Hehehe...I'm sweatin' here and you call it a good reading...:-)
Actually, there was a guy on this list attempting to do just that:
http://gerry.vanagon.com/cgi-bin/wa.exe?A2=ind0709a&L=vanagon&D=0&P=11816

I'm indeed reverse engineering it to simply fix my damned van...(and
to help other listees too). These devices are hard to find here. Take
a look here to some of my findings:
http://www.vanagonwiki.net/index.php/Second_type_of_idle_control_system

On 9/17/07, pdooley <psdooley@verizon.net> wrote:
> Ahhh, but you are trying to reverse engineer it.
> That would lead me to believe you plan on building an upgraded or perhaps
> more durable unit.
>
> Either way, please continue.  It makes for good reading:)
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
> tinker man
> Sent: Sunday, September 16, 2007 5:27 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Re: ECU firmware location
>
> You got me wrong...
> I wasn't planning to re-invent the wheel (i.e. design and build my own
> ISCU), just fix those darn (original) ECU and ISCU...
>
> On 9/15/07, pdooley <psdooley@verizon.net> wrote:
> > Sudhir, I was thinking the same thing.
> > The amount of brainwork going into this project is more than just changing
> > to MS.
> > However, if these talented individuals can design and build their own ISCU
> > to interface with the stock ECU, well that would be good for the entire
> > Vanagon community.
> >
> > -----Original Message-----
> > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
> > Sudhir Desai
> > Sent: Saturday, September 15, 2007 9:32 AM
> > To: vanagon@GERRY.VANAGON.COM
> > Subject: Re: ECU firmware location
> >
> > You could always install a Megasquirt, and not have to worry about any
> > of this. :D
> >
> > Sudhir
> >
> > On 9/15/07, tinker man <tinkerman007@gmail.com> wrote:
> > > Hi all,
> > >
> > > This is kinda getting in-depth into embedded systems design, but does
> > > anybody know if the firmware for our ECU's (Digifant or Digijet)
> > > resides completely on the 2732 EPROM or is part of it contained also
> > > INSIDE the microcontroller itself?
> > > The reason I'm asking this is because I suspect I have a fried
> > > microcontroller (Intel 8049H) but if it's a custom version with
> > > protected firmware inside, replacing it won't solve the problem. My
> > > CPU reads:
> > > MAF 8049H P A167
> > > 078801
> > > DSD8905V5 U
> > > WBX82HSCH
> > > (C) INTEL 1977
> > >
> > > That WBX82HSCH stuff seems to hint it's a custom version
> > > (WBX=WaterBoxer) with protected firmware, with some of the firmware
> > > also outside in the external EPROM.
> > > Any guru's out there?
> > >
> > > Cheers,
> > > TM
> > >
> >
>
>