Thanks, I'll see about trying this out. Are there any wave editors
that are freeware that you'd suggest (a guy can hope, anyway)? And,
please excuse my ignorance, but what would you use as an input probe
and how would this be connected to a computer - the mic jack? I've
used a "standard" oscilloscope before, but nothing like you suggested.
Thanks,
Jim Stewart
--- In Simmons_Drums@yahoogroups.com, Steve Ridley <spr@...> wrote:
>
>
> A few years ago I had a distortion problem with an SDS1000, and
> I came up with a useful trick for checking the system out.
>
> I bought a 28 pin IC socket - same size as a Simmons EPROM
> and connected 8 wires from address line A0 to data line O0,
> from A1 to O1 throught to A7 to O7. Eg, pin 10 to pin 11,
> pin 9 to pin 12 etc. The wires just push into the socket.
>
> You can get a 2764 EPROM pinout here.
>
> http://pdf1.alldatasheet.com/datasheet-pdf/view/117107/NSC/NMC2764-
2.html
>
> As the SDS1 counts through the EPROM, it counts up the data
> and you get a staircase sawtooth wave sound out. Look at the
> SDS1 output on some sort of wave editor or audio oscilloscope
> software on your PC and look for a smooth regular sawtooth
> wave with 256 steps. If you get big or uneven steps, you've
> got a faulty SDS1. (My SDS1000 turned out to have a faulty
> DAC.)
>
>
> Steve
>