93 Z disassembly - I have jsrs to non prom location.

[Roger Heflin]

Thanks.  That does match the kind of addresses I am seeing. 

				Roger

On Thu, 14 Jan 1999, Robert W. Hughes wrote:

> >  I did find some odd code that does jsr into the $5000 range,
> > the prom is mapped from $8000-$FFFF, so $5000 would have to be
> > built into the computer's internals.    There about 10 of these jsrs
> > to different addresses in the $5000 range. 
> 
> GM had a diagnostic device that apparently allowed monitoring and
> controlling/changing operation of the ECM for development purposes. It
> mapped itself into the $5000 range when plugged in. There should be
> several places in your software where a set of locations in the $5000
> area is checked for a specific set of values and if found jmp/jsr
> transfers are then made to this area. These addresses show at $5800 and
> above in my ECM (7170)
> -- 
> Robert W. Hughes (Bob)
> BackYard Engineering
> Houston, Texas
> rwhughe at hal-pc.org
>