A Newbie Question

[JTesta1966 at aol.com]

Hi All,

Some of you I already know from another list, and hopefully the rest of you 
wont think this as a too newbie or lamer question, despite the fact I'm on 
AOL :-P

I'm trying to learn to program some proms, I have a few hex programs, and I 
have a proprietaery program for programming 1986-87 GN proms. Thats neat, 
BUT, I'd like to find a resource on what locations mean, what purpose they 
serve, and what the common adjustments are in those locations. I'm not asking 
for any trade secrets, I just wana get an idea of whats what. I'd like to 
innovate on my own. I downloaded a stock GN prom table (its a spreadsheet in 
excel) for the GN's and while looking at the same chip in rom format in a 
typical hex editor, cant find where some of the info is, for example a 
certain address might be hi rpm cutoff..theres a hex value, and I assume at 
the end of the line a checksum value for that line? Like there might be: (I'm 
not looking at anything now, this is erroneus data)

$33F0   AA  AB AC CD EE FF CC DD-EE FF AB AC AD AE 99 F0   ..(..!.ac........

I know the first number is the base memory address, and each of the 15 values 
are a parameter till the next line which would go to $3400, but the last 
pieces of info on that like..the ...(.!..ac...... stuff..what is that? And 
what signifigance does it have? Is it that lines entry for the overall 
checksum? Maybe someone can explain that to me as well...ANYWAY..in the table 
(the spreadsheet) I have, the last entry in a line is like KMRPMHI which I've 
gathered was a GM engineer abbreviation for hi max rpm hi. Anyway...where can 
I find this info in the chip in a hex editor, or what could I open the rom or 
bin file to SEE that info. My intention is to go beyond ONLY doing Buick 
proms, but unfortunatly my knowledge is still in its infancy. Hopefully some 
of you guys/gals will be generous with your knowledge to help me learn a 
little at a time

Thank you all for your patience :-)

Jim Testa