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

[martin at guddler.co.uk]

I'd love to be programming a 9100 but every time I've tried to pick  
one up in the past there has always seemed to be a dozen or so other  
people after it and they've all gone for silly money! The ironic thing  
is that it's a bit like the 9010's. Most of the people that end up  
chasing after them in the UK are after them simply because they've  
heard it's some magic PCB fixing tool and when it boils down to it,  
really don't have a clue how to use one when they've actually got the  
damn thing!!

It's a real shame too since all my gear is packed away at the moment  
so I would have plenty of time to be tinkering about with one.

If anyone knows of a sensibly priced 9100 setup going begging in the  
UK then I'd be very interested in a deal on one.

On the CRC32 checking itself Andy, are 9100 sigs different to 9010  
sigs? On the 9010 I would have used FIDE to generate sigs from the  
mame roms and read them that way in situ. I'm assuming the 9100 sigs  
must be different though? I might have a better read up on the 9100  
later. Being a programmer I do find it pretty interesting :o)

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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