MC3418 CVSD Encoding (Was: Re: Looking for IBM PS/2 or PCjr Speech Adapter Tech Ref

[Michael B. Brutman]

Michael B. Brutman wrote:
> 
> The PCjr Speech Adapter sidecar is rumored to be identical to the PS/2 
> version, at least as far as the BIOS support on the adapter goes.
> 

Ok - it looks like nobody has ready access to a tech ref for the PCjr 
version or the PS/2 version of the speech adapter.  I am sure its buried 
in a nice binder with a slipcover somewhere but I don't have the PS/2 
set - I only have the PC family set of docs and they didn't make one of 
these for the PC or XT.

The part of the adapter I'm interested in is driven by a MC3418.  This 
chip does CVSD encoding and decoding of waveforms.  I understand the 
principle behind CVSD encoding and decoding, but not enough to start 
writing code.  I want to write some code takes CVSD encoded data and 
displays the waveform on a screen, for a sound editor.  Does anybody 
have any experience reading MC3418 encoded data?


Thanks,
Mike