything that I recorded included both channels, that includes what I have done and what the OS has done.  The last posts that I read about IO stuffs were from the middle of last year.  Also, if there's a topic on disassembling the Prizm OS, then let me know as that could greatly help me as I can see what the OS does :-)

See fx_calculators_SuperH_based_10.chm
(http://ourl.ca/8207/238670).

Try topic: fx-CG20...Registers, MPU...Accessing the 3pin serial lines directly

That's what I found.

WB Simon! Are you going to port insight to prizm?

...Do you plan any update of your documents / SDK?