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Digital grounds were also used for the voltage rails, though in implementation, all audio and all digital grounds were typically tied together. Each audio channel had its own ground, and each digital signal had its own ground. Interfacing through the 26 pin connector was achieved via a standardised interface, modeled after Creative's WaveTable, which only used 12 of the connectors: +5V, +12V, -12V, TTL-MIDI in/out, Audio R in/out, Audio L in/out, !Reset, digital ground and analog ground. CPUs, of course, had no such limitation and could usually handle 100-400 voice polyphony by the time we reached 200 MHz or so. 512 kB to 1 MB and 32 voice polyphony was about standard for the era. Avance offered its own PRO32AW model, which had an AdMOS QDSP QS1000 and half a megabyte of ROM. The header at the top is for a WaveTable card, often branced as "WaveBlaster", which was a small DSP and EEPROM containing samples. Some handled crude MIDI synthesis but most were just employed as nothing more than what our onboard AC'97s do. This card is about on par with the Soundblaster16.īack then all the sound card was was a codec (encoder/decoder) to convert digital PCM data to analog audio and back again. This is associated with the amplifier, and this card wasn't used with the amplifier active. It also can be seen that an electrolytic capacitor has broken from the card in position C31. Sound cards of the day offered the ability to connect a CD-ROM drive, as onboard ATA ports often didn't support ASPI for removable drives. The ALS120 IC does have an IDE interface on board, but it is unimplemented on this card, seen by the number of floating pins on the SM-PLCC package. Sound cards were expected to be able to drive small passive speakers, and this one had jumpers to configure the speaker out between a powered speaker out and a line-level output, for speakers with their own amplifier. The DIP package is a UTC TEA2025 series dual 5W audio amplifier ( which can be reused as a portable amplifier!). Pretty much average, it is what a sound card had to be back then, a DAC (for output), an ADC (for recording) in full-duplex (able to do both at the same time) which is software based unless the Wavetable card is attached. A budget level ISA sound card from many years ago.
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