[sdiy] Odp: Re: Analysis of the TB-303 CPU timing

[Colin f]

> -----Original Message-----
> From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of
> rsdio at audiobanshee.com
> Sent: 20 March 2017 10:50
> To: Synth DIY <synth-diy at synth-diy.org>
> Subject: Re: [sdiy] Odp: Re: Analysis of the TB-303 CPU timing

> The mask ROM has address decoding and
> connections to all of the bit cells, just like a microscopic printed circuit board,
> but I doubt that the contents of the bit cells are visibly readable in any
> reliable way.

The contents of a  mask ROM are programmed into the very topmost metal mask layer, and are readable manually, or using image analysis tools you can find on the web.
The 303 mask ROM has already been read, so no need to reinvent the wheel !

Cheers,
Colin f