Re: Ambidextrous software

[thergen@svn.net]

I think one of the failure modes of the old bipolar proms was for a fuse
to "heal" itself after being programmed (fusible link blown).  If you can
find some old datasheets on the prom and determine whether the
unprogrammed state is a one or zero, this may give a clue as to what the
bit should be.

hth,
Tom

On Sun, 2 Jul 2000, Ludis Langens wrote:

> I've been reading a huge backlog of fresh PROMs.  Doing this, I found a
> new software ID that supports two ECMs with dissimilar hardware.  The ID
> byte is 107 (or $6B).  I have two MEMCALs with this version of software.
>  Both are for the 2.3 liter Quad 4 engine (code LD2).  ARHM6030 is for a
> 1988 N-body using the 1227749 ECM.  ARPZ6720 is for a 1989 with the
> 1228707 ECM.  The '8707 adds an extra SOIC device to what the '7749
> contains.  Either this IC doesn't do much, or the version 107 software
> has a mode flag to support both hardware configurations.
> 
> 
> Also while reading all the fresh PROMs, I found an old 1Kbyte bipolar
> PROM with a single bit error.  Actually, I have two PROMs with the same
> BCC but with a single bit difference between them.  These old PROMs
> don't seem to have a sumcheck of any sort, so I can't determine which
> one is the correct one.
> 
> -- 
> Ludis Langens                               ludis (at) cruzers (dot) com
> Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/
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