Re: Example code for Calculating CRC32 on the Fluke 9100

I know this is going back a bit, but cheers for this Andy / Chris!

I finally got round to rigging my test setup back up tonight to
explore the 9100 a bit. Of course the first thing I do is go to check
out some ROMs on a board and find nothing checks out. Then I remember
your comments about the 9100 and 9010 sigs not being compatible (what
a pain is that!!??) and I came back here.

It's taken me a long while to fill in the missing bits of the program
since I hadn't yet got as far as the TL1 manual but I've got it
working now and see this as a good way to verify known ROMs against
mame. Once I know they're good against mame then I can learn the sigs
on the 9100's native checks and store them for later use.

Good stuff - thanks.

Martin.

On 15 Dec 2007, at 23:59, Andy Welburn wrote:

> hi all.
>
> Well, after running into this on more than one occasion, i decided
> to do something about it, you know when you have soldered-in roms on
> a game pcb and you don't have any 'good' signatures for that rom in
> particular? Don't want to have to desolder the rom? Don't have a
> reader capable of reading that funky rom? Still want to check the
> roms contents with a known good dump?
>
> I'm working on an Atari Sprint 2 pcb right now with just such a
> problem, after building an adapter to replace the 2k*8 PROM soldered-
> in with a 2716, i could then verify that i did have a bad prom
> there, and subsequently managed to verify all other roms by burning
> a bunch of 2716's with mame code and verifying sigs taken from the
> real roms in place against the known good 2716... However, while
> doing this, i pestered a few peopel into trying to crack the fluke
> 9100 signature calculation routine so that i could run it on mame
> roms and verify on the fluke itself. This is no easy task and i've
> been asking around for this for a while now... so i gave up, and
> thought to myself it would be great if i could calculate a reliable
> signature on the 9100 that is easily calculated on the pc on mame
> roms...
>
> Well then CRC32 is an answer to this, MAME carries CRC32's of all
> the roms it uses in all its game drivers, an excellent source of
> known-good sigs!
>
> With the help of Chris Hardy - who found this small CRC calculator
> code online - it looked like it could be converted for TL/1 use:
> http://www.di-mgt.com.au/crypto.html#CRC
>
> My C programming skills are very rusty, and it saved me a lot of
> time talking to Chris to just check on the meanings of the C
> statements in this CRC calculator code... Once Chris explained some
> of it to me in English, it helped me to translate it to what i know
> of TL/1...
>
> and here's the result of equivalent code :
> http://www.andysarcade.net/pix/DSC_2380.JPG
>
> (full program code omitted, but if you know TL/1 you know the meat
> and potatoes is in the middle bit - so long as you declare numeric
> crc=$FFFFFFFF, numeric temp, numeric j, numeric octets at the top)
>
> I'm no rocket-scientist, but i stuck this in my PROGLIB and it'll
> now be available to all my other UUT programs :) Its not tidy code,
> its not the quickest or most efficient, but it works... If you can
> suggest a better way of doing it, then please do expand on this if
> you can!
>
> I'm interested to hear who is actually actively programming on the
> 9100, is it just me all on my own?? I know a few people who own the
> 9100 units, but i'm the only one amongst them that seems to be using
> the editing suite... Whats the situation with you lot here on the
> list? A show of hands would be nice to see...
>
> Maybe we can pool resources and swap code snippets? I have hundreds
> of rom sigs and a growing collection of programs i have written, I
> understand anyones reluctance to give this info up for free (i have
> certainly put in a considerable amount of time on the fluke) so i'm
> looking to trade info with other people if anyone needs it?
> Personally i'm not after much info myself, but i'm always keen to
> add to my own knowledge base, and i don't mind helping others out
> with programming, and advice on the pitfalls of bugs in TL/1 etc.. :-)
>
> Of course, I could be delusional and I really am the only one doing
> any programming with it...
>
> so speak up!
>
> Andy Welburn
> http://www.andys-arcade.com
>
> _______________________________________________
> Techtoolslist mailing list
> Techtoolslist@flippers.com
> http://seven.pairlist.net/mailman/listinfo/techtoolslist

_______________________________________________
Techtoolslist mailing list
Techtoolslist@flippers.com
http://seven.pairlist.net/mailman/listinfo/techtoolslist
Received on Wed Mar 5 20:18:47 2008