5 Aug
2001
5 Aug
'01
9:07 p.m.
At 07:22 PM 8/5/01 +0100, you wrote:
Mountain Hardware Supertalker. Some kind of voice I/O
card. There are 2
3.5mm jhackl sockets (what you'd call mini phone jacks :-)) on it, one
labelled 'microphone input', the other 'speaker output'. It contains a
couple of 324 quad op-amps, an LM380 audio amplifier, a small-ish PROM
(256 bytes, I think), TTL and 4000 series CMOS logic, and a MC3418 (is
that some kind of Codec?)
MC3418 is a "Continuously variable slope Delta Modulator / demodulator"
"Providing a simplified approach to digital speech encoding / decoding ..."
http://www.spies.com/arcade/schematics/DataSheets/MC3418.pdf
there's the PDF of the datasheet for it.
and here's a URL for a bunch of datasheets on common IC's used in arcade
machines...
http://www.spies.com/arcade/schematics/