ALDL 160 --> 8,192 baud conversion?

[Tom Hussey]

While I can't answer your question directly, here is some info about the
chip used to drive the 8192 stream on a '97 Camaro...I suspect it might
be the same.

The Serial Transmitter/Receiver IC (SXR) is a 28 pin Jlead quad marked
70366U87 12317 466 DE. The chip takes the serial I/O pins from port D of
the 68HC11F1 plus one control port signal as input. The chip buffers and
isolates the microcontroller from ESD, overvoltage and other unpleasant
electrical conditions. In addition the chip limits the slew rate of the
output to control RFI. There is limited info on this part at

http://www.delco.com/index.cfm?location=517

Hope this helps...

-Tom 

Peter Gargano wrote:
> 
> I understand that it's possible to upgrade the '808/'277 by
> adding the high speed ALDL 28 pin chip (U2). I even recall
> that one (re)manufacturer adds this chip and changes the
> firmware (PROM) to make use of the 8192 baud data stream
> (so their data acquisition software has a chance of capturing
> data at a reasonable speed).
> 
> What is this 28 pin chip? Can I get it from a chip manufacturer?
> Is it a UART or a level converter chip (or both) for true RS232?
> 
> Ludis Langens wrote (Re: SERVICE NO. 1227277 1.8L AUT TBI 16059788
> BZY):
> 
> > [snip] ...  Your '7277 is
> > missing the O2 amplifier (20 pin chip) and the high speed ALDL
> > driver/receiver (28 pin chip). The '7165 has both.  I'm told the
> '7808
> > is missing just the ALDL chip.  ... [snip]
> 
> TIA, regards,
> --
> Peter Gargano, Tech Edge Pty Ltd.,  mailto:peter at mail.techedge.com.au
> Ph: +61 2 6251 5519,   Fax: +61 2 6251 6646,   mobile: +61 15 289 172