Re[2]: Sumcheck Error with Star Wars mathbox proms

-----Original Message-----
From: "Andreas Kraemer" <andi_kraemer@t-online.de>
To: <vectorlist@vectorlist.org>
Date: 18 Sep 2008 06:08 GMT
Subject: Re: VECTOR: Sumcheck Error with Star Wars mathbox proms

> Just by chance I discovered the same two days ago when trying to load the images
> from MAME and I think the contents from ionpool had the same issue...
>
> Luckily the problem on my SW wasn't any of the mathbox PROMs. So I read them on
> my Data I/O 29B - Unipak 2B :-) Then saved them as a file and loaded them one back
> onto the programmer without a checksum error. Additionally I burned the -110 PROM
> newly (Harris 7643, cross to 82S137) and it worked like a charm. So I expect the files
> to be ok.
>

you need to be real carefull with proms in mame,
some 4bit proms have been dumped as 8bit with a leading or trailing nibble of crap by people using eprom readers & home-made adapters.

i tried to correct some once but some asshole on the "team" just rejected the change claiming some rubish about how "that's still how a lot of people dump them".
that may be true - that's how i used to before i had a decent programmer.
but i had the decency to take the junk out with a hex-editor before spreading them!

so if using mame prom-files, check the file-length against the prom before you commit the data with the program option.
it may save some proms from the bin!

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Received on Sat Sep 20 05:56:47 2008