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

[Ward Spoonemore]

The JRS are to the GM heads up algo that is used to create 
to original factory cailb. GM'ers call this the "heads up system"
Ward Spoonemore

-----Original Message-----
From: owner-diy_efi at efi332.eng.ohio-state.edu
[mailto:owner-diy_efi at efi332.eng.ohio-state.edu]On Behalf Of Mike Pitts
Sent: Thursday, January 14, 1999 4:54 AM
To: diy_efi at efi332.eng.ohio-state.edu
Subject: Re: 93 Z disassembly - I have jsrs to non prom location.



My guess is that the JSR's into the $5000 locations are used 
for test equipment.  Is there a check for a particular word at $5000 
which sets a bit if present?   Then if the bit is set the routines are 
called?  Normally, the equipment isn't present so the routines are 
never called.

The TCC in my 93 is activated by setting a PWM output (at $306A) 
to 100% DC.

-Mike
==========================================
Mike Pitts
Delray Beach, FL
mpitts at emi.net
==========================================
-----Original Message-----
From: Roger Heflin <rah at horizon.hit.net>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Wednesday, January 13, 1999 11:52 PM
Subject: 93 Z disassembly - I have jsrs to non prom location.


>Hey,
>
>I have finished the TCC control routine, and I think I understand
>all of it, except how the TCC actually gets triggered.  There aren't
>any things checking the TCC bit and setting a register in the $1000
>range.   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.  Does anyone have any
>idea what these do?   If I really want to know bad, I will setup
>a prom to read that range (while petting the watchdog), and output
>that data to the aldl port.  I am thinking some of the hardware
>operations (TCC and several others maybe) are being done there.
>
> Roger
>