[sdiy] Digital Waveshape Generator.

[Phillip Harbison]

Chris McDowell wrote:
> My gut immediately says there are very good ways to do this without
> all of the hardware digital logic (depends on your goal, of course).

That all fit on a 4"x4" protoboard including the multiplying DAC that
is mentioned in the design doc but not in the diagram. I intended to
use the multiplying DAC to implement the equivalent of an envelope 
generator and VCA. A bunch of these minus DACS would fit in an FPGA.

I guess the main question I have is does it make sense to have all this 
waveshape precision when a 44 kHz sample rate captures music with a 
level of fidelity I think most people find acceptable if not ideal.

> If you were trying to make this into a product in 2025, I think you'd
> pick a fast microcontroller and do all of this monkey business in
> code, accepting the tradeoffs we're all familiar with.

Microprocessors available in 1980 on a student budget:
6502
6800/6801/6809
8080/8085
Z80

The 68000, 8086/88, and Z8000 were available but expensive. Today I
would probably go with the ARM chips used by Arduino.

Thanks for your input.

-- 
Phil Harbison