understanding some terms and theory (re wavetables)

[Paul Maddox]

Jorgen,

  I've looked at the data on the eproms... there are 2 proms with "sound 
data" on. one of which has 127 half waves samples (8 bit wide) the rest 
is "rubbish", what I suspect is that the "rubbish" is a look up table or 
some kind of mathmetical function for the thing to process it.

  64 cycles per wave * 32 waves in a table * 32 tables this is 64k Byte 
(8 bits) which in those days was a LOT of eprom (512k).

  I dont know for certain how the PPG worked, there are no clear 
descriptions anywhere, waldorf wont say, wolfgang palm cant be found 
(i've not found him, yet) and no-one else knows.. I have the schematics 
for the PPG BUT it doesn't include one of the main logic boards, which 
is a REAL pain in the butt. it has a block diagram a PCB layout, no 
chipnumbers, no schematic.

  If someone knows, please help.

  Paul



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