Albrecht Computer Technik Prelude - Amiga Hardware Database

Company Albrecht Computer Technik, Germany	Date 1997	Amiga A2000, A3000, A4000	Interface Zorro II	Autoconfig ID 16945 / 1

Company

Albrecht Computer Technik, Germany

Date

1997

Amiga

A2000, A3000, A4000

Interface

Zorro II

Autoconfig ID

16945 / 1

Crystal Semiconductor Sound Codec 4231A

5510-64000 Hz frequency range
ALaw, uLaw, ADPCM compression / decompression
MPC Level 2 compatible mixer
dual DMA registers support full duplex operation
two onchip FIFO buffers for higher performance
selectable Serial Audio Data Port
two channel simultaneous playback (simple stereo signal)
unlike a DSP, this chip is designed solely for handling audio, it cannot for example, off-load your CPU when playing back an 8+ channel ScreamTracker file

connectors

LINE
- can be routed to the ADC and to the onboard mixer
- normally used for recording line level signals
MIC
- can only be routed to the ADC, not to the mixer
- used for recording only - signal may be line or mic level
AUX1
- can be routed to the ADC and the onboard mixer
- used for recording or mixing the audio output of a CD-ROM drive or the MPEGit MPEG audio decoder expansion module
AUX2
- can only be routed to the mixer - cannot be used for recording
- recommended for mixing with the Amiga output
- after a reset when the card is not initialized by the mixer program, LINE out is muted and the source connected to AUX2 can only be sent to the mono output
OUT
- goes to stereo system

notes

15 pin D-SUB connector for the customizable adaptor - when ordering, the type of connector can be chosen for each input (e.g. RCA, 1/4" phone plug , 1/8" phone plug
mixing means that the signal of that input can be mixed to the output along with other inputs, and the sound generated by the codec itself
recording means direct recording to RAM or hard disk from that input and also using it for digital realtime effects
40 pin (male) expansion bus connector for expansion modules
- Rombler - wavetable / MIDI interface
- MPEG-it! - MPEG audio decoder supporting Layer II & III streams
- Arpeggiator - digital input / output (S/P-DIF) for DAT, CD, MiniDisc, etc.
full duplex 16 bit audio sampling, mixing and playback
sampling and playback rates up to 64 kHz even on 68000
EMI filtering and double surge protection

software

Realtime F/X; u-law, A-law, ADPCM encoder / decoder; Surround Decoder; Mixer (adjusts the level of each input); tapedeck (recording one of three inputs at a time); Dub! full duplex recorder (record and playback a file at the same time); AHI
optional Samplitude 3.0 or AudioLab16
AHI driver

front side

back side