[Techtoolslist] Example code for Calculating CRC32 on the Fluke 9100

[martin at guddler.co.uk]

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

>

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