The Minolta 3600 HS(d), to give it it's full name, will work fine on an A330 hot shoe.
It can also be used off camera, with the pop-up flash acting as an optical trigger when your A330 is set to 'wireless' flash.
In this mode, the pop up flash fires a series of very short pulses of light, which instruct the off-camera 3600 hs(d) to fire, and at what power.
The disadvantages of using this optical triggering method are;
1) The remote (off-camera) flash must be able to 'see' the controlling trigger pulses - often this means a direct unobstructed line from camera to flash, but you can sometimes get away with 'bouncing' them off a wall / ceiling .
2) Relatively short range - I'm not sure of the actual range, but probably you want to be within 10'-15'.
3) The pop-up flash will also give a (small) contribution to the final exposure - often this is not a problem, but can sometimes result in an unwanted bright spot from it's reflection.
On the plus side, it's 100% compatible, and you need no additional pieces of kit to make it work - while finding a good set of remote radio triggers for the older iISO hot shoe that the A330 (and my A900's) have can be expensive (I use pixel Kings, but you'll have a job finding a set these days).