Re: Playing samples on both new and old SIDs

From: Richard Atkinson (
Date: 2000-07-27 11:43:09

On Thu, 27 Jul 2000, Nicolas Welte wrote:

> There once was a discussion on how this works in comp.sys.cbm. Someone
> posted a disassembly from the demo Mathematica by Reflex which autodetects
> the SID type. IIRC, this works by monitoring a waveform, but I don't know
> about the details.

I have that demo, and very well it works too.

The 8580 has 'combined' waveforms that aren't in the 6581, so if you set
oscillator 3 to one of them at a slow frequency, set and reset the test
bit on that oscillator and read the oscillator 3 waveform register, the
8580 will always (deterministically) reach the same value which is
different from the 6581 value.


Richard Atkinson
Software Engineer
Tenison Technology EDA Ltd

This message was sent through the cbm-hackers mailing list.
To unsubscribe: echo unsubscribe | mail

Archive generated by hypermail 2.1.1.