[sdiy] bizarre Prophet 600 LFO solved..I hope...

[Bob Weigel]

THE REAL PROBLEM...appears to have been (don't discount obscure random 
simultaneous anomalies..that seem to plague me through the years..lol)  
the cpu.

Just cooling the cpu a few degrees in temperature.  Very strange.  So 
apparently something....like it can't decrement consistently?  ayieeee.  
Anyway I can consistently cool it down and the problem goes 
away..gradually warms up and the lfo gradually goes to bunk.  When I was 
observing briefly the issue with the frequency not being able to 
change... I think that might have been dirty selector switch.  Cleaned 
that up and that issue went away.  Anyway

Ok... I have the eprom revision document that was on notelt's site.  It 
claims 0_4 is the first rev issued.  The manual seems to indicate 
however that there was a rev 0.2 they were saying to put in.  My chip 
was a 0.1 in number 512.  Does anyone know how many of these were 
produced?  I'm guessing maybe 7 or so thousand from serials I've seen. 
This number 5679 anyway I think it is had the rare eprom with a defect 
notelt's note said.

Anyway if anyone can tell me what the problem is with 0_7... 'error in 
the operating system'.  I haven't been able to get it to mess up any 
other way.  Would appreciate knowing if I need to burn another one. If 
greg or someone has the code for 0_8 handy that'd be swell. Otherwise I 
can open the other one I have here and burn a copy to replace the 
defective one. -Bob