Assembler Guru's.

[Ludis Langens]

Ross Myers wrote:
> 
> Been flicking through the code of some Holden stuff lately, and came across
> the following, can any of you figure what this maybe used for, This code
> structure continues for a fair while and occasionally jumps to some other
> running code at $5xxx. An example -
>[...]
> 183C STAA  $0488

It is obviously collecting together boolean flags from various scattered
locations.  This could be for an output port, or maybe for an ALDL
status byte.  What is at location $0488?  If nothing, it might be meant
for use during engine calibration.  A set of 8 LEDs might be driven from
a port placed at that location.

What is at $5xxx in your ECM?  Is that in your 64Kbyte EPROM?  In many
ECMs, that address range is GM's favorite place to hook in their
development tools.

-- 
Ludis Langens                               ludis (at) cruzers (dot) com
Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/