FAQ

frequently asked questions

Software Hardware

Question: As soon as I try to play something via the Prelude all I get is noise. What's the problem?
Answer: Data transfer between your Amiga and the Prelude is done in large blocks to minimize CPU load. However, some systems can't handle the default blocksize properly. Please select Edit->SMALL IRQ from the Mixer's menu and save the new settings with Project->Save.
Question: Which sampling rates can be used with the prelude?
Answer: The soundchip used on the Prelude Z-II/1200 has two high accuracy programmable crystal oscillators. It can generate all common sampling rates from 5 kHz up to 64 kHz. The internal active filters will eliminate aliasing effects according to the currently selected sampling rate to give you distortion-free recordings. A digital oversampling filter takes care of crystal clear playback.
Question: How do I know if my A1200 has a clock port at all? I've been told some don't have one.
Answer: To the right of your harddrive carrier there's a lid, about 3 by 2 inches in size. If you remove that lid you can see the motherboard as in the left hand picture below. The clock port consists of two 40pin connectors but not all of them are commonly soldered in place. However, all you need for the Prelude 1200 are the rightmost 22 pins of the bottom connector (two rows with eleven pins each) like shown in the right hand picture. If these pins are there, you can use the Prelude 1200 in your A1200's clock port.

clockport1 clockport2

Question: Why only 16 bits resolution although current highend sound systems are moving towards 20 or even 24 bits?
Answer: More than 16 bits resolution only make sense for professional use but a professional card doesn't make sense in an A1200 clockport.
Question: What are the capabilities of the Chrystal soundchip!?
Answer: Chrystal The CS4231A from Crystal is a combined encoder, decoder and mixer (CODEC) especially designed for high quality computer soundcards and can be found on the Terratec Maestro boards for example. It has all the needed filters and a high accuracy voltage reference already built in. Additional filters on the Prelude1200/Z-II board keep the noise down even further. Two separate FIFOs for record and playback allow reliable full duplex operation at low system load.

If you have any question regarding the prelude soundcards or add-ons please use this form to make an addition.


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