Rossler oscillator overflows above 1283 Hz

[graue]

The Rossler oscillator in rossler.c overflows, becoming +Inf almost immediately if the frequency is 1284 Hz or above (at a sample rate of 44.1 KHz).

I don't understand the math behind this oscillator; I think I merely implemented the algorithm from this example by Russell Borogove. So it's not yet clear to me how best to fix this problem, short of something like oversampling 16x (which would push the offending frequency up to 20544 Hz).