[sdiy] Anybody using Atmel AVR?

[David J. Hughes]

John,

on 22/12/04 3:24 AM, john mahoney at jmahoney at gate.net wrote:

>> Now for a real challenge,  what can you do with a 6502?   :-)
> 
> The 6502 might be capable of wavetable fun by virtue of its "Indexed
> Indirect" addressing mode. Or maybe the "Indirect Indexed" mode. The 6502
> has both modes and I forget which is which.

I used an over-clocked military grade 6502 running at 4MHz to create a pair
of digital oscillators using an eight-bit DAC. It was fairly impressive -
normal wavetable, PPG-style wave-sweeps, a crude version of FM/phase
distortion, ring modulation (after a fashion) plus 128K sampling.

The bandwidth wasn't brilliant - 32kHz - but it worked and I still wish I'd
pushed it harder than I did. Might have given Maddox's Monowave a run for
it's money!

Might dig out the code over the holidays and see if it will port to a
Mega128.

Regards
    David

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