[sdiy] Analysis of the TB-303 CPU timing

[Magnus Danielson]

Hi,

On 03/19/2017 10:01 AM, rsdio at audiobanshee.com wrote:
> Does anyone have a link to a binary image of the 303 ROM? I can handle the disassembly myself, if that's not also available, but I primarily want the masked ROM data.

It was not too hard to locate and then disassembly was not too hard, I 
defined the processor for my disassembly tool so out came the code.
The big job now is to interpret it and decorate it with labels.

As for timing, it is apparent that the interrupt routine varies in delay 
depending on what it does.

Cheers,
Magnus

> Thanks,
>
> Brian
>
>
> On Mar 16, 2017, at 7:45 AM, Colin f <colin at colinfraser.com> wrote:
>> If you really want to know what goes on in the 303 CPU, the original mask ROM seems to have been extracted, and there is code from the MAME base to emulate the CPU.
>
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