Delco 27474 DSNEF info?

[Peter Gargano]

I'm looking at a couple of GM ECMs (PCB ID=168509 and 200727 - these
two PCBs may be present in many different GM ECM/PCMs).

They both have 27474 ICs that have been described as Digital Signal
to Noise Enhancement Filters and are briefly described here:

  http://www.iseebank.com/catalogue_data/delphi_microsystems/Product%20Technologies.htm
  http://www.delphiauto.com/pdf/delcopdfs/DSNEF.pdf

and apparently in US Patent 5,594,649 at:

  http://swpat.ffii.org/vreji/pikta/txt/ep/0718/611/abstract.html

which makes reference to a Harris (now Intersil) chip  - perhaps
the HIP 9010 described at:

  http://www.intersil.com/data/fn/fn3/fn3601/

I'm interested in sharing any knowledge anyone has of the 27474 chips
(sorry in advance for the cross posting).

Peter.
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